RAD Data comm RSD-20 Site Preparation, Physical Installation, Electrical Installation

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2

INSTALLATION

Access inside the equipment is only permitted to authorized service personnel.

2.1GENERAL

This chapter provides information on performing the mechanical and electrical installation of the RSD-20. After installation has been completed, refer to Chapter 3 for operating information and system checkout to assure normal operation.

2.2SITE PREPARATION

The RSD-20 must be installed within 1.5 m (5 feet) of a grounded AC outlet, and within 15 m (50 feet) of the associated data terminals or modems.

Allow at least 90 cm (36 in) of frontal clearance for operating and maintenance accessibility. Ensure that there is a minimum of 10 cm (4 in) clearance at the end of the unit for power and interface cables.

2.3PHYSICAL INSTALLATION

The RSD-20 is designed for placement on a table-top, or for mounting onto a 19" rack. It is equipped with special brackets already assembled for mounting. These brackets can be easily removed as follows:

1.Disconnect the power cord.

2.Unfasten the rear panel screw and slide back the top cover.

3.Unfasten the two screws from the bracket and remove the single bolt.

2.4ELECTRICAL INSTALLATION

2.4.1 AC Power

AC power is supplied to the RSD-20 through a 1.5 m (5 ft) cord terminated by a grounded 3-prong plug. The AC cord is fused at the rear panel of the unit. A 0.4A slow-blow fuse is required.

2.1

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Contents RSD-20 DUUDQW\ 6DIHW\DUQLQJV HFODUDWLRQRI&RQIRUPLW\ Table of Contents Introduction GeneralFunctional Description Specifications Power IndicatorsOrdering PhysicalPhysical Installation InstallationElectrical Installation AC PowerInternal Switches and Strap Selection Rear PanelRear Panel Installation Installation RSD-20/V.35 System Synchronization and Clock DistributionSynchronization on Main Channel Modem Clock Synchronization on Main Channel Modem’s ClockSynchronization on Internal Clock Synchronization on RSD-20 Internal ClockSynchronization on Sub-channel RSD-20External Clock for more than one Sub-channel RSD-20/X.21Main 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 Controls and Indicators OperationFront Panel Power Turn On Operating ProcedurePower Turn Off OperationPower Supply Fault Isolation ProcedureOperational Field Strapping Changes RSD MalfunctionSUB-CHANNEL Disable ContentionTheory of Operation and Applications IntroductionMain Channel Control Signals 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 RSD-20 Operating Modes ApplicationsAppendix a Table A.1 X21 Interface Signal DescriptionAppendix B Table B.1 Interface Signal Description