                                                              TM
                                      di g i ta l
                           DIGITAL EQUIPMENT CORPORATION
                                MAYNARD, MASSACHUSETTS
PRODUCT SPECIFICATION                                                                DATE: 17 JANUARY 90
TITLE:          LK401 Keyboard




Document Approval and Date:
Engineer                                                                                         Release Date
Ernest Souliere                                                                                  17 January 90

Document Revision History:
Approval Name                           ECO No.              Doc. R ev.                         Approval Date
Initial                                                       B                                   12 Dec. 90




This document contains confidential proprietary information of DEC. This information shall not be disclosed
to persons outside the employ of DEC, except by DEC personnel so authorized by DEC, and only for use by such
other persons in the design, production or manufacture of products or DEC.


(c) DIGITAL EQUIPMENT CORPORATION 1988, 1989, 1990 This is an Unpublished Work which contains
Confidential and Secret Information which is protected under the copyright laws. The existence of the copyright
notice is not to be construed as an admission or presumption that publication has occurred. Unauthorized copy
ing is strictly prohibited. All Rights Reserved.




                                                                        Document Number
                                                            SIZE     CODE NUMBER                       REV
                                                              K       PS    3032041-0-0                CX01
                                                                         PAGE 1 OF 33
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  PRODUCT SPECIFICATION                                       di g i ta l                                    CONTINUATION SHEET

1.0 PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                                      6
    1.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                  6
    1.2 Model Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                 6
    1.3 Country Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                   6
    1.4 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           7
    1.5 Home Row Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                  7
    1.6 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       7
    1.7 Shape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      7
    1.8 Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    7
    1.9 Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    7
    1.10 DIGITAL Product Identity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                        8
2.0 APPLICABLE DOCUMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                                       8
    2.1 Compliance to Standards and Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                    8
    2.2 Product Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           8
    2.3 Electromagnetic Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                        8
    2.4 Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               8
    2.5 Acoustic Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             8
    2.6 Ergonomics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           8
    2.7 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            8
    2.8 Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         9
    2.9 Packaging & Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                 9
    2.10 Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                   9
    2.11 Mechanical Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                        9
3.0 PRODUCT REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                                         9
    3.1 KEYCAPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            9
    3.1.1 Keycap Actuation (distance in inches, force in grams) . . . . . . . . . . . . . . . . .                                          9
    3.1.2 Wobble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .        10
    3.1.3 Keytop Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         11
    3.1.4 Keytop Shape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            11
    3.1.5 Key Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           11
    3.1.6 Finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    11
    3.1.6.1 Texture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       11
    3.1.6.2 Reflectance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           11
    3.1.6.3 Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     11
    3.1.7 Legends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       11
    3.1.7.1 Key Top Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                  11
    3.1.7.2 Front Surface Printing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                  11
    3.1.7.3 Foreign Language Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                           12
    3.2 KEYSWITCH LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                            12
    3.2.1 Alpha Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          12
    3.2.2 Auxiliary Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              12
    3.2.3 Function Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             13
    3.2.4 Cursor and Basic Editor Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                        13
    3.3 KEYBOARD OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                13
    3.3.1 Shift Lock/Caps Lock Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                            13
    3.3.2 Keyboard Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                   13
    3.3.2.1 Timing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                     14
    3.3.2.2 Key Event Mode Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                        14
    3.3.2.2.1 Auto Repeat Encoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                      14
                                                                                             Document Number
                                                                           SIZE           CODE NUMBER                                      REV
                                                                             K             SP    3032041-0-0                              CX01
                                                                                              PAGE 2 OF 33
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  PRODUCT SPECIFICATION                                      di g i ta l                                   CONTINUATION SHEET

    3.3.2.2.2 Key Down/Key Up Encoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                            15
    3.3.2.3 N-Key Rollover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              15
    3.3.2.4 Simultaneous Keying Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                        15
    3.3.3 Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .        15
    3.3.3.1 Transmit Encoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               15
    3.3.3.2 Transmission Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               15
    3.3.4 Receiving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     15
    3.3.4.1 Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          15
    3.3.4.2 Auto Repeat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           15
    3.3.4.2.1 Timeout Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              16
    3.3.4.2.2 Repeat Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             16
    3.3.4.3 Volume Control of Keyclick and Bell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                             16
    3.3.4.4 Control of LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               16
    3.3.4.5 Keyboard Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                 16
    3.3.4.6 Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     16
    3.4 KEYBOARD ELECTRONICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                  16
    3.4.1 Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            16
    3.4.2 Key Click and Bell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              17
    3.4.3 Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                 17
    3.4.4 Indicators (LEDs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           17
    3.5 SERIAL INTERFACE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . .                                             17
    3.5.1 Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   17
    3.5.2 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       18
    3.5.3 Interface Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           18
    3.5.3.1 Received Data Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                18
    3.5.3.2 Power Return/Signal Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                           18
    3.5.3.3 Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         18
    3.5.3.4 Transmitted Data Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                   18
    3.5.4 Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       19
    3.5.5 Signal Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         19
4.0 PRODUCT QUALIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                                     19
    4.1 ENVIRONMENTAL REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                              19
    4.1.1 Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                19
    4.1.2 Storage Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              19
    4.1.3 Immunity to Contamination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                       19
    4.1.4 Impact Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             19
    4.1.5 Vibration Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              19
    4.2 RELIABILITY AND MAINTAINABILITY . . . . . . . . . . . . . . . . . . . . . . . . . .                                             19
    4.2.1 Mean Time Between Failures (MTBF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                 19
    4.2.2 Mean Time to Repair (MTTR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                            19
    4.2.3 Keyswitch Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          19
    4.2.4 Keyswitch Bounce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              20
    4.2.5 Keyswitch Actuation Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                         20
    4.2.6 Error Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .        20
    4.2.7 Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       20
    4.2.8 Tools and Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                    20
    4.3 STANDARDS, REGULATIONS, AND APPROVALS . . . . . . . . . . . . . . . . .                                                         20
    4.3.1 Product Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          20
    4.3.2 Electromagnetic Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                       21
    4.3.3 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           21
                                                                                          Document Number
                                                                  SIZE CODE NUMBER                                                       REV
                                                                      K               SP            3032041-0-0                         CX01
                                                                                              PAGE 3 OF 33
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  PRODUCT SPECIFICATION                                       di g i ta l                                  CONTINUATION SHEET

      4.3.4 Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       21
5.0    ORDER FILFULLMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                                21
      5.1 PACKING AND SHIPPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                              21
      5.1.1 General Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                    21
      5.1.1.1 Shipping Containers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                 21
      5.1.1.2 Dunnage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       21
      5.1.2 Cartons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     21
      5.1.2.1 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            21
      5.1.2.2 Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    22
      5.1.2.3 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      22
      5.1.2.4 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .        22
      5.1.3 Pallets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   22
      5.1.3.1 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            22
      5.1.3.2 Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    22
      5.1.3.3 Method of Unitizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                 22
      5.1.3.4 Load Shifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         23
      5.1.4 Product Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              23
      5.1.5 Non-operating Shock and Vibration testing per DEC STD 102, section 2.                                                         23
      5.1.5.1 Vibration (Random Vibration) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                        23
      5.1.5.2 Vibration (Repetitive Shock) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                      23
      5.1.5.3 Shock Test (Drop Tests) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                   24
      5.1.5.4 Test Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          24
      5.1.6 Product Package Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                       24
      5.1.6.1 Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       24
      5.1.6.2 Product Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               24
      5.1.6.3 P.O. Numbers on Master Cartons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                            24
      5.1.7 Pallet Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .        25
      5.1.7.1 Pallet Labeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           25
      5.1.7.2 Unpallettized Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                 25
      5.1.7.3 Packing Slips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           25
      5.1.8 Package Graphics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              25
      5.2 QUALITY ASSURANCE PROVISIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                            25
      5.2.1 Qualification Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            26
      5.2.2 Process Qualification Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                  26
      5.2.3 Product Qualification Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                    26
      5.2.4 Lot Acceptance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            26
      5.2.5 Non-conformance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                 26
      5.2.6 Corrective Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             26
      5.2.7 Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       26
      5.2.8 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .        26
      5.3 BAR CODE LABELING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                           26
      5.3.1 General Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                  26
      5.3.2 Format Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                 27
      5.3.2.1 Spaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    27
      5.3.2.2 Hyphens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       27
      5.3.2.3 Human Readable Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                         27
      5.3.2.4 Quite Zone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          27
      5.3.2.5 Preferred BAR CODE sizes: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                         27
      5.3.2.6 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      27
      5.3.2.7 Bar Code Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              27
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  5.3.2.8 Bar Code Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       28
  5.3.3 Product Label Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              28
  5.3.4 Product Carton Label Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                   28
  5.3.5 Pallet Label Requirements (see section 5.1.7) . . . . . . . . . . . . . . . . . . . . . . . .                       28
  5.3.6 Option Number Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         28
  5.3.7 Part Revision Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   29
  5.3.8 Serial Number Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       29
6.0 DEC STD 009 - ENGINEERING SPECIFICATION TABLES . .                                                                      29




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1.0 PRODUCT DESCRIPTION
1.1 General Description
     This specification covers the detailed requirements for a detachable 108-key keyboard which
     will operate with the VT400 family of terminals and subsequent terminals. This keyboard fills
     the requirements for separate Alt & Compose keys adjacent to the space bar. Two lighted
     indicators (LED’s) are provided to indicate Hold Screen and Shift Lock. The LK400 family of
     keyboards uses a capacitive switching array for accurate key switch closure sensing and a
     rubber spring sheet giving tactile feel to the keys. This keyboard is not intended to be a direct
     replacement for the LK201, but is electrically and firmware functionally compatible. The
     LK401 will be customer installable.
1.2 Model Designations
     All LK400 Family keyboards are designated by a model number which describes the keyswitch
     groups implemented, keycap placement and labeling. The keyboards described in this
     document are designated LK401-XX or LK402-XX. The LK401 being the General
     keyboard and the LK402 being the WPS variations.
         LK401-XX
                               Alphabetic describing keycap placement and labels
                               Alphabetic describing keycap placement and labels
                               Major Variation designator
                               LK401-XX General keyboard
                               LK402-XX WPS keyboard
1.3 Country Designations
     The vendor shall provide two basic keyboard models described as follows:
     (See K-DD-LK400-0-0 Drawing Directory for a complete list)
     LK401-XX General Model - with universal graphics
     ------------------------------------------------
     LK401-AA US/UK                               LK401-PA US/UK
     LK401-AB Flemish (Belgium)                   LK401-PB Flemish
     LK401-AC Canadian (French)                   LK401-PC Canadian (French)
     LK401-AD Danish                              LK401-PD Danish
     LK401-AF Finnish                             LK401-PF Finnish
     LK401-AG Austrian/German                     LK401-PG German
     LK401-AH Dutch                               LK401-PH Holland
     LK401-AI Italian                             LK401-PI Italian
     LK401-AK Swiss French                        LK401-PK Swiss-French
     LK401-AL Swiss German                        LK401-PL Swiss-German
     LK401-AM Swedish                             LK401-PM Swedish
     LK401-AN Norwegian                           LK401-PN Norwegian
     LK401-AP Belgian/French                      LK401-PP Belgian/French
     LK401-AS Spanish                             LK401-PS Spanish
     LK401-AV Portuguese                          LK401-PV Portiguese
     LK401-AT Hebrew

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     The above models will be provided by the vendor and shipped to Digital in the US and
     Digital’s Field Distribution Center in Europe.
     LK402-XX WPS Model - with WPS graphics & Gold key
     ----------------------------------------------------
     LK402-AA US/UK
     LK402-AB Flemish (Belgium)
     LK402-AC Canadian (French)
     LK402-AQ Canadian (English)
     LK402-AD Danish
     LK402-AF Finnish
     LK402-AG Austrian/German
     LK402-AH Dutch
     LK402-AI Italian
     LK402-AK Swiss French
     LK402-AL Swiss German
     LK402-AM Swedish
     LK402-AN Norwegian
     LK402-AP Belgian/French
     LK402-AS Spanish
     The above models will be provided by the vendor and shipped to Digital in the US and
     Digital’s Field Distribution Center in Europe.
1.4 Dimensions
     The overall nominal dimensions for the keyboard are width 18.8 inches, depth 7.5 inches and
     maximum height including keycaps 1.75 inches.
1.5 Home Row Height
     The height from the desktop to the finger contact surface of the home row keys shall be 1.181
     +/- .197 inches (30 +/- 5 millimeters) per GS requirements. (Ref. DIN STD ZH1/618)
1.6 Weight
     The weight of the keyboard including the interconnecting cable will be less than 4.5 pounds.
1.7 Shape
     Unsculptured keys will be mounted in rows on a curved base. The curved base will produce a
     sculptured keyboard profile without the necessity of sculptured keycaps.
1.8 Color
     The keyboard will be Digital Light Gray as described in DEC STD 092-XXXX-068.
     All LK401-P variations will be Olivetti inter color #CN02.
1.9 Cable
     The keyboard assembly will be connected to the terminal via a coiled cable which will be 6 feet
     long when uncoiled. The cable will have a 4-pin modular connector at the system end for all
     keyboard models.
     Cable color for LK401-P variations will be Olivetti inter dark #CN03.
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1.10 DIGITAL Product Identity
     The LK401 keyboard appearance shall meet DIGITAL’s corporate identity requirements as
     specified by DIGITAL’s Industrial Design Group. These requirements will cover the
     following design aspects:
     Shape
     Color
     Finish/Texture
     Material (See section 4.3.1, Product Safety)
     * Product Label (Ref. Digital Artwork # 3631441-0-0)
     * LED Symbols & Logo (Ref. Digital Artwork # 7438657-0-1)
     * Bottom Panel Artwork (Ref. DEC D-SS-7438658-0-1)
     * Keycap Artwork font shall be Helvetica Condensed type
     * Corrugated carton artwork (Ref. DEC A-PS-9908604-0-0)
     * Artwork shall be provided by DIGITAL.
2.0 APPLICABLE DOCUMENTS
     The following documents form a part of this specification to the extent referenced herein.
2.1 Compliance to Standards and Regulations
     The products covered by this specification shall comply with the following standards and
     regulations.
2.2 Product Safety
     DEC STD 119 - DIGITAL Product Safety
2.3 Electromagnetic Compatibility
     DEC STD 103 - Electromagnetic Compatibility (EMC) Hardware Design Requirements
     Class B
     FCC Rules and Regulations, Part 15 - Radio Frequency Devices, Subpart J
2.4 Communications
     EIA Standard RS-423 - Electrical Characteristics of Unbalanced Voltage Digital Interface
     Circuits
2.5 Acoustic Noise
     DEC STD 102 - Environmental Standard for Computers and Peripherals, Section 4
2.6 Ergonomics
     DEC STD 092 - Finish and Color Standard
     DEC STD 105 - Keyboards, Section 3
2.7 Environment
     DEC STD 102 - Environmental Standard for Computers and Peripherals
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2.8 Language
     DEC STD 107 - DIGITAL Standard for Terminal Keyboards. This Digital standard will be
     revised to include the keyboards described in this document.
2.9 Packaging & Labels
     DEC STD 043-0 Packaging Requirements for DIGITAL Products, Parts, Assemblies and
     Materials
     DEC STD 047 - Bar Code Symbology Criteria
     DEC STD 102 - Environmental Standard for Computers and Peripherals, Section 2
     DEC A-PS-9908604-0-0 - Carton, Corrugated
     DEC K-PA-3701175-0-DBU - Packaging Assembly, Keyboard
2.10 Related Documents
     DEC STD 060 - Design and Certification of Hardware Products to National and
     International Regulations and Standards
     DEC STD 009 - Product Engineering Specification
2.11 Mechanical Documents
     Cover                                  E-MD-7438657-0-DBU Rev. A
     Base                                   E-MD-7438658-0-DBU Rev. A
     Keytop, 1 Unit                         E-MD-7438661-0-DBU Rev. A
     Keytop, 1 Unit (Home Row)              E-MD-7438662-0-DBU Rev. A
     Keytop, 1 1/2 Width                    E-MD-7438663-0-DBU Rev. A
     Keytop, 1 1/2 Stepped                  E-MD-7438664-0-DBU Rev A
     Keytop, Double                         E-MD-7438665-0-DBU Rev. A
     Keytop, Vertical                       E-MD-7438666-0-DBU Rev. A
     Keytop, Return                         E-MD-7438667-0-DBU Rev. A
     Spacebar 7 Unit                        E-MD-7438668-0-DBU Rev. A
3.0 PRODUCT REQUIREMENTS
3.1 KEYCAPS
3.1.1 Keycap Actuation (distance in inches, force in grams)
     Characteristic                         Keys                               Spacebar
      Total travel                           .125" +/- .020"*                .125"+/- .020"*
      Travel to peak force                   .040" +/- .020"                 .040" +/- .020"
      Peak force                             55g +25g/-20g                    75g +30g/-20g
      Overtravel force                       75g max.**                         105g max.
      Actuation point                       .070" +/-.025"***               .070" +/-.025"***
      Release point                         .040" min.                          .040" min.

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    * Overtravel .015 inches min.
    ** Key to key variation 35g max. on any keyboard
    *** Operate point to occur .025 inches max. after completion of tactile drop
     NOTE: Characteristics to be measured with an actuator speed of .2 to .5 inches per minute.

                                                                                   Â
               65
               60
                               Å         Ä
               55
    F
    O          50
    R          45
    C                                               Ã
    E          40
               35
               30                                         Á
    G
    R          25
                                                         À
    A          20
    M
    S          15
               10
               5
               0
                    .00 .01 .02 .03 .04 .05 .06 .07 .08 .09 .10 .11 .12 .13
                               DISPLACEMENT (INCHES)
        Á   Electrical Operating Point              Ä     Peak Force
        Â   Full Over Travel                         Å    Travel to Peak Force
      À     Electrical Release Point                Ã     Tactile Drop Off = 35% of
                                                          Peak Force
                                                          (Tipical - Not Toleranced)
                           Downstroke                                Upstroke

                          ÇÉÊËÈÍÎÏÌÑ     Force Displacement Curve

3.1.2 Wobble
     The top of the keypad will not have lateral motion in excess of + or - 0.020 inches in the
     horizontal and vertical directions.

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3.1.3 Keytop Size
     The single width keytops shall be nominally 0.50 inches square.
3.1.4 Keytop Shape
     The keys will have a concave surface shape. The F and J keytops and the numeral 5 keytop on
     the numeric keypad will have a different surface whose shape is tailored for home row finger
     registration. This shall not be a raised "bump" or "ridge" which may cause finger irritation.
3.1.5 Key Spacing
     The single width keys shall be spaced 0.75 inches nominallly from center to center.
3.1.6 Finish
     The keycaps shall have a uniform finish on the tops and the sides.
3.1.6.1 Texture
     The keytop shall have a textured surface for non-skidding action but also not require
     frequent cleaning.
3.1.6.2 Reflectance
     The keycaps shall reflect less than 45% of the incident light.
3.1.6.3 Color
     The function keys located as the top row of keys, the cursor keys and the six keys located
     directly above the cursors will be Digital Nantucket Gray colorper DEC STD
     092-XXXX-240, except for LK401-P variations, which will be Olivetti inter dark #CN03. The
     remainder of the keys, which include the typewriter mass and the numeric keypad, will be the
     Digital Light Grey color per DEC STD 092-XXXX-068, except for LK401-P variations,
     which will be Olivetti inter dark #CN03.
3.1.7 Legends
     The marking of the keys and keyboard must be of a permanent nature. The marking must be
     clearly legible during the life of the keyboard. Keycap artwork will be supplied by Digital.
3.1.7.1 Key Top Characters
     There will be a maximum of four characters or two lines of type per key on the key top.
     Minimum character height shall be 0.1 inches. Where two are required, they will be placed at
     the upper left and lower left of the keycap. The unshifted legend will appear at the lower left
     and the shifted legend atthe upper left of the keycap. Only the upper case letter will appear at
     the upper left of the alpha keys.
3.1.7.2 Front Surface Printing
     There will be provision for front surface lettering with a maximum of two lines or .240 inches
     provided for all keycaps.
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                  3.1.7.3 Foreign Language Characters
                       Translations of keycap characters into the appropriate National Language will be made.
                       Keycap legends for these keyboards will be supplied by Digital.
                  3.2 KEYSWITCH LAYOUT
                       The keyswitch layout for the LK401 model keyboard will appear as shown in Figure 3.2. The
                       keyswitch designators conform to ISO 4169, Office Machines-Keyboards-Key Numbering
                       System and Layout Charts.
                  3.2.1 Alpha Keys
                       The alpha keys will be located on the lower left portion of the keyboard in the conventional
                       typewriter configuration 48 graphic key layout as per DEC STD 107.


G99 G00 G01 G02 G03                  G05 G06 G07 G08 G09             G11 G12 G13 G14              G15     G16     G20 G21 G22 G23



      E00 E01 E02       E03 E04 E05 E06 E07         E08 E09 E10 E11 E12           E13             E16 E17 E18     E20 E21   E22 E23

      D00     D01 D02 D03 D04 D05 D06 D07 D08 D09 D10 D11 D12                                     D16 D17 D18     D20 D21 D22 D23

C99     C00       C01 C02 C03 C04 C05 C06 C07 C08 C09 C10 C11 C12 C13                                   C17       C20 C21 C22 C23

  B99         B00 B01 B02 B03 B04 B05 B06 B07 B08 B09 B10                       B11               B16 B17 B18     B20 B21 B22

            A00        A01             A02 TO A08              A09        A10                                         A20   A22 A23


                                                     ÁÂÄÀÅÃÇÉÊËÇ Keyswitch L ayout
                  3.2.2 Auxiliary Keypad
                       The layout of the auxiliary keypad is illustrated in Figure 3.3. The arrangement shown in
                       Figure 3.3 is used to document the codes transmitted by the keyboard to the terminal.

                                                      ÈÍÎ ÈÍÏ ÈÍÍ ÈÍÌ

                                                       Ñ        Ó     Ô         ÖÍÌ

                                                       Ò        Õ     Š         ÚÍÌ

                                                       Ï        Í    Ì

                                                           Î         ÛÍÍ ÛÍÌ


                                               ÇÁÂÄÀÅÃÇÉÊÉÇ Auxiliary Keypad Layout
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3.2.3 Function Keys
     These keys are positioned so that their function can be easily distinguished by their location.
3.2.4 Cursor and Basic Editor Keys
     Space will be provided between the typewriter keypad and the auxiliary keypad for the cursor
     arrow keys and six other special function keys located above the cursors. The layout of this
     group of keys is shown in Figure 3.4.


                                       E16    E17     E18

                                       D16    D17 D18




                           ÁÂÄÀÅÃÇÉÊËÇ Cursor Control Key L ayout
3.3 KEYBOARD OPERATION
      The operator uses the keyboard to transmit encoded keying events to a buffer in the terminal.
      A keying event is transmitted when:
      1. any key is newly pressed
      2. any of a certain set of keys is released
      3. certain keys are held down and are generating auto repeat keying events
3.3.1 Shift Lock/Caps Lock Operation
      The LOCK key will normally be a down-only function key which will signal its activation as
      would any other key and will have no mechanical latching action.The usage of that event to
      implement Caps Lock or Shift Lock is determined by the terminal to which the keyboard is
      attached.
3.3.2 Keyboard Firmware
      A more detailed discussion of the keyboard firmware will be found in the LK400 Keyboard
      Firmware Requirements. What is presented here is a short description of some of the basic
      functional capabilities of the keyboard firmware. Any discrepancy between the descriptions
      here and the Firmware Requirements will be decided by the description in the Firmware
      Requirements.
      The firmware in the keyboard executes three concurrent tasks. The first task consists of
      detecting any changes in the state of the keyboard matrix, referred to as the process of
      scanning the keyboard. The second task consists of transmitting the results of the keyboard
      scan to the terminal. The third task consists of receiving information from the terminal. This
      information may be relative to either controlling peripheral hardware on the keyboard or may
      be relevant to transmission parameters.
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3.3.2.1 Timing Requirements
     The firmware is designed to detect a keystroke lasting for as little as 20 milliseconds as well as
     provide noise and contact bounce filtering.
     The keyswitch matrix will be scanned at a 120 hertz rate. The latency of event detection, i.e.,
     the time of delay between actual keyswitch closure and detection, will be between 1/120 and
     1/60 second. (An additional 1/500 second is required for transmission of the event from the
     keyboard to the terminal.) The minimum time a key must be kept down in order to be
     detected is approximately 9 ms.
     The scan interval assures that keyswitch bounce will not cause multiple events.
     The recommended time delay for the terminal to display the character after receipt of the
     event is less than 100 milliseconds. The time for the initiation of the keyclick in the keyboard
     is less than 1 millisecond after the keyboard detects the event.
3.3.2.2 Key Event Mode Selection
     There are four modes in which key events can be transmitted. These mode are:
     1. Key down only
     2. Key down with auto repeat
     3. Key down and key up
     4. Key down with auto repeat and key up
     The keys are divided into functional groups which can be software controlled by terminal to
     operate in any of the above four modes.
     These fourteen functional groups are:
     1. 48 graphic keys and Spacebar on the typewriter mass
     2. Numeric keypad
     3. Delete Character (E12)
     4. Return (C13) and Tab (D00)
     5. Shift (B99 and B11),CTRL (C99), A01, and A09
     6. Lock (C00), A00 and A10
     7. Horizontal cursors (B16 and B18)
     8. Vertical cursors (B17 and C17)
     9. Six keys directly above the cursor keys (D16-D18 and E16-E18)
     10. G99-G04 Function keys
     11. G05-G09 Function keys
     12. G10-G14 Function keys
     13. G15-G16 Function keys
     14. G20-G23 Function keys
     The keyswitch designators are located on Figure 3.2, LK401 Keyswitch Layout.
3.3.2.2.1 Auto Repeat Encoding
     There are four sets of programmable auto repeat parameters. Each of the above fourteen
     functional groups which are operating in either auto repeat mode maybe associated with any
     of the four sets.
     A unique code will be used as the repeat code. This repeat code will be sent at a constant rate
     which is settable as described below. Every transmission of this code will imply that the
     previous auto repeating character should be displayed once more.
     Only one character at a time will be auto repeated.
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3.3.2.2.2 Key Down/Key Up Encoding
     When the key down/key up mode is requested, the transmission of the key matrix position in
     the range of 64 to 255 will indicate a key down. There will be single "all keys up" code which
     will indicate all down/up keys are up. If,when a down/up key is released and any down/up key
     up-mode key is still down, the appropriate key matrix position will be transmitted.
     Otherwise, the "all keys up" code will be transmitted. This also applies to
     down/autorepeat/upkeys.
3.3.2.3 N-Key Rollover
     The keyboard will transmit all keying events provided the output buffer does not overflow.
3.3.2.4 Simultaneous Keying Events

     It is possible that more than one keying event may be detected in one scan period. When this
     happens, the events will be transmitted to the terminal in the order in which they were
     detected. A buffer will be provided to store 4-32 simultaneous keying events. Events which
     cannot be transmitted due to buffer limitations will be transmitted on the next scan period.
3.3.3 Transmission
3.3.3.1 Transmit Encoding
     The frame structure will be ten signal elements having equal time intervals:
         One "0" (spacing) start element.
        Eight data elements, and,
         One "1" (marking) stop element.
     The encoding of the keystroke indicates the physical position of the key. This information is
     sent as a single 8 bit byte. This number will range from 64 to 255 decimal.
3.3.3.2 Transmission Rate
     The transmission rate within each frame is 4800 Baud.
3.3.4 Receiving
     The terminal controls keyboard characteristics by using the receive capability of the keyboard
     electronics.
     The protocol for the transmission of codes from the terminal to the keyboard can be found in
     the LK400 Keyboard Firmware Requirements.
     The terminal can initiate the keyclick and does initiate the bell tone.
3.3.4.1 Flow Control
     The terminal is able to inhibit and resume the transmission from the keyboard.
3.3.4.2 Auto Repeat
     The auto repeat timeout interval and rate for any of the keyswitch groups listed above can be
     set by the terminal as described in the LK400 Firmware Requirements.
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3.3.4.2.1 Timeout Interval
      Timeout represents the amount of time the keyboard will wait before auto repeating a
      character. The timeout interval will be the transmitted number times 5 milliseconds. This
      would be the second byte transmitted.
3.3.4.2.2 Repeat Interval
      This is the effective rate at which characters will be transmitted. The repeat rate will be the
      transmitted number.
3.3.4.3 Volume Control of Keyclick and Bell
      The terminal can set the keyclick levels by transmitting a command byte followed by a volume
      level parameter or it can allow them to be set to the default values.
      The Bell level is set by transmitting the appropriate command byte followed by the same
      parameters as for the keyclick.
      The keyclick and Bell volumes when set to their maximum values will be a minimum of 60
      dbA when measured one foot above the keyboard.
      Eight levels of volume plus off will be provided for both the keyclick and the bell. The user
      should be able to set these to their preference via a setup feature on the terminal.
3.3.4.4 Control of LEDs
      The terminal can turn the LEDs on and off by command from the terminal.
3.3.4.5 Keyboard Identification
      The keyboard will transmit a two-byte code for identification of the keyboard model. Both
      bytes are in ROM and indicate the revision status of the firmware. This keyboard
      identification will be sent upon request from the terminal.
      The user must identify the keyboard to the terminal, i.e., what natural language, German,
      French, etc., either in the Set-up mode or through escape sequences when he switches
      keycaps or keyboards. The hardware ID is hard coded at 00H.
3.3.4.6 Self Test
      Upon command from the terminal or on keyboard power up, the keyboard will automatically
      check its internal logic and transmit a two byte identification code plus a two byte code
      describing the health of the electronics and firmware. The four bytes transmitted at power up
      are:
      1. Firmware ID
      2. Firmware ID - second byte
      3. Error code or 0 - Error code can indicate RAM
      or ROM check sum error
      or key down condition
      4. Keycode or 0 - Indicates specific key down if any.
3.4 KEYBOARD ELECTRONICS
3.4.1 Implementation
      A microprocessor will be used to detect key closures and to transmit the associated keying
      events to the terminal. The key switches will be arranged electrically in a matrix. The matrix
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     scanning frequency and baud rate clock will be derived from the chip’s internal
     timer/counters.
3.4.2 Key Click and Bell
     The click on/off and volume will be selectable.
     The sounder will alo be used to produce the Bell tone. Its volume will also be selectable.
3.4.3 Power Consumption
     2.0 Watts Maximum. Input: 11.8 V +/- 6% @ 150 ma. measured at the PC board or
     equivalent. The current draw at idle will be approximately 10 ma.
3.4.4 Indicators (LEDs)
     There are two LED indicators implemented on the keyboard. These will be grouped near the
     upper portion of the keyboard where they will be easily visible to the operator. These
     indicators will be identified by Icons molded directly into the plastic housing and shall not
     require a diffusion window to be created for their viewing. The two indicators will have the
     meaning of:
     1. Hold Screen - Indicates that updating of the monitor screen has been suspended. (Hold
     Screen Key is G99)
     2. LOCK - Indicates that the keyboard is in either a CAPS LOCK or SHIFT LOCK
     condition.
3.5 SERIAL INTERFACE REQUIREMENTS
     The serial interface shall contain the functionality presented in this section. The intent is for
     compatibility with Digital’s keyboard input ports.
3.5.1 Cable
     The cable shall be a four wire conductor made of #26 gage wire. The shape shall be oval and
     coiled over most of the length. The usable length shall be six feet long. The uncoiled length
     on the system end shall be 5 inches. The uncoiled length on the keyboard end shall be 22
     inches. Details of this cable shall meet the general requirements of the Digital part specified
     in A-PS-1700294-0-0.




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3.5.2 Connector
     The connector shall be a 4 pin male modular telephone type. Details of the connector are per
     A-PS-1218831-0-0.
                                      1       2     3       4




                                          Viewed from end
                                     ÁÂÄÀÅÃÇÉÊË Connector

3.5.3 Interface Signals
          WIRE        FUNCTION                                        SIGNAL LEVEL
           1          Received Data Signal                            EIA RS-423 like
           2          Power Return/Signal Reference                   0 V DC
           3          Power Input                                     +12 V DC
           4          Transmitted Data Signal                         EIA RS-423 like

     The waveform of the transmitted data signal will have a trapazoidal shape where the slopes of
     the trapazoid will be adjusted so that the limits of the FCC Rules and Regulations, Part 15 will
     be met.
3.5.3.1 Received Data Signal
     The keyboard shall receive signals on this circuit which represent serially encoded commands
     and data being sent to the keyboard.
3.5.3.2 Power Return/Signal Reference
     This is the keyboard ground reference line. It is used for both power return and signal
     reference.
3.5.3.3 Power Input
     This line supplies power to the keyboard.
3.5.3.4 Transmitted Data Signal
     The keyboard shall send signals on this circuit which represent serially encoded keystroke
     data and responses to commands being sent from the keyboard.
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3.5.4 Baud Rate
     The keyboard shall have a baud rate of 4800 baud only.
3.5.5 Signal Format
     The signal format shall be bit serial, character asynchronous, consisting of a start bit (space),
     8 data bits (1=mark, 0=space), and a stop bit (mark). The data bits shall represent a
     command, data, or a response to a command. The least significant bit is leading.
4.0 PRODUCT QUALIFICATION
4.1 ENVIRONMENTAL REQUIREMENTS
4.1.1 Operating Conditions
     Per DEC STD 102 Class B, Section 3.1, 10-90% relative humidity, noncondensing, at 10 to 40
     Degrees Centigrade range.
4.1.2 Storage Conditions
     Per DEC STD 102, Section 3.2, -40 to 66 Degrees Centigrade range at 10-90% relative
     humidity.
4.1.3 Immunity to Contamination
     During normal operation, the keyboard shall not become functionally disabled due to dirt, or
     dust.
4.1.4 Impact Resistance
     Per DEC STD 102, Section 5.0, 40G shock for 30 milliseconds.
4.1.5 Vibration Resistance
     Per DEC STD 102, Section 6.0 - 6.2.
4.2 RELIABILITY AND MAINTAINABILITY
4.2.1 Mean Time Between Failures (MTBF)
     The keyboard electronics shall have a MTBF greater than 450,000 power-on hours.
     Expected usage: 60% Power-on Duty Cycle (438 hrs/month) 5% input Duty Cycle
     (22 hrs/month)
     No preventive maintenance, either by user or service person, shall be necessary to achieve
     the specified MTBF.
4.2.2 Mean Time to Repair (MTTR)
     This keyboard is a whole option swap. The mean time to repair is the time to install another
     keyboard. (.1 hrs.)
4.2.3 Keyswitch Life
     The standard keys and space bar must operate smoothly for 20 million operations with 90% of
     the keyboards surviving without evidence of keyswitches sticking or binding. The special
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     keys, double and 1 1/2 width, which are considered low usage keys, must be operate smoothly
     for a minimum of 5 million cycles with 90%of the keyboards surviving without evidence of
     these keyswitches sticking or binding. Loss of tactile feel is considered a failure.
4.2.4 Keyswitch Bounce
     Keyswitch contact bounce shall not effect the output of the keyboard.
4.2.5 Keyswitch Actuation Frequency
     All keys must operate properly for actuation frequencies up to 10 cycles per second.
4.2.6 Error Rate
     Occurrences of incorrect coded outputs, missed outputs, or double entries shall not exceed
     the ratio of one per 100,000 events. For typing at 65 words/min.for 3 hours/day and assuming
     6 characters/word, this results in less than one error per day.
4.2.7 Spare Parts
     The reliability of replacement keyboards shall be the same as new keyboards. There are no
     spare parts since this keyboard is a whole option swap.
4.2.8 Tools and Test Equipment
     No special tools or test equipment shall be needed to install this keyboard. This keyboard is
     customer installable.
4.3 STANDARDS, REGULATIONS, AND APPROVALS
     The product covered by this specification shall comply with the following standards and
     regulations. All tests shall be conducted by the vendor and be subject to DIGITAL approval
     and verification.
4.3.1 Product Safety
     The keyboard plastics must meet the flammability requirements as specified by UL94 HB.
     The PCB module, raw board, must meet or exceed UL94 V1. The PCB module, stuffed, must
     meet or exceed UL94 V2.
     The keyboard shall meet all SELV requirements and all other applicable requirements of the
     following documents:
     DEC STD 119 - DIGITAL Product Safety (Covers UL 478, UL 114, CSA 22.2 No. 220, VDE
     0804, IEC 435, GS-Mark)
     UL Standard 478 - Electrical Data Processing Units and Systems
     CSA Standard C22.2 - Canadian Electrical Code, Part II, Safety Standard for Electrical
     Equipment.
     *IEC 380 - Safety of Electrically Energized Office Equipment
     *IEC 435 - Safety of Data Processing Equipment
     * Recently replaced by EN60950
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4.3.2 Electromagnetic Compatibility
     DEC STD 103 - Electromagnetic Compatibility (EMC) Hardware Design Requirements
     FCC Rules and Regulations, Part 15 - Radio Frequency Devices, Subpart J(B-level).
     VDE 0871 - Limits of Radio Interference from Radio Frequency Apparatus and
     Installations, Class B.
     VDE 0875 - Regulations for the Radio Frequency Suppression of Appliances, Machines, and
     Installations for Radio Frequencies from 0 to 10 KHz, Class B
     Radio Protection Mark is not a requirement.
     Note: This product must meet DEC STD 103 which imposes a stricter limit on interference
     than FCC Part 15J.
4.3.3 Environment
     DEC STD 102 - Environmental Standard for Computers and Peripherals (Class B,with
     operating temperature range of 10 to 40 degrees C and 10 to 90 percent relative humidity)
4.3.4 Approvals
     The product covered by this specification shall be designed such that it shall obtain the
     following listings, certifications, and approvals:
     1. (Safety) Listing against UL 1950, CSA 22.2 No. 220, IEC 950, and GS-Mark.
     2. (EMI/RFI) Internal certification of compliance to FCC B level and compliance to VDE
     0871 and VDE 0875.
5.0 ORDER FILFULLMENT
5.1 PACKING AND SHIPPING
5.1.1 General Requirements
5.1.1.1 Shipping Containers
     The shipping container must provide adequate strength for handling, storage, and shipping
     throughout the distribution system. Additionally it must meet all local and national
     regulations for the countries where it will be used. It must meet the U.S.A. Uniform Freight
     Classification Rule 41 and the National Motor Freight Classification Item 222.
5.1.1.2 Dunnage
     Packages should be sized to minimize the use of dunnage. Where dunnage is necessary,
     materials shall be clean with minimal dusting. The use of loose fill in the form of expanded
     plastics is unacceptable.
5.1.2 Cartons
5.1.2.1 Construction
     Cartons used for shipping of items to Digital shall be constructed of corrugated fiberboard
     (unless otherwise specified), with adequate strength to comply with applicable regulations.
     Glued, taped or stitched manufacturers joints are required. All shipping containers shall
     withstand minimum static compression load. Minimum static compression can be
     determined through the following formula:
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     L = W x [(H-h)/h] x FS
     L = static load packaged product must withstand.
     W = shipping weight of packaged product.
     H = 6096 for metric measurement, 240 for U.S. measurement.
     h = height of packaged product measured in mm or inches.
     FS = 4 design factor of safety.
5.1.2.2 Size
     The shipping container size shall result in the optimum cube for shipping, storage and
     handling while complying with all other requirements of this document.
5.1.2.3 Weight
     Shall be 40 pounds maximum for individual cartons, except when a single item weighs more
     than 40 pounds, it shall be individually packaged.
5.1.2.4 Contents
     All items in a carton shall have the same Digital part number.
     Each carton shall contain as many items as is safe (ex. weight); multiples of 10 are preferred.
5.1.3 Pallets
5.1.3.1 Construction
     Shall be per the National Wood Pallet and Container Association specification, or Digital
     approved International standard equivalent. Reused pallets shall be in good repair. Each
     pallet shall be constructed to permit four-way entry by a fork truck and two-way entry by a
     pallet truck. Wing pallets are acceptable, with approval of the responsible Digital engineer.
     The top deck board spacing shall be 3.5 inches maximum, the bottom deck shall contain at
     least three boards (1 x 6 inches minimum).
5.1.3.2 Size
     Shall be one of the following, unless otherwise specified:
     A. 40" x 48"
     B. 42" x 48"
     Pallet strength must safely handle a minimum load of 2000 pounds.
5.1.3.3 Method of Unitizing
     A. Load Overhang: Pallet load shall not overhang the pallet.
     B. Load Underhang: The underhang of a load shall be less than 1" per side in order to
     achieve maximum cube utilization and load stability during shipping,handling, and storage.
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5.1.3.4 Load Shifting
     Load shifting during shipping and handling is unacceptable. The load shall be unitized and
     firmly secured to the pallet by one or more of the following methods :
     A. Strapping with corner protectors
     B. Stretch or shrink wrap
     C. Stretch netting
     D. Consolidation carton
     If straps are used, they shall be parallel to the pallet runners to minimize damage by pallet
     trucks. Strapping will be secured using crimp seals or tension weld. Load height will be set so
     that the 90 inch trailer height will be effectively utilized, unless otherwise specified.
5.1.4 Product Protection
     Items shall be properly packaged to prevent damage during handling, transit, and storage.
     Packaging shall be free from all handling hazards such as, protruding staples,and insecure
     strapping. The packaged item which could be shipped as an unpalletized single unit to an
     end user, even if it moves in pallet load quantities during a portion of its physical distribution,
     shall protect the item as specified in Table 1.
5.1.5 Non-operating Shock and Vibration testing per DEC STD 102, section 2.
     The following testing will be required as described below:
5.1.5.1 Vibration (Random Vibration)
     Random Vibration tests controlled with digital Random Vibration Controllers:
     - Tests applied to packaged or skidded product.
     - Test duration will be one hour per axis.
     - Packaged products weighing 100 lbs. (45 Kg.) or less shall be subjected to the vertical axis
     excitation in all three axis.
     Vertical Axis Excitation:
     - 1.19 G’s rms (root mean squared) overall from 5-300 Hz.
     - Power Spectral Density 0.003 g2/Hz at 5 Hz, increasing at 8db/octave to 0.020 g2/Hz from
     10-50 Hz with 8db/octave rolloff from 50-300 Hz.
     Longitudinal and Lateral Axes Excitation:
     - 0.6998 G’s rms (root mean squared) overall from 5-200 Hz.
     - Power Spectral Density 0.0011 g2/Hz at 5 Hz, increasing at 8db/octave to 0.007 g2/Hz at 10
     Hz. Flat 0.007 g2/Hz from 10-50 Hz with 8db/octave rolloff from 50-200 Hz.
5.1.5.2 Vibration (Repetitive Shock)
     - Repetitive Shock (Bounce) tests applied according to NSTA (National Safe Transit Assoc.)
     with test equipment which complies with ASTM (American Society for Testing of Materials)
     D-999. Tests applied to packaged or skidded product for durations of exposure determined by
     total weight.
     - Items weighing 100lbs. (45 Kg.) or less receive 14200 total impacts on two faces.
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5.1.5.3 Shock Test (Drop Tests)
     - Free Fall Drop Tests are applied to packaged products according to NSTA with test
     equipment which complies with ASTM D-775. Drop heights determined by total weight and
     10 total impacts applied to surfaces in the specified NSTA sequence.
     (Impacts shall consist of a corner drop to the bottom corner of the manufacturers joint, an
     edge drop to each of the edges radiating from that corner, and one flat drop to each of the six
     faces of the carton.)
      - Drop Heights range from 12 in. (31 cm) to 30 in. (77 cm) depending on the weight of the
     packaged product (see Table 1). Items weighing greater than 100lbs. (45 Kg.) are tested using
     the NSTA Inclined Impact method.
                                           TABLE 1
                                        IMPACT TEST
                   GROSS WEIGHT                            DROP HEIGHT
                     (POUNDS)                                (INCHES)
                     0 - 20.9                                   30
                    21 - 40.9                                   24
                    41 - 60.9                                   18
                    61 - 100                                    12
5.1.5.4 Test Reports
     The supplier shall provide copies of its test reports to Digital. If the supplier has documented
     proof showing a history of successful shipments of a product and is willing to share that
     information with Digital, the requirements for laboratory testing may be minimized.
5.1.6 Product Package Description
     Product package shall be of a structure and design provided by the Vendor, and qualified and
     approved by Digital.
5.1.6.1 Marking
     All markings shall be legible and large enough to be easily read, and shall not be obscured.
     NO vendor markings or reference to vendors product and/or trade name shall appear
     anywhere.
5.1.6.2 Product Package
     A product package is a package which contains only one DEC Option No. Each individual
     package shall be labelled on two adjacent sides with human readable and barcode format
     labels. Refer to Bar Code Labeling section 5.3.
5.1.6.3 P.O. Numbers on Master Cartons
     A. Purchase order numbers shall appear on master cartons when different P.O.’s are being
     fulfilled in the same shipment.
     B. Handwriting of P.O. numbers is allowed.
     C. P.O. numbers shall not be included on the Master carton barcode labels.
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5.1.7 Pallet Loads
5.1.7.1 Pallet Labeling
     Whenever possible all cartons that are combined within a pallet load shall contain identical
     product Option Numbers. Each pallet load shall be labeled on two adjacent sides with the
     following inforation:
     A. Digital Option Number
     B. Quantity
     C. P.O. Number
     D. Number of cartons to pallet load
     E. Vendor Address
     Whenever possible all cartons combined within a pallet load shall contain identical Date
     codes. In the event that unlike date codes are combined on a pallet load, the pallet load shall
     be chronologically unitized, and marked "UNLIKE DATE CODES"
     All pallet load markings shall be done on a peel-off type label.
5.1.7.2 Unpallettized Loads
     In the event a product package(s) or consolidated carton(s) is shipped loose-piece
     (unpallettized), the destination name and address shall not be permanently labeled or
     marked on either the package or the carton. Only a peel-off type label shall be used.
5.1.7.3 Packing Slips
     All packing slips shall be placed within a packing envelope and should be easily accessible and
     identifiable on each shipment. There should be only one packing slip per P.O. Number. Each
     packing slip shall contain the following information:
     A. P. O. Number
     B. Item Number
     C. DEC Purchasing Part Number
     D. Quantity (matching the DEC part number)
     E. DEC Option Number
     F. Quantity (matching the DEC option number)
5.1.8 Package Graphics
     Vendor logos shall not be preprinted, stenciled, stamped, or marked in any manner on a
     container that is to be shipped to a Digital customer. Digital will supply the vendor with
     camera ready artwork and the control drawing with the Digital graphics per DEC
     A-PS-9908604-0-0. The vendor shall supply Digital with 3 printed cartons for print quality
     approval.
5.2 QUALITY ASSURANCE PROVISIONS
     Items submitted for approval shall be representative of the vendor’s normal production.
     Approval will be granted after the items have been examined, tested and found to meet the
     requirements of this specification. After approval, items supplied in accordance with the
     requirements of this specification must be the same as the items submitted for approval.
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5.2.1 Qualification Test
     The vendor shall be responsible for performing qualification tests specified in paragraphs
     5.2.2 - 5.2.3 and provide valid test data to Digital upon request.
5.2.2 Process Qualification Test
     The vendor shall perform process qualification test(s) on his process(es) intended to
     produce product(s) for shipment to Digital. Process Qualification Tests shall identify any
     weakness(es) in the vendors process that may result in the production of non-conforming
     product(s) intended for shipment to Digital.
5.2.3 Product Qualification Test
     The vendor shall perform Product Qualification Test(s) to determine that Digital
     specification requirements are consistently being met. Qualified product(s) shall be only
     those articles being produced by a qualified process and these products shall consistently
     meet Lot Acceptance criteria specified in paragraph 5.2.4.
5.2.4 Lot Acceptance
     All incoming shipments may be subjected to Lot Acceptance Testing by Digital based on the
     Quality requirements as expressed in the applicable purchase specification(s). A 100%
     quality acceptance is to be maintained by the supplier in accordance with the applicable
     engineering specification(s) and the Digital Base Order Agreement (BOA).
5.2.5 Non-conformance
     In the event a lot fails to meet the Lot Acceptance criteria, the lot may be further processed in
     accordance with Sec: VI "Inspection and Acceptance" of the BOA.
5.2.6 Corrective Action
     Upon notification to the vendor by Digital of non-conformance, the vendor shall provide
     written response within 15 days.
5.2.7 Changes
     Upon successful demonstration that paragraphs 5.2.2 and 5.2.3 are consistently being met,
     the vendor shall comply with Section XII "Changes" of the BOA prior to implementing any
     change(s).
5.2.8 Warranty
     The manufacturer shall warrant that each article shipped shall meet the requirements of this
     specification.
     The warranty period and terms of the warranty covered by the BOA shall be adhered to.

5.3 BAR CODE LABELING
5.3.1 General Requirements
     The purpose of this section is to achieve consistent use of BAR codes throughout Digital. All
     product cartons shall be labeled in BAR CODE format. This includes cartons for individual
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     saleable units and Master Pack shipment cartons.
     The industry standard "CODE 39" bar code symbology shall be used for all bar coding
     applications.
     The supplier is responsible for maintaining suitable backup documentation for all bar coded
     symbols.
5.3.2 Format Requirements
     All Bar Code information will be printed in the Unaligned Format.
5.3.2.1 Spaces
     There shall be no leading spaces in any BAR CODED fields.
5.3.2.2 Hyphens
     A. Hyphens must have characters on both sides.
     B. Hyphens must be included when they separate the two-five-two part number format.
     C. Hyphens must be included when they separate the option and variation.
5.3.2.3 Human Readable Characters
     A. Human readable characters must always be printed with the BAR CODE.
     B. Start and stop characters may or may not be printed in the human readable form. The start
     and stop character is "*". (*LK401-AA*)
     C. BAR CODE and human readable characters shall be centered on the label.
5.3.2.4 Quite Zone
     A minimum of 0.25 inch quiet zone shall separate BAR CODES.
5.3.2.5 Preferred BAR CODE sizes:
                   size           BAR CODE                 human readable
                   small            3/16"                     5/32"
                   medium           3/16"                      1/4"
                   large            3/8"                       5/8"
5.3.2.6 Location
     BAR CODE labels shall not obstruct any nomenclature. The labels shall be placed to
     facilitate easy scanning and reading.
5.3.2.7 Bar Code Quality
     Do not cover the BAR CODE with closure tape.
     BAR CODES shall be affixed without being folded, creased, or torn.
     Printing of BAR CODES shall be done without defects to maintain readability.



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5.3.2.8 Bar Code Verification
     All BAR CODES shall be verified acceptable by Digital prior to supplier use.
5.3.3 Product Label Requirements
     The "product" BAR CODE label shall have the following information:
     A. Serial Number - as outlined in section 5.3.8
     Additional requirements:
     A. The location shall be on or next to the product label.
     B. Size - small

5.3.4 Product Carton Label Requirements
     The "product carton" BAR CODE label shall have the following information:
     A. Option Number - as outlined in section 5.3.6
     B. Revision - as outlined in section 5.3.7
     C. Serial Number - as outlined in section 5.3.8
     Additional requirements:
     A. Two (2) labels are required.
     B. Located on two adjacent sides.
     C. Labels affixed in the "tick mark" areas provided on the pre-printed cartons.
     D. Size - small
5.3.5 Pallet Label Requirements (see section 5.1.7)
     The BAR CODE label shall have the following information:
     A. Option Number - as outlined in section 5.3.6
     B. Quantity
     Additional requirements:
     A. Two (2) labels are required.
     B. Located on two adjacent sides.
     C. Size - large
     D. BAR CODE labels for each carton are visible from the outside of the pallet load.
5.3.6 Option Number Label
     The option number shall be BAR CODED in an eight (8) alpha-numeric character field
     containing the following information:
     5 character - option number (LK401)
     1 character - dash (-)
     2 character - variation identifier (AA)
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5.3.7 Part Revision Label
     The product revision level shall be BAR CODED in a four character field containing the
     following information:
     2 character - alpha part revision (use one or two as needed)
     2 character - numeric part revision (must contain two digits) (use leading zero)
     The first part revision label bar code would read: A01
5.3.8 Serial Number Label
     Starting with the site code to the left, the serial number shall be BAR CODED in a ten (10)
     alpha-numeric character field containing the following information:
     2 character - site/supplier code (to be supplied by Digital)
     1 character - last number of year
     2 character - week of year (01 to 52)
     5 character - unique serial number
     (alpha-numeric mix)
     If date codes are used without serial numbers fill in that portion (five characters) with zeros.
     The date of manufacture is the means of identifying product to when it was manufactuered to
     meet traceability requirements.

6.0 DEC STD 009 - ENGINEERING SPECIFICATION TABLES
     The following DEC Standard Engineering Specification Tables identify parameters which
     must be specified and approved by DIGITAL before a product contract can be signed.
     Applicable sections must be filled out during the planning and development phases of the
     program.




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                       6.1 Table 1 - Physical Specification
     PARAMETERS                MIN    TYP       MAX            UNITS          SYMBOL
  Mounting Code                        TT
  Height                              4.76                    centimeters         cm
                                      1.88                    inches              in
  Width                               48.3                    centimeters         cm
                                      19.0                    inches              in
  Depth                               19.2                    centimeters         cm
                                      7.56                    inches              in
  Weight                              1.16                    kilograms           kg
                                      2.56                    pounds              lb
  Shipping Height                     5.72                    centimeters         cm
                                      2.25                    inches              in
  Shipping Width                      58.4                    centimeters         cm
                                      23.0                    inches              in
  Shipping Depth                      25.4                    centimeters         cm
                                      10.0                    inches              in
  Shipping Weight                     1.82                    centimeters         cm
                                       4.0                    inches              in
  Shipping Code                        BX
  Data Cable                          1.83                    meters              m
  Type - 4 Wire Phone                 72.0                    inches              in


                    6.2 Table 2 - Environmental Specifications
    PARAMETERS                 MIN    TYP       MAX           UNITS           SYMBOL
   Temperature                 10.0             40.0         degrees Celsius    C
   (Operating)                 50.0             104.0        degrees Fahrenheit F
   Temperature                 -40              66.0         degrees Celsius    C
   (Nonoperating)              -40              151.0        degrees Fahrenheit F
   Temperature                 -40              66.0         degrees Celsius      C
   (Storage)                   -40              151.0        degrees Fahrenheit   F
   Temperature Rate                             10.0         degrees Celsius      C /h
   of Change (Operating)                                     per hour
                                                50.0         degrees Fahrenheit   F /h
                                                             per hour
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                  6.2 Table 2 - Environmental Specifications (continued)

     PARAMETERS                 MIN      TYP      MAX            UNITS            SYMBOL
   Relitive Humidity            10.0              90.0         persent relitive    %RH
   (Operating)                                                 humidity
                                                               (noncondensing)
   Relitive Humidity            10.0              95.0         persent relitive    %RH
   (Nonoperating)                                              humidity
   Relitive Humidity            10.0              95.0         persent relitive   %RH
   (Storage)                                                   humidity
                                                               (noncondensing)
   Relitive Humidity                              10.0         persent relitive   %RH/h
   Rate of Change                                              humidity
   (Operating)                                                 per hour
   Maximum Wet Blub                               32.0         degrees Celsius    C
   Temperature                                    89.6         degrees Fahrenheit F
   (Operating)
   Maximum Wet Blub                               52.0         degrees Celsius    C
   Temperature                                    126.0        degrees Fahrenheit F
   (Storage)
   Minimum Dew Point            15.0                           degrees Celsius    C
   Temperature                  59.0                           degrees Fahrenheit F
   (Operating)
   Minimum Dew Point            23.0                           degrees Celsius    C
   Temperature                  73.4                           degrees Fahrenheit F
   (Nonoperating)
   Heat Dissipation                      0.60     1.80         watts               W
                                         2.05     6.14         btu/h               btu/h
   Altitude                                       2438         meters              m
   (Operating)                                    8000         feet                ft
   Altitude                                       4877         meters              m
   (Nonoperating)                                 16000        feet                ft
   Mechanical Shock           Duration            5.00         milliseconds        ms
   (Operating)                Level               25.0         gravities           g
   Vibration       Freq.        5.00              500.0        Hertz               Hz
   (Operating)     Level                 20.0                  gravities           g
   Mechanical Shock           Duration             --          milliseconds        ms
   (nonoperating)             Level               40.0         gravities           g
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                 6.2   Table 2 - Environmental Specifications (continued)
     PARAMETERS                MIN     TYP       MAX           UNITS         SYMBOL
   Vibration            Range 5.00               500.0         Hertz          Hz
   (nonoperating)       Lever          20.0                    gravities      g
    Acoustics           Oper.
                        LNPE           6.10                    Bels           B
                        LPA            55.0                    Decibels       dbA
                        Idle
                        LNPE           5.10                    Bels           B
                        LPA            46.0                    Decibels       dbA

                        6.3   Table 3 - EMS Specifications
             PARAMETERS                  QUANTITY              UNITS         SYMBOL
   Broadband
   Radiated EMI      30-88 MHz           40.0                  decibels       db/uV
                     88-116 MHz          43.5                  per            db/uV
                     216-1 GHz           46.0                  microvolt      db/uV
   Conducted EMI     10-450 KHz          97-54                 decibels       db/uV
                     450-1 MHz           54.0                  per            db/uV
                     1-30 MHz            48.0                  microvolt      db/uV
   Narrowband           Frequency        10-30                 Kilohertz      KHz
   Conducted            Range
   Transients           V rms into       1000                  Volts          V
                        50 ohms
   Narrowband           Frequency        0.01-1000             megahertz      MHz
   Radiated             Range
   Susceptibility       Level            5.0                   Volts/meter    V/m
   ESD Control          Soft Failure     10.0                  kilovolts      kV
                        Hard Failure     11.5                  kilovolts      kV
                        Hardware Failure 15.0                  kilovolts      kV




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                        6.4 Table 4 - Reliability Specification
     PARAMETERS                  VALUE                       UNITS        SYMBOL
   Mean Time Between            450,000 (minimum)            hours          h
   Failures (MTBF)
   Mean Cycles Between          20 million (minimum)         cycles        c
   Failures (MCBF)
   Power-on Duty Cycle          100                          percent       %
   Functional Duty Cycle        15                           percent       %
   Overall Error Rate           1/100,000 (maximum)          characters    --




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