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TABLE OF CONTENTS
1 INTRODUCTION
1.1 General ....................................... 1.1
1.2 FunctionalDescription................................ 1.1
1.3 Specifications .................................... 1.2
1.4 Ordering....................................... 1.3
2 INSTALLATION
2.1 General ....................................... 2.1
2.2 SitePreparation................................... 2.1
2.3 PhysicalInstallation................................. 2.1
2.4 ElectricalInstallation................................. 2.1
2.5 SystemSynchronizationandClockDistribution................... 2.5
3 OPERATION
3.1 General ....................................... 3.1
3.2 ControlsandIndicators ............................... 3.1
3.3 Operating Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2
3.4 Operational Field Strapping Changes . . . . . . . . . . . . . . . . . . . . . . . . 3.3
3.5 FaultIsolationProcedure .............................. 3.3
4 THEORY OF OPERATION AND APPLICATIONS
4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1
4.2 Contention...................................... 4.1
4.3 Sub-channel Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1
4.4 ControlSignals ................................... 4.2
4.5 Applications ..................................... 4.6
APPENDIX A X.21 INTERFACE SIGNAL DESCRIPTION
APPENDIX B X.35 INTERFACE SIGNAL DESCRITPION
FIGURES
Figure2.1 RearPanel.................................. 2.2
Figure2.2 SD-20/V.35PCBoardLayout ........................ 2.4
Figure2.3 RSD-20/X.21PCBoardLayout ....................... 2.4
Figure 2.4 Synchronization on Main Channel Modem’s Clock . . . . . . . . . . . . . 2.5
Figure 2.5 Synchronization on Internal Clock . . . . . . . . . . . . . . . . . . . . . . 2.6
Figure 2.6 Synchronization on Sub-channel 1 . . . . . . . . . . . . . . . . . . . . . 2.7
Figure3.1 FrontPanel ................................. 3.1
Figure 4.1 Main Channel DTE with Sub-channel DCE . . . . . . . . . . . . . . . . . 4.4
Figure 4.2 Main Channel DCE with Sub-channel DTE . . . . . . . . . . . . . . . . . 4.4
Figure 4.3 Main Channel DTE with Sub-channel DTE . . . . . . . . . . . . . . . . . 4.5
Figure 4.4 Main Channel DCE with Sub-channel DCE . . . . . . . . . . . . . . . . . 4.5
Figure4.5 RSD-20OperatingModes.......................... 4.6
TABLES
Table2.1 PCBoardSwitchandStrapSelection.................... 2.3
Table3.1 ControlFunctions .............................. 3.2
Table3.2 IndicatorFunctions.............................. 3.2
Table A.1 X21 Interface Signal Description . . . . . . . . . . . . . . . . . . . . . . . A.1
TableB.1 V.35InterfaceSignalDescription ......................B.1