RAD Data comm ASM-20

ASM-20 Installation and Operation Manual Chapter 4. Troubleshooting and Diagnostics

11/4/99 12:34 Bit Error Rate Tester (BERT) 4-3

PATT

Pressed

Pattern

Generator

Pattern

Teste r

Error

XMT

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. Figure 4-2 illustrates the two options for testing

a complete link:

• Press the PATT push button of the local modem and check the ERR/RPF

LED. At the remote side check an external BERT.

• Press the PATT push button of the local and remote modems and check

their ERR LEDs.

LOCAL ASM-20

PATT

Pressed PATT

Pressed

Pattern

Generator

Pattern

Generator

Error

XMT

RCV

Pattern

Teste r

Pattern

Teste r

REMOTE ASM-20

511

External

BERT

Figure 4-2 Two BERTs Operating End-to-End

Contents

Main ASM-20 Synchronous/Asynchronous Short Range Modem Installation and Operation Manual Notice Page Warranty Limitation of Warranty Exclusive Remedies Safety Warnings Telecommunication Safety Regulatory Information Declaration of Conformity Quick-Start Guide 1. Installing and Operating ASM-20 Preface Foreword Conventions Note Contents Page List of Figures Page Chapter 1 Introduction 1.1 Overview Applications Features 1.2 Physical Description Front Panel LEDs Jumpers Rear Panel 1.3 Functional Description Encoder Page 1.4 Technical Specifications Digital Interface Diagnostics Timing Elements Page Table 1-1 Approximate Range Page Chapter 2 Installation and Setup 2.1 Introduction 2.2 Site Preparation and Prerequisites 2.3 Package Contents 2.4 Mechanical Installation 2.5 Electrical Installation Strap Selection Setting Internal Jumpers and Switches Chapter 2. Installation and Setup ASM-20 Installation and Operation Manual * BAUD RATE Figure 2-3 PCB Layout Diagram Warning Table 2-1 ASM-20 Strap Selection Settings Table 2-1 ASM-20 Strap Selection Settings (Cont.) Table 2-2 Async Character Length Setting Power Connection Page Chapter 3 Operation 3.1 General 3.2 Controls and Indicators ASM-20 Figure 3-2 ASM-20R Front Panel Table 3-1 Control and Indicator Functions Figure 4-3 3.3 Operating Instructions Power On Procedure Page Chapter 4 Troubleshooting and Diagnostics 4.1 General 4.2 Frequently Asked Questions 4.3 Loop Tests Procedure 4.4 Bit Error Rate Tester (BERT) 4.5 Modem Self Test 4.6 Local Test - Analog Loopback 4.7 Communication Link Tests Remote Digital Loopback Local Digital Loopback Chapter 5 Card Cage Version 5.1 General 5.2 ASM-MN-214 Card Cage Page 5.4 Power Supply AC Supply (100, 115 or 230 VAC) DC Supply (-48 VDC) Page 5.5 Installation Page Appendix A Ethernet Interface A.1 General A.2 Description A.3 IR-ETH Connector Options A.4 Ethernet Bridge Specifications General LAN WAN A.5 Installation and Operation LAN Installation Switch Settings LED Indicators Table A-3 IR-ETH Bridge LED Indicators Page Appendix B IR-G.703 Codirectional Interface (64 kbps) B.1 Introduction B.2 General Description B.3 EXT Mode 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. Modem A Modem B B.4 INT/RCV Mode Modem A Modem B Page Appendix C IR-X.21B Interface Module C.3 IR-X.21B Connectors Pin Assignment C.4 IR-X.21B Interface Module C.5 EXT Mode C.6 INT/RCV Mode Appendix D DTE Interface Connectors D.1. General Page Page Page Appendix E Connection to RS-422 E.1 General Table E-1 Interface List for Connecting ASM-20 (EIA 530) to RS-422 (V.36) DTE (Cont.) Appendix F Unit Case Assembly F.1 General F.2 Unit Case F.3 Installation of the Unit Case into a 19" Rack