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RSD-20
High Speed Digital Sharing Device
Installation and Operation Manual
Notice
This manual contains information that is proprietary to RAD Data Communications. No part of this
publication may be reproduced in any form whatsoever without prior written approval by RAD
Data Communications.
No representation or warranties for fitness for any purpose other than what is specifically
mentioned in this manual is made either by RAD Data Communications or its agents.
For further information contact RAD
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$ Manufacturer’s Name: RAD Data Communications Ltd. Manufacturer’s Address: 12 Hanechoshet St. Tel Aviv 69710 Israel declares that the product: Product Name: RSD-10 Conforms to the following standard(s) or other normative document(s): EMC: EN 55022 (1994) Limits and methods of measurement of radio disturbance characteristics of information technology equipment. EN 50082-1 (1992) Electromagnetic compatibility - Generic immunity standards for residential, commercial and lig
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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 . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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1 INTRODUCTION 1.1 GENERAL The RSD-20, High Speed Digital Sharing Device, enables up to four high speed modems, terminals or controllers to share a master modem, a multiplexer or a computer port in a multipoint environment. The RSD-20 is compatible with synchronous equipment at data rates of 48, 56, or 64 kbps, with V.35 or X.21 interface. 1.2 FUNCTIONAL DESCRIPTION The main channel transmits information to all sub-channels in parallel. Sub-channels contend to transmit to the main channel by act
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RSD-20 OPERATOR'S MANUAL INTRODUCTION 1.3 SPECIFICATIONS Number of Sub-channels Four Channel Configuration Lowest priority: Sub-channel 1 Highest priority: Sub-channel 4 Sub-channel Selection Strap-selectable to: Control signal RTS/DCD (V.35) or CONT/IND (X.21) ON Data transitions Sub-channel Deselection RTS/DCD (V.35) or CONT/IND (X.21) OFF (in control contention) 16 bits of idle data (in data contention) Sub-channel Disabling Manual: Via front panel switches Automatic: If sub-channel stays con
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INTRODUCTION RSD-20 OPERATOR'S MANUAL Indicators DATA: Display data broadcast from main channel to sub-channels ACTIVITY: 4 LEDs indicate which sub-channel has gained access to main channel DISABLE: 4 LEDs indicate if sub-channel has been disabled automatically ON: RSD power is on Power 115/230 VAC switchable; 10%; 47-63 Hz; 10 W Physical Height: 44 mm / 1.7 in (1U) Width: 431 mm / 17.0 in Depth: 208 mm / 8.2 in Weight: 2 kg / 4.4 lb Environment o o Temperature: 0-50 C/32-122 F Humidity: Up to
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2 INSTALLATION Access inside the equipment is only permitted to authorized service personnel. 2.1 GENERAL 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. 2.2 SITE 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
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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
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RSD-20 OPERATOR'S MANUAL INSTALLATION 2.3
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INSTALLATION RSD-20 OPERATOR'S MANUAL 2.4
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RSD-20 OPERATOR'S MANUAL INSTALLATION 2.5 SYSTEM SYNCHRONIZATION AND CLOCK DISTRIBUTION 2.5.1 RSD-20/V.35 Four alternatives are available for synchronization of the system: a) Main channel modem timing signals. b) RSD-20 internal clock. c) Sub-channel 1 modem timing signals. d) Any sub-channel modem timing signals. For this the optional buffer is required. 2.5.1.1 Synchronization on Main Channel Modem Clock a) Main channel modem – strapped to internal clock. b) DCEs attached to sub-channels are
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SUB-CHANNEL INSTALLATION RSD-20 OPERATOR'S MANUAL 2.5.1.2 Synchronization on RSD-20 Internal Clock a) RSD-20 baud rate should be strapped to the required speed. b) DCEs attached to sub-channels should be strapped to external clock. c) DCE attached to main channel should be strapped to external clock. EXT. CLK RSD-20 EXT. CLK DCE DCE SUB DTE EXT. CK EXT. CK TX. CLK MAIN DTE TX. CLK SUB DCE DTE TX. CLK DTE MAIN EXT. CK DTE Figure 2.5 Synchronization on Internal Clock 2.6
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RSD-20 OPERATOR'S MANUAL INSTALLATION 2.5.1.3 Synchronization on Sub-channel 1 a) RSD-20 baud rate should be strapped to CLK-1. b) DCE attached to main channel should be strapped to external clock. c) DCEs attached to sub-channel 1 should be strapped to internal clock. NOTE Synchronization on sub-channel 1 is not recommended when the modem connected to sub-channel 1 operates in switched carrier mode, as it causes fluctuations in clock frequency and phase. EXT. CLK RSD-20 RCV. CLK DCE DCE DCE MAI
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INSTALLATION RSD-20 OPERATOR'S MANUAL 2.5.1.4 External Clock for more than one Sub-channel This option enables connection of more than one sub-channel to the line from the P.T.T. service. Generally, the P.T.T. modems supply clock to every line – i.e. the P.T.T. has to provide the clock. Since the modems are all from the same service, the clocks are synchronized. The external buffer will compensate for phase differences between the clocks received from the sub-channels. However, the external buff
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RSD-20 OPERATOR'S MANUAL INSTALLATION 2.5.2.4 Main channel is DCE and sub-channels are mixed (DTE and DCE) In this mode one of the modems attached to the sub-channels (configured as DTE) should be attached to sub-channel 1, and the RSD baud rate should be strapped to CLK-1. The DTEs attached to the main and sub-channels are synchronized to the RSD’sclock;the modems attached to the sub-channels are synchronized to their own clock; and the internal buffer compensates for the phase difference betwe
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3 OPERATION 3.1 GENERAL This chapter details the RSD-20 controls and indicators, their functions, and operating procedures. The installation procedures given in Chapter 2 must be completed and checked before operation of the RSD-20 is attempted. NOTE For an explanation of all the possible system installations of the RSD-20, refer to Chapter 4. 3.2 CONTROLS AND INDICATORS SUB-CHANNEL DISABLE RAD RSD-20 AUTOMATIC ACTIVITY 1234 POWER DATA 1234 1234 Figure 3.1 Front Panel Four controls and ten indic
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RSD-20 OPERATOR'S MANUAL OPERATION Table 3.1 Control Functions Control Location Function Power switch (with lamp) ON/OFF Rear Panel Turns AC power ON or OFF 110/220 VAC Selector Rear Panel Selects main power source: 115 or 230 VAC Four manual DISABLE push-button switches Front Panel Manually deactivates sub-channels connected to defective terminals or modems. A depressed push button disables the sub-channel Table 3.2 Indicator Functions Indicator Functions Power Green LED is ON when power is pre
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OPERATION RSD-20 OPERATOR'S MANUAL 3.4 OPERATIONAL FIELD STRAPPING CHANGES Access inside the equipment is only permitted to authorized service personnel. If it becomes necessary to reconfigure the RSD-20 for a different type of operation, the internal straps must be changed to correspond to the new operating mode. For guidance in repositioning the straps, refer to the information given in Chapter 2 of this manual. It is recommended that the straps be changed by an experienced technician. CAUTION
