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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
interface. See Table 2-2 for more information. The TEST LED should
turn on. ASM-20 transmit output is now connected to its own receiver
(see Figure 4-3).
2. Check that the DTE is operating properly and can be used for a test. If a
fault is indicated, call a technician or replace the unit.
3. Execute the test using one of the methods described below:
•
Use the DTE and check the echoed data stream
•
Use an external Bit Error Rate Tester (BERT) unit
•
Use the internal Bit Error Rate Tester (BERT). Press the PATT push
button. The ERR LED will light up briefly to indicate that the LED is
functioning. If any bit error is encountered, the LED will blink or
remain ON.
4. Perform Step 3 at both ends. If the BERT test equipment does not
indicate a fault, but the data terminal does, follow the manufacturer’s
test procedures for the data terminal and check that the cable
connecting the terminal and ASM-20 is working. After completion of the
test (or when the fault has been corrected), restore the ANA push
button to the OFF position by pressing the ANA push button again.
Proceed to Communication Link Tests below.
4.7 Communication Link Tests
Remote Digital
Loopback
This test determines the performance of the local and remote ASM-20, and
the lines connecting them.
To check the performance of the local and remote ASM-20:
1. Press the REM (Remote Loopback) push button, providing a loopback at
the remote ASM-20 (see Figure 4-4). (This test can also be activated via
the pin on the DTE interface.) The TEST LED should light up at both the
local and remote units.
2. Perform the BERT test using one of the methods described below:
•
Use the DTE and check the echoed data stream
•
Use an external Bit Error Rate Tester (BERT) unit
•
Use the internal Bit Error Rate Tester (BERT). Press the PATT push
button. The ERR LED will light up briefly to indicate that the LED is
functioning. If any bit error is encountered the LED will blink or
remain ON.
- Warranty 3
- Safety Warnings 4
- Telecommunication Safety 4
- Regulatory Information 5
- Declaration of Conformity 6
- Quick-Start Guide 7
- Foreword 8
- Conventions 9
- Contents 10
- List of Figures 12
- List of Tables 13
- Chapter 1 14
- Introduction 14
- Features 15
- 1.2 Physical Description 16
- 1.3 Functional Description 17
- Chapter 1. Introduction 19
- Digital Interface 20
- Diagnostics 20
- Timing Elements 20
- Indicators 21
- Electrical 21
- Physical 21
- Environment 21
- Table 1-1 Approximate Range 22
- Chapter 2 24
- Installation and Setup 24
- 2.3 Package Contents 25
- 2.4 Mechanical Installation 25
- 2.5 Electrical Installation 25
- Strap Selection 26
- Setting Internal 26
- Jumpers and 26
- Switches 26
- Only for standalone option 27
- ASM-20 28
- Power Connection 30
- Chapter 3 32
- Operation 32
- Figure 4-5 33
- Figure 4-3 33
- Figure 4-4 33
- 3.3 Operating Instructions 34
- Chapter 3. Operation 35
- Chapter 4 36
- Troubleshooting 36
- 4.3 Loop Tests Procedure 37
- 4.5 Modem Self Test 39
- Remote Digital 40
- Loopback 40
- Local Digital 41
- Chapter 5 42
- Card Cage Version 42
- 5.3 ASM-20/R Card Version 43
- 5.4 Power Supply 44
- Power Supply 45
- 5.5 Installation 46
- Chapter 5. Card Cage Version 47
- Appendix A 48
- Ethernet Interface 48
- Line Connector 49
- LAN Installation 51
- Switch Settings 51
- LED Indicators 51
- Appendix B 54
- IR-G.703 Codirectional 54
- Interface (64 kbps) 54
- B.3 EXT Mode 55
- B.4 INT/RCV Mode 56
- B-4 INT/RCV Mode 6/4/99 13:17 57
- Appendix C 58
- IR-X.21B Interface Module 58
- C.3 IR-X.21B Connectors 59
- C.5 EXT Mode 60
- C.6 INT/RCV Mode 61
- Appendix D 62
- DTE Interface Connectors 62
- Appendix E 66
- Connection to RS-422 66
- E-2 General 6/4/99 13:20 67
- Appendix F 68
- Unit Case Assembly 68
- Fastening 69
- Long Bracket 69
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