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Contents RSD-20 DUUDQW\ 6DIHW\DUQLQJV HFODUDWLRQRI&RQIRUPLW\ Table of Contents Functional Description IntroductionGeneral Specifications Ordering IndicatorsPower PhysicalElectrical Installation InstallationPhysical Installation AC PowerRear Panel Internal Switches and Strap SelectionRear Panel Installation Installation Synchronization on Main Channel Modem Clock System Synchronization and Clock DistributionRSD-20/V.35 Synchronization on Main Channel Modem’s ClockSynchronization on RSD-20 Internal Clock Synchronization on Internal ClockRSD-20 Synchronization on Sub-channelMain channel is DTE attached to a modem RSD-20/X.21External Clock for more than one Sub-channel Main and all sub-channels are DCE attached to DTEsMain channel is DCE and sub-channels are mixed DTE and DCE Front Panel Controls and IndicatorsOperation Power Turn Off Operating ProcedurePower Turn On OperationOperational Field Strapping Changes Fault Isolation ProcedurePower Supply RSD MalfunctionTheory of Operation and Applications ContentionSUB-CHANNEL Disable IntroductionSub-channel Control Signals Control SignalsMain 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