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RAD Data comm RSD-20 manual

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Table of contents for the manual

  • Page 1

    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[...]

  • Page 2

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  • Page 3

    6DIHW:DUQLQJV 7KHH[FODPDWLRQSRLQWZLWKLQDWULDQJOHLVLQWHQGHGWRZDUQWKHRSHUDWRURU VHUYLFHSHUVRQQHORIRSHUDWLRQDQGPDLQWHQDQFHIDFWRUVUHODWLQJWRWKH SURGXFWDQGLWVRSHUDWLQJHQYLURQPHQWZKLFKFRXOGSRVHDVDIHWKD]DUG $OZDVREVHUYHVWDQGDUGVDIHWSUHFDXWLRQ[...]

  • Page 4

    'HFODUDWLRQRI&RQIRUPLW 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 disturbanc[...]

  • Page 5

    TABLE OF CONTENTS 1 INTRODUCTION 1 . 1 G e n e r a l ... ........ ........ ........ ........ .... 1 . 1 1 . 2 F u n c t i o n a l D e s c r i p t i o n ........ ........ ........ ........ 1 . 1 1 . 3 S p e c i f i c a t i o n s ...... .......... ........ ........ .... 1 . 2 1 . 4 O r d e r i n g... ........ ........ ........ ........ .... 1 . 3 2 I[...]

  • Page 6

    1 INTRODUCTION 1.1 GENERAL The RSD-20, Hi gh Speed Digital Shar ing Device, enables up to four high speed m odems, terminals or c ontrollers to shar e a master modem, a mul tiplexer or a computer por t in a multipoint envi ronment. The R SD-20 is compa tible with synchronous equi pment at data rat es of 48, 56, or 64 kbps, with V.35 or X.2 1 interf[...]

  • Page 7

    1.3 SPECIFICATIONS Number of S ub-channels Four Channel Configu ration Lowest priority: Sub-channel 1 Highest pri ority: Sub-channel 4 Sub-channel Select ion Strap-select able to: Control sign al RTS/DCD (V.35) or CONT/IND (X.21) ON Data transit ions Sub-channel Deselection RTS/DCD (V.35) or CON T/IND (X .21) OFF (in control cont ention) 16 bits of[...]

  • Page 8

    Indicators DATA: Display data br oadcast fr om main channel to sub- channels ACTIVITY: 4 LEDs indicat e which sub-cha nnel has gained access to main cha nnel DISABLE: 4 LEDs indicate if sub-channel has been disa bled automatica lly ON: RSD pow er is on Power 115/230 VAC swi tchable;  10%; 47- 63 Hz; 10 W Physical Height: 44 mm / 1.7 in (1U ) Wid[...]

  • Page 9

    2 INSTALLATION Access inside the equipment is only per mitted to author ized service personnel. 2.1 GENERAL This chapte r provides inf ormation on pe rforming the mechanica l and electrical i nstallation of the RSD- 20. After instal lation has been complete d, refer to Chapt er 3 for operatin g information and system checkout to assure normal opera[...]

  • Page 10

    2.4.2 Rear P anel Six connectors ar e located on the rear panel of the RS D-20, consisting of fi ve channel connectors (four f or the sub-channels and one f or the main channel) and one 3-pin pow er connector, whi ch also includes the fuse holder. Th e five channel connectors ar e 34-pin connectors for the V. 35 interface or 15- pin, D-type f or th[...]

  • Page 11

    RSD-2 0 OPER ATOR' S MANU AL INSTAL LATION 2.3[...]

  • Page 12

    INSTAL LATION RSD-2 0 OPERATO R'S MANU AL 2.4[...]

  • Page 13

    2.5 SYSTEM SYNCHRONIZATION AND CLOCK DISTRIBUTION 2.5.1 RSD-2 0/V.35 Four alternatives are available for synchronization of the system: a) Main channel modem timing signa ls. b) RSD-20 int ernal clock. c) Sub-channel 1 modem timing signal s. d) Any sub-channel modem timing signals. For this t he optional buffer is required . 2.5.1.1 Sync hronizatio[...]

  • Page 14

    2.5.1.2 Sync hronization on RS D-20 Inter nal Clock a) RSD-20 baud rat e should be strapped to the requir ed speed. b) DCEs attached to sub- channels should be strapped to external clock. c) DCE attached to main channel should be str apped to external clock. RSD-20 DCE EXT . CK DTE EXT . CK DCE EXT . CK DTE TX. CLK TX. CLK TX. CLK EXT . CLK EXT . C[...]

  • Page 15

    2.5.1.3 Sync hronization on Sub-channe l 1 a) RSD-20 baud rat e should be strapped to CLK- 1. b) DCE attached to main channe l should be strapped to exter nal clock. c) DCEs attached to sub-channel 1 should be strapped to int ernal clock. NOTE Synchronization on sub -channel 1 is not recomme nded when the modem connected to sub-channel 1 operates i[...]

  • Page 16

    2.5.1.4 Ext ernal Clock for more than one Sub-c hannel This option enables connect ion of more than one sub-chann el 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 t he clock. Since the modems are al l from the same service, the clocks are synchronized . The external[...]

  • Page 17

    2.5.2.4 Main c hannel is DCE and sub-c hannels are mixed (DTE and DCE) In this mode one of the modem s attached t o the sub-channel s (configured as DTE ) should be attached t o sub-channel 1, and t he RSD baud rate should be st rapped to CLK-1. The DTEs attache d to the main and sub-ch annels are synchronized to the R SD ’ sc l o c k ;t h e mode[...]

  • Page 18

    3 OPERATION 3.1 GENERAL This chapte r details th e RSD-20 controls and indicators, their function s, and oper ating procedures. The installation procedure s given in Chapter 2 must be complet ed and checked before operation of the RSD-20 is attempte d. NOTE For an explanation of all the possible system insta llations of the RSD-20, refer to Chapter[...]

  • Page 19

    Table 3. 1 Control Fun ctions Control Location Function Power switch (with lamp ) ON/OFF Rear Panel Turns AC power ON or OFF 110/220 VAC Selecto r Rear Panel Selects main powe r source: 115 or 230 VAC Four manual DISABLE push-button switches Front Panel Manually deacti vates sub-channels connected to defective termi nals or modems. A depressed push[...]

  • Page 20

    3.4 OPERATIONAL FIELD STRAPPING CHANGES Access inside the equipment is only per mitted to author ized service personnel. If it becomes necessary to reconf igure the RSD- 20 for a different type of operati on, the internal straps must be ch anged to correspond to the new oper ating mode. For guidance in repo sitioning the straps, r efer to the infor[...]

  • Page 21

    4 THEORY OF OPERATION AND APPLICATIONS 4.1 INTRODUCTION This chapter contains a simplified functional d escription of the RS D-20, and cover s the flow of data, contr ols and clocks in all RSD- 20 operating modes. 4.2 CONTENTION RTS/DC D contention in V.35 in terface is interc hangeable with CO NTROL/I NDICATI ON contention fo r X.21 interfa ce. Su[...]

  • Page 22

    4.4 CONTROL SIGNALS Sub-channel control s ignals are c ombined to p rovide a com posite signal to the main channel. Control s ignals from th e main channel are passed t o all sub-channel s in parallel. The following are det ails of control signals: 4.4.1 Main Channel Control Si gnals 4.4.1.1 RS D-20/V. 35 RTS (DCD) In RTS/DCD (CONTROL/INDICATION) c[...]

  • Page 23

    4.4.2.2 RS D-20/X. 21 CONTROL/INDICATION If the “ C/I to Sub-channel ” jumper is in t he “ MAIN CHANNEL ” state, the C /I to sub-channel follows the main C/ I (unless the sub-channel is disabled, t hen the C/I is OFF). If the “ C/I to sub-channel is i n the ” ON" st ate, all of the sub-ch annels ’ C/O are “ ON ” irrespective [...]

  • Page 24

    THEORY OF OPERATION AND APP LICATIONS RSD-20 OPERATOR'S MANUA L 4.3[...]

  • Page 25

    Figure 4. 1 Main Chan nel DTE with Sub-ch annel DCE Figure 4. 2 Main Channel DCE with Sub-channel DTE RSD-20 OPERATOR'S MA NUAL THEORY OF OPERATIO N AND APPLICATIONS 4.4[...]

  • Page 26

    Figure 4.4 Main channel DCE w ith Sub-channel DCE Figure 4.3 Main channel DTE wi th Sub-channel DTE THEORY OF OPERATION AND APP LICATIONS RSD-20 OPERATOR'S MANUA L 4.5[...]

  • Page 27

    4.5 APPLICATIONS The RSD-20 operat es in one of six modes: modem sharing, port shari ng, remote port shar ing, local port sharing, mix mo dem sharing and mix port sharing. S ystem configurati ons incorporating the RSD- 20 in each operating mode are describ ed in Figure 4.1. The following should be taken into consideration when configuring an RSD-20[...]

  • Page 28

    APPENDIX A Table A.1 X21 Interface Si gnal Descripti on X.21 SIGNAL NAME PIN SHIELD 1 G GROUND 8 T TRANSMIT 2 9 R RECEIVE 4 11 CC O N T R O L 3 10 I INDICATION 5 12 S SIGNAL TIMIN G 6 13 - EXTERNAL CLOCK 7 14[...]

  • Page 29

    APPENDIX B Table B.1 V.35 I nterface Signa l Descripti on V.35 Signal Function 34-pin Stand-Alone Pin Circu it Protective Ground A Frame 101 Signal Ground B Signal GND 102 Transmit ted Data S TD(B ) 103 PT D ( A ) 1 0 3 Received Data R RD(A) 104 T RD(B) 104 Request to Send C RTS 105 Clear to Send D CTS 106 Data Set Ready E DSR 107 Data Terminal Rea[...]