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RAD Data comm ASM-20 manuel d'utilisation

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Tout d'abord, il contient la réponse sur la structure, les possibilités du dispositif RAD Data comm ASM-20, l'utilisation de divers accessoires et une gamme d'informations pour profiter pleinement de toutes les fonctionnalités et commodités.

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Table des matières du manuel d’utilisation

  • Page 1

    ASM-20 Synchronous/Asynchronous Short Range Modem Installation and Operation Manual Notice This manual c ont ai ns i nfor mation that is prop rietary to RA D D at a Communi cati ons. No part of this p u blicat io n m ay b e r e p r od u ce d in an y fo r m wh at so e ver wit h ou t p r ior wr it t e n ap p r o val by R AD Dat a Communications. No r[...]

  • Page 2

    [...]

  • Page 3

    Warranty This RAD product is warranted against defects in material and workmanship for a period of one year from date of shipment. During the warranty period, RAD will, at its option, either repair or replace products which prove to be defective. For warranty service or repair, this product must be returned to a service facility designated by RAD. [...]

  • Page 4

    Safety Warnings The exclamation point within a triangle is intended to warn the operator or service personnel of operation and maintenance factors relating to the product and its operating environment which could pose a safety hazard. Always observe standard safety precautions during installation, operation and maintenance of this product. Only a q[...]

  • Page 5

    Regulatory Information FCC-15 User Information This equipment has been tested and found to comply with the limits of the Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment gene[...]

  • Page 6

    Declaration of Conformity Manufacturer’s Name: RAD Data Communications Ltd. Manufacturer’s Address: 12 Hanechoshet St. Tel Aviv 69710 Israel declares that the product: Product Name: ASM-20 Conforms to the following standard(s) or other normative document(s): EMC: EN 55022 (1994) Limits and methods of measurement of radio disturbance characteris[...]

  • Page 7

    20/4/99 11:47 Installing and Operating ASM-20 1 Quick-Start Guide 1 . Installing and Operating ASM-20 If you are familiar with ASM-20, use this guide to prepare it for operation. Perform the following steps for both the local and the remote units. 1. Disconnect all cables from the units. 2. Open the units. 3. Adjust the jumpers. See Chapter 2, Inst[...]

  • Page 8

    Preface Foreword This manual provides information on the technical characteristics, installation and operating instructions of ASM-20. The manual contains the following information: Chapter 1. Introduction describes ASM-20 and its applications, features, options, physical and functional descriptions and technical specifications. Chapter 2. Installa[...]

  • Page 9

    Conventions Note A note draws attention to a general rule for a procedure, or to exceptions to a rule. Caution A caution warns of possible damage to the equipment if a procedure is not followed correctly. Warning A warning alerts to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the equip[...]

  • Page 10

    ASM-20 Installation and Operation Manual i Contents CHAPTER 1 INTRODUCTION 1.1 Overview ................................................................................................................... .... 1-1 Applications .......................................................................................................................... 1[...]

  • Page 11

    Contents ii ASM-20 Installation and Operation Manual 3.2 Controls and Indicators ................................................................................................... 3 -1 3.3 Operating Instructions .................................................................................................... 3-3 Power On Procedure .............[...]

  • Page 12

    ASM-20 Installation and Operation Manual iii List of Figures Figure 1-1 Point-to-point Application ........................................................................................ ... 1-1 Figure 1-2 G.703 Modem Link Application .................................................................................. 1-2 Figure 1-3 Tail-end for Dig[...]

  • Page 13

    ASM-20 Installation and Operation Manual iv List of Tables Table 1-1 Approximate Range ....................................................................................................... 1-9 Table 2-1 ASM-20 Strap Selection Settings .................................................................................... 2 -5 Table 2-2 Async Charact[...]

  • Page 14

    6/4/99 13:10 Overview 1 - 1 Chapter 1 Introduction 1 . 1 Overview The ASM-20 Short Range Modem operates synchronously or asynchronously at full or half duplex, over unconditioned lines. ASM-20 has a range of up to 23 km (14 miles) and operates at selectable data rates from 19.2 kbps to 256 kbps. AS M-20 uses conditioned diphase modulation (EUROCOM [...]

  • Page 15

    Chapter 1. Introduction ASM-20 Installation and Operation Manual 1 - 2 Overview 6/4/99 13:10 G. 70 3 DI G I T AL SERVI C E NETWORK ASM - 20 EXT C LK ASM - 20 RCV CL K RAD RAD Te r m i n a l ASM - 20 EXT C LK ASM - 20 RCV CL K RAD RAD DT E Figure 1- 2 G.703 Modem Link Application ASM - 20 G . 703 or X. 21/ R S- 53 0/ V . 24 or V . 35 o r ETH DT E RA[...]

  • Page 16

    ASM-20 Installation and Operation Manual Chapter 1. Introduction 6/4/99 13:10 Physical Description 1 -3 Connection to an RS-449/V.36 interface is accomplished via the RS-530 interface (see Appendix A, Ethernet Interface ). ASM-20 incorporates a built-in Bit Error Rate Tester (BERT). The internal BERT allows complete testing of both modems and the l[...]

  • Page 17

    Chapter 1. Introduction ASM-20 Installation and Operation Manual 1 -4 Functional Description 6/4/99 13:10 GND RCV XM T DTE 100 - 1 1 5 V A C -0 .2 A T 2 5 0 V ~ 2 3 0 V / 0 .1 A T 2 5 0 V Figure 1- 5 ASM-20 Rear Panel with V.35 Interface 1 . 3 Functional Description This section contains functional descriptions of the circuit blocks in ASM-20, prim[...]

  • Page 18

    ASM-20 Installation and Operation Manual Chapter 1. Introduction 6/4/99 13:10 Functional Description 1 -5 Modulation Timing This circuit supplies the transmit clock to the encoder. Three clock sources are available: • Internal oscillator • External from the DTE • Loop clock derived from the receive signal. Setting the XMT CLK jumper determine[...]

  • Page 19

    Chapter 1. Introduction ASM-20 Installation and Operation Manual 1 -6 Technical Specifications 6/4/99 13:10 characters. The remote converter will add a shorter stop bit (shorter by 12.5% or 25%) before sending the data to the remote DTE. A suitable operation of the ASYNC to SYNC converter is selected by adjusting the proper character length and fre[...]

  • Page 20

    ASM-20 Installation and Operation Manual Chapter 1. Introduction 6/4/99 13:10 Technical Specifications 1 -7 Digital Interface Type • V.24/RS-232 via 25-pin D-type, (up to 64 kbps only), female connector • V.35 via 34-pin female connector • X.21 via 15-pin D-type female connector • RS-530 (RS-422) via 25-pin D-type female connector • V.36 [...]

  • Page 21

    Chapter 1. Introduction ASM-20 Installation and Operation Manual 1 -8 Technical Specifications 6/4/99 13:10 Indicators Power PWR (green) Request to Send RTS (yellow) Transmit Data TD (yellow) Receive Data RD (yellow) Data Carrier Detect DCD (yellow) Test TEST (red) Bit errors Err (yellow) Electrical Power Supply 115 or 230 V ( ± 10%) 47 to 63 Hz; [...]

  • Page 22

    ASM-20 Installation and Operation Manual Chapter 1. Introduction 6/4/99 13:10 Technical Specifications 1 -9 Table 1- 1 Approximate Range Baud Rate 19 AWG (0.8 mm) 22 AWG (0.6 mm) 24 AWG (0.5 mm) 26 AWG (0.4 mm) kbps km miles km miles km miles km miles 256 3.75 2.3 2.85 1.75 2.25 1.4 1.9 1.2 192 6.0 3.7 4.5 2.8 3.5 2.2 2.7 1.7 144 10.6 6.6 6.75 4.2 [...]

  • Page 23

    Chapter 1. Introduction ASM-20 Installation and Operation Manual 1-10 Technical Specifications 6/4/99 13:10[...]

  • Page 24

    11/4/99 14:09 Site Preparation and Prerequisites 2 -1 Chapter 2 Installation and Setup 2 . 1 Introduction This chapter provides instructions for mechanical and electrical installation of the ASM-20 standalone model. For rack installation of the ASM-20, see Chapter 5, Card Cage Version . Section 2.2 describes site preparation for ASM-20. Section 2.3[...]

  • Page 25

    Chapter 2. Installation and Setup ASM-20 Installation and Operation Manual 2 -2 Electrical Installation 11/4/99 14:09 2 . 3 Package Contents The ASM-20 package includes the following items: • ASM-2 0 • AC cord • 48 VDC plug (optional) • Adapter cable for the different interfaces (optional) • AS M-20 Installation and Operation Manual. 2 . [...]

  • Page 26

    ASM-20 Installation and Operation Manual Chapter 2. Installation and Setup 11/4/99 14:09 Electrical Installation 2- 3 ~230 V AC -1A T 250V DTE X.21 Line C on nect or Figure 2- 2 A S M -20 - X.21 Rear Panel Strap Selection Before connecting power to the unit, determine the required configuration of ASM-20 and position the straps accordingly. The PCB[...]

  • Page 27

    Chapter 2. Installation and Setup ASM-20 Installation and Operation Manual 2 -4 Electrical Installation 11/4/99 14:09 BAUD RA TE kbps IN T EXT RC V ASY XMT CL K CH ASS DI S CON RTS-CTS DL Y ( m s) 0 9 70 0 - 256 1 - 192 2 - 144 3 - 128 4 - 1 15.2 5 - 1 12 6 - 96 7 - 72 8 - 64 9 - 57. 6 A - 56 B - 48 C - 38.4 D - 32 E - 2 8. 8 F - 19. 2 V5 4 DI S EN[...]

  • Page 28

    ASM-20 Installation and Operation Manual Chapter 2. Installation and Setup 11/4/99 14:09 Electrical Installation 2- 5 Table 2- 1 ASM -20 Strap Selection Settings Jumper and Switch Identity Function Possible Settings Factory Setting J1 V54 DIS Prevents activation of remote V.54 loops. EN DIS EN J2 CARRIER Selects the transmit carrier mode. When ON, [...]

  • Page 29

    Chapter 2. Installation and Setup ASM-20 Installation and Operation Manual 2 -6 Electrical Installation 11/4/99 14:09 Table 2 - 1 ASM -20 Strap Selection Settings (Cont.) Jumper and Switch Identity Function Possible Settings Factory Setting SW2 ASYNC LENGTH (3 dip switches) Select character length in async mode (see Table 2-2 for further explanatio[...]

  • Page 30

    ASM-20 Installation and Operation Manual Chapter 2. Installation and Setup 11/4/99 14:09 Electrical Installation 2- 7 Power Connection AC power is supplied to ASM-20 through a standard 1.5 m (5 ft) detachable power cord terminated by a standard 3-prong plug. The power inlet on the rear panel incorporates an integral fuse. Warning Before connecting [...]

  • Page 31

    Chapter 2. Installation and Setup ASM-20 Installation and Operation Manual 2 -8 Electrical Installation 11/4/99 14:09[...]

  • Page 32

    6/4/99 13:13 Controls and Indicators 3- 1 Chapter 3 Operation 3 . 1 General This chapter: • Describes the controls and indicators of ASM-20 and their functions • Explains the operation procedures • Provides jumper and switch information. Installation procedures given in Chapter 2, Installation and Setup must be completed and checked before at[...]

  • Page 33

    Chapter 3. Operation ASM-20 Installation and Operation Manual 3- 2 Controls and Indicators 6/4/99 13:13 PW R 1 2 3 4 5 A E B C D 7 RT S TD DCD TE ST DI G ANA PAT T ERR RPF ASM - 2 0 Figure 3- 2 ASM -20R Front Panel Table 3- 1 Control and Indicator Functions Item Name Type Function A DI G Pushbutton The Digital Loopback switch causes the local ASM -[...]

  • Page 34

    ASM-20 Installation and Operation Manual Chapter 3. Operation 6/4/99 13:13 Operating Instructions 3- 3 Table 3- 1 Control and Indicator Functions (Cont.) Item Name Type Function E RPF RESET Pushbutton Resets ERR/RPF LED (only available in ASM -20/R). 1 PWR LED Indicator Green LED is on when power is on. 2 RTS LED Indicator ITU 105 Yellow LED is on [...]

  • Page 35

    Chapter 3. Operation ASM-20 Installation and Operation Manual 3 -4 Operating Instructions 6/4/99 13:13 Activation of Tests In order to verify that the ASM-20 is operating correctly, use the internal BERT and analog loopback tests as described in Bit Error Rate Tester (BERT) in Chapter 4 and Local Test - Analog Loopback in Chapter 4 . Operational Ju[...]

  • Page 36

    11/4/99 12:34 Frequently Asked Questions 4 - 1 Chapter 4 Troubleshooting and Diagnostics 4 . 1 General This chapter contains procedures for performing system diagnostic tests for AS M-20. Use the test procedures provided in this chapter to: • Verify normal system operation • Isolate faulty equipment in the event of failure. Tests are activated [...]

  • Page 37

    Chapter 4. Troubleshooting and Diagnostics ASM-20 Installation and Operation Manual 4 - 2 Bit Error Rate Tester (BERT) 11/4/99 12:34 Table 4- 1 Differences in Versions (Cont.) ASM-20 ASM-20-2 Metal box Plastic box Terminal block with screws Clip terminal block Main chip RJ008 and external BERT chip Main chip RJ016 which includes BERT chip No CE mar[...]

  • Page 38

    ASM-20 Installation and Operation Manual Chapter 4. Troubleshooting and Diagnostics 11/4/99 12:34 Bit Error Rate Tester (BERT) 4 - 3 PAT T Pr ess ed P a tte rn Gener a t or P a tte rn Te s t e r E rro r XM T RCV ASM - 20 Figure 4- 1 BERT Using Loops Alternatively, the complete link can be tested when using two ASM-20 modems or an external BERT. Fig[...]

  • Page 39

    Chapter 4. Troubleshooting and Diagnostics ASM-20 Installation and Operation Manual 4 -4 Local Test - Analog Loopback 11/4/99 12:34 4 . 5 Modem Self Test The modem self test verifies that ASM-20 is operating correctly. To verify that ASM-20 is operating correctly: 1. Press the ANA (Analog Loopback) push button on the front panel. Both the TEST and [...]

  • Page 40

    ASM-20 Installation and Operation Manual Chapter 4. Troubleshooting and Diagnostics 11/4/99 12:34 Communication Link Tests 4 -5 To check the performance of the local modem and the local data terminal: 1. Press the ANA (Analog Loopback) push button on the front panel (see Figure 3- 1 ). This test can also be activated via the pin on the DTE interfac[...]

  • Page 41

    Chapter 4. Troubleshooting and Diagnostics ASM-20 Installation and Operation Manual 4 -6 Communication Link Tests 11/4/99 12:34 3. If Step 2 indicates a fault, and if the modem test described Modem Self Test on page 4- 4 was positive for both the local and remote modems, the line circuits are not operating properly. RCVR RCVR LOC AL DA T A TE R MIN[...]

  • Page 42

    11/4/99 12:46 ASM-MN-214 Card Cage 5- 1 Chapter 5 Card Cage Version 5 . 1 General This chapter describes the ASM-20/R card version, designed for installation in the ASM-MN-214 card cage. The chapter contains the following sections: • Section 5.2 describes the ASM-MN-214 card cage • Section 5.3 describes the ASM-20/R card version • Section 5.4[...]

  • Page 43

    Chapter 5. Card Cage Version ASM-20 Installation & Operation Manual 5- 2 ASM-20/R Card Version 11/4/99 12:46 Figure 5- 1 A S M -MN-214 Rear Panel 5 . 3 ASM-20/R Card Version Figure 5-2 shows the ASM-20/R card front panel. The LEDs and switches of the card version are identical in their functionality to those of the standalone device. For this i[...]

  • Page 44

    ASM-20 Installation & Operation Manual Chapter 5. Card Cage Version 11/4/99 12:46 Power Supply 5 -3 PW R RTS TD RD DCD TEST DI G ANA REM PAT T ERR RPF ASM - 20 Figure 5- 2 ASM-20/R Front Panel 5 . 4 Power Supply Power is supplied to the ASM-20/R card from the ASM-MN-214 power supply via the chassis. Each ASM-20/R card has two fuses, which prote[...]

  • Page 45

    Chapter 5. Card Cage Version ASM-20 Installation & Operation Manual 5 -4 Installation 11/4/99 12:46 Power Supply with Redundancy This special ordering option is equipped with two separate power supplies, operating together and sharing the load of the whole card cage. If either of the power supplies fails, the other one will continue to supply p[...]

  • Page 46

    ASM-20 Installation & Operation Manual Chapter 5. Card Cage Version 11/4/99 12:46 Installation 5 -5 5 . 5 Installation To install the ASM-20/R card in the ASM-MN-214 card cage: 1. Install the ASM-MN-214 card cage in the 19" rack. 2. Adjust the jumpers and switches on the card as required (see Table 2-1 and Figure 2-3 in Chapter 2). 3. Inse[...]

  • Page 47

    Chapter 5. Card Cage Version ASM-20 Installation & Operation Manual 5 -6 Installation 11/4/99 12:46[...]

  • Page 48

    6/4/99 13:17 Description A-1 Appendix A Ethernet Interface A . 1 General This appendix: • Describes the IR-ETH for RAD modems • Describes the different IR-ETH connector options • Lists the Ethernet bridge specifications • Explains how to install and operate an Ethernet bridge. A . 2 Description The IR-ETH is an interface module for RAD mode[...]

  • Page 49

    Appendix A. Ethernet Interface ASM-20 Installation and Operation Manual A-2 IR-ETH Connector Options 6/4/99 13:17 A . 3 IR-ETH Connector Options Figure A-2 and Figure A-3 show the rear panel of ASM-20 with the IR-ETH connector options. The IR-ETH connector for the ASM-20/R card (rack mount version) is shown in Figure A-4 . Li ne Connect o r Figure [...]

  • Page 50

    ASM-20 Installation and Operation Manual Appendix A. Ethernet Interface 6/4/99 13:17 Installation and Operation A-3 A . 4 Ethernet Bridge Specifications General LAN Table 10,000 addresses Filtering and Forwarding 15,000 pps Buffer 256 frames Delay 1 frame LAN Standard Conforms to IEEE 802.3/Ethernet Data Rate 10 Mbps (20 Mbps 10BaseT FDX) Connector[...]

  • Page 51

    Appendix A. Ethernet Interface ASM-20 Installation and Operation Manual A-4 Installation and Operation 6/4/99 13:17 1 2 3 4 Figure A - 6 Ethernet Bridge Layout (BNC option) LAN Installation For 10BaseT installation, either a straight cable or a cross-cable may be required. Use a cross-cable when connecting to a port that does not implement the cros[...]

  • Page 52

    ASM-20 Installation and Operation Manual Appendix A. Ethernet Interface 6/4/99 13:17 Installation and Operation A-5 Table A - 3 IR-ETH Bridge LED Indicators LED Name Description Location Color LINK ON indicates good link integrity (available only in the 10BaseT version) Panel Green COLL ON indicates collision on the attached Ethernet segment Panel [...]

  • Page 53

    Appendix A. Ethernet Interface ASM-20 Installation and Operation Manual A-6 Installation and Operation 6/4/99 13:17[...]

  • Page 54

    6/4/99 13:17 General Description B- 1 Appendix B IR-G.703 Codirectional Interface (64 kbps) B. 1 Introduction This appendix: • Provides a general description of the IR-G.703 codirectional interface (64 kbps) • Describes the EXT mode for the IR-G.703 codirectional interface (64 kbps) • Describes the INT/RCV mode for the IR-G.703 codirectional [...]

  • Page 55

    Appendix B. IR-G.703 Codirectional Interface (64 kbps) ASM-20 Installation and Operation Manual B- 2 EXT Mode 6/4/99 13:17 Figure B - 1 IR-G.703 Connector Options Note In Figure B-1, RCV refers to the input signals to the IR module; XMT refers to the output signals from the module. The IR-G.703 interface module is shown in Figure B- 2 . It has two [...]

  • Page 56

    ASM-20 Installation and Operation Manual Appendix B. IR-G.703 Codirectional Interface (64 kbps) 6/4/99 13:17 INT/RCV Mode B- 3 This mode corresponds to the modem clock working in the EXT mode. T i m i ng Sour c e T X D a ta TX TX RX RX RX Dat a G. 70 3 Codi r ec t i ona l 64 kbps net w o r k FI FO EX T Cl o c k M o d e R CV Cl o c k M o d e Cl ock [...]

  • Page 57

    Appendix B. IR-G.703 Codirectional Interface (64 kbps) ASM-20 Installation and Operation Manual B- 4 INT/RCV Mode 6/4/99 13:17[...]

  • Page 58

    6/4/99 13:18 General Description C - 1 Appendix C IR-X.21B Interface Module C . 1 General This appendix: • Provides a general description of the IR-X.21B interface module • Describes the IR-X.21B connectors and pin assignments • Describes the IR-X.21B interface module • Describes the EXT mode for the IR-X.21B • Describes the INT/RCV mode [...]

  • Page 59

    Appendix C. IR- X.21B Interface Module ASM-20 Installation and Operation Manual C- 2 IR-X.21B Interface Module 6/4/99 13:18 C . 3 IR-X.21B Connectors Figure C- 2 shows the rear panel of a standalone ASM-20 with the IR-X.21B interface module. DTE X21 Line Con nect or Figure C- 2 ASM-20 Rear Panel with X.21 Connector The ASM-20 modem rack version req[...]

  • Page 60

    ASM-20 Installation and Operation Manual Appendix C. IR- X.21B Interface Module 6/4/99 13:18 EXT Mode C -3 C . 4 IR-X.21B Interface Module The IR-X.21B interface module is shown in Figure C- 3 . It has two operation modes which are selectable on the PCB board. The selection is made by means of the JP2 jumper located within the module as shown in th[...]

  • Page 61

    Appendix C. IR- X.21B Interface Module ASM-20 Installation and Operation Manual C -4 INT/RCV Mode 6/4/99 13:18 IR-X.21 FIFO Buffer Transmit Data from DTE External Timing from DTE Receive Data to DTE (Jumpers 2,9) (Jumpers 6,13) (Jumpers 4,11) DB Connector RD RC TC TD MODEM (EXT) Figure C- 4 EXT Mode Timing Block C . 6 INT/RCV Mode This mode is used[...]

  • Page 62

    13/4/99 16:40 General D- 1 Appendix D DTE Interface Connectors D.1 . General Table D-1 provides detailed information about each DTE interface connector. Table D - 1 Interface Signal List (Female Connectors) Pins and Standard Signal Names RS-232 V.35 EIA-530 X.21 Signal Function DB-25 Stand- alone and Frame DB-25 Frame 34-pin Standalone Pin Circuit [...]

  • Page 63

    Appendix D. DTE Interface Connectors ASM-20 Installation & Operation Manual D- 2 General 13/4/99 16:40 Table D- 1 Interface Signal List (Female Connectors) Pins and Standard Signal Names (Cont.) RS-232 V.35 EIA-530 X.21 Signal Function DB-25 Stand- alone and Frame DB-25 Frame 34-pin Standalone Pin Circuit DB-25 Standalone and Frame Pin Circuit [...]

  • Page 64

    ASM-20 Installation & Operation Manual Appendix D. DTE Interface Connectors 13/4/99 16:40 General D- 3 Table D- 1 Interface Signal List (Female Connectors) Pins and Standard Signal Names (Cont.) RS-232 V.35 EIA-530 X.21 Signal Function DB-25 Stand- alone and Frame DB-25 Frame 34-pin Standalone Pin Circuit DB-25 Standalone and Frame Pin Circuit [...]

  • Page 65

    Appendix D. DTE Interface Connectors ASM-20 Installation & Operation Manual D- 4 General 13/4/99 16:40 Table D- 1 Interface Signal List (Female Connectors) Pins and Standard Signal Names (Cont.) RS-232 V.35 EIA-530 X.21 Signal Function DB-25 Stand- alone and Frame DB-25 Frame 34-pin Standalone Pin Circuit DB-25 Standalone and Frame Pin Circuit [...]

  • Page 66

    6/4/99 13:20 General E -1 Appendix E Connection to RS-422 E. 1 General Table E-1 provides detailed information for connecting an ASM-20 (EIA 530) to a RS-422 (V.36) DTE. Table E - 1 Interface List for Connecting ASM-20 (RS- 530) to RS -422 (V.36) DTE Signal Function RS-449 (RS-422/423) EIA 530 37 Pins DB-25 Female Standalone and Frame Pin Circuit P[...]

  • Page 67

    Appendix E. Connection to RS-422 ASM-20 Installation and Operation Manual E -2 General 6/4/99 13:20 Table E - 1 Interface List for Connecting ASM-20 (EIA 530) to RS -422 (V.36) DTE (Cont.) Signal Function RS-449 (RS-422/423) EIA 530 37 Pins DB-25 Female Standalone and Frame Pin Circuit Pin Circuit Receive Clock 8 RT (A) 26 RT (B) 17 DD (A) 9 DD (B)[...]

  • Page 68

    11/4/99 12:26 Installation of the Unit Case into a 19" Rack F- 1 Appendix F Unit Case Assembly F. 1 General This appendix: • Describes the unit case • Describes how to install the unit case into a 19” rack. F. 2 Unit Case The unit case design facilitates quick access to the interior strappings as well as easy installation into a 19"[...]

  • Page 69

    Appendix F. Unit Case Assembly ASM-20 Installation and Operation Manual F- 2 Installation of the Unit Case into a 19" Rack 11/4/99 12:26 Shor t Br ack et Faste n i ng Scr ews Lo ng Br ac ke t Figure F - 1 Installation of a Single Unit Installation of Two Units Rack adapter components for installing two units include two long side rails (one fo[...]

  • Page 70

    ASM-20 Installation and Operation Manual Appendix F. Unit Case Assembly 11/4/99 12:26 Installation of the Unit Case into a 19" Rack F-3 Shor t Br ack et Le f t- Hand Uni t Ri ght - Hand Uni t Rai l Shor t Br ack et Rai l Figure F -2 Rack Adapter Components for Installation of Two Units To install two units: 1. Fasten one long side rail to each[...]

  • Page 71

    Appendix F. Unit Case Assembly ASM-20 Installation and Operation Manual F- 4 Installation of the Unit Case into a 19" Rack 11/4/99 12:26 4. Secure the supplied plastic caps to the ends of the rails, to prevent the units moving and to protect the rail ends. 5. Place the assembled units in the rack and fasten the brackets to the side rails of th[...]