RAD Data comm RSD-20 operation manual Rear Panel, Internal Switches and Strap Selection

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INSTALLATION

RSD-20 OPERATOR'S MANUAL

2.4.2 Rear Panel

Six connectors are located on the rear panel of the RSD-20, consisting of five channel connectors (four for the sub-channels and one for the main channel) and one 3-pin power connector, which also includes the fuse holder. The five channel connectors are 34-pin connectors for the V.35 interface or 15-pin, D-type for the X.21 interface. The ON/OFF power switch and the 110/220 VAC selection switch are located also on the rear panel (see Figure 2.1).

2.4.3 Internal Switches and Strap Selection

The internal switches and straps on the RSD-20 should be configured to meet system requirements. In order to change the settings, the following steps should be followed:

a)Disconnect the AC power cable.

b)Remove the RSD-20 top cover, loosen the two screws on the rear panel and slide back the top cover.

c)Identify the straps according to Table 2.1 and Figures 2.3 and 2.4.

POWER

MAIN CHANNEL

SUB CHAN. 4

SUB CHAN. 3

SUB CHAN. 2

SUB CHAN. 1

~230V~115V F-0.400A S.B.

Figure 2.1

Rear Panel

d)Install the straps/switches in the required position.

e)Reinstall the top cover.

CAUTION Disconnect the instrument from the input line power before removing covers.

2.2

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Contents RSD-20 DUUDQW\ 6DIHW\DUQLQJV HFODUDWLRQRI&RQIRUPLW\ Table of Contents General IntroductionFunctional Description 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 Operation Controls and IndicatorsFront Panel 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