RAD Data comm RSD-20 operation manual Appendix a, Table A.1 X21 Interface Signal Description

Page 28

 

 

APPENDIX A

 

 

 

Table A.1

 

 

X21 Interface Signal Description

 

 

 

 

X.21

 

SIGNAL NAME

PIN

 

 

 

 

 

 

SHIELD

1

 

 

 

 

G

 

GROUND

8

 

 

 

 

T

 

TRANSMIT

2

 

 

 

9

 

 

 

 

R

 

RECEIVE

4

 

 

 

11

 

 

 

 

C

 

CONTROL

3

 

 

 

10

 

 

 

 

I

 

INDICATION

5

 

 

 

12

 

 

 

 

S

 

SIGNAL TIMING

6

 

 

 

13

 

 

 

 

-

 

EXTERNAL CLOCK

7

 

 

 

14

 

 

 

 

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Contents RSD-20 DUUDQW\ 6DIHW\DUQLQJV HFODUDWLRQRI&RQIRUPLW\ Table of Contents General IntroductionFunctional Description Specifications Indicators PowerOrdering PhysicalInstallation Physical InstallationElectrical Installation AC PowerRear Panel Internal Switches and Strap SelectionRear Panel Installation Installation System Synchronization and Clock Distribution RSD-20/V.35Synchronization on Main Channel Modem Clock Synchronization on Main Channel Modem’s ClockSynchronization on RSD-20 Internal Clock Synchronization on Internal ClockRSD-20 Synchronization on Sub-channelRSD-20/X.21 External Clock for more than one Sub-channelMain channel is DTE attached to a modem Main and all sub-channels are DCE attached to DTEsMain channel is DCE and sub-channels are mixed DTE and DCE Operation Controls and IndicatorsFront Panel Operating Procedure Power Turn OnPower Turn Off OperationFault Isolation Procedure Power SupplyOperational Field Strapping Changes RSD MalfunctionContention SUB-CHANNEL DisableTheory of Operation and Applications IntroductionControl Signals Main Channel Control SignalsSub-channel Control Signals RSD-20/V.35RSD-20/X.21 Theory of Operation and Applications RSD-20 Operators Manual Theory of Operation and Applications Applications RSD-20 Operating ModesTable A.1 X21 Interface Signal Description Appendix aTable B.1 Interface Signal Description Appendix B
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