RAD Data comm operation manual RSD-20/X.21

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RSD-20 OPERATOR'S MANUAL

THEORY OF OPERATION AND APPLICATIONS

4.4.2.2 RSD-20/X.21

CONTROL/INDICATION

If the “C/I to Sub-channel” jumper is in the “MAIN CHANNEL” state, the C/I to sub-channel follows the main C/I (unless the sub-channel is disabled, then the C/I is OFF). If the “C/I to sub-channel is in the ”ON" state, all of the sub-channels’ C/O are “ON” irrespective of the main channel C/I.

4.2

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Contents RSD-20 DUUDQW\ 6DIHW\DUQLQJV HFODUDWLRQRI&RQIRUPLW\ Table of Contents Functional Description IntroductionGeneral Specifications Physical IndicatorsPower OrderingAC Power InstallationPhysical Installation Electrical InstallationRear Panel Internal Switches and Strap SelectionRear Panel Installation Installation Synchronization on Main Channel Modem’s Clock System Synchronization and Clock DistributionRSD-20/V.35 Synchronization on Main Channel Modem ClockSynchronization on Internal Clock Synchronization on RSD-20 Internal ClockSynchronization on Sub-channel RSD-20Main and all sub-channels are DCE attached to DTEs RSD-20/X.21External Clock for more than one Sub-channel Main channel is DTE attached to a modemMain channel is DCE and sub-channels are mixed DTE and DCE Front Panel Controls and IndicatorsOperation Operation Operating ProcedurePower Turn On Power Turn OffRSD Malfunction Fault Isolation ProcedurePower Supply Operational Field Strapping ChangesIntroduction ContentionSUB-CHANNEL Disable Theory of Operation and ApplicationsRSD-20/V.35 Control SignalsMain Channel Control Signals Sub-channel Control SignalsRSD-20/X.21 Theory of Operation and Applications RSD-20 Operators Manual Theory of Operation and Applications RSD-20 Operating Modes ApplicationsAppendix a Table A.1 X21 Interface Signal DescriptionAppendix B Table B.1 Interface Signal Description