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ASM-20 Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics
Local Test - Analog Loopback 4-3
4.3 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 DCD LEDs should light up. If the DCD LED does not light up, check
that the CARRIER jumper is ON or that the RTS signal is ON (high).
2. Press the PATT push button. Verify that:
DCD LED is still lit up
TEST LED is still lit up
ERR LED lights up for a short period.
The ERR LED should then turn off. If it lights up or blinks, then ASM-20 is
faulty and should be replaced. If the test executes correctly, restore all the
push buttons and jumpers to the required position.
4.4 Local Test - Analog Loopback
This test checks the performance of the local modem, the local data terminal and
the cables connecting them. Perform it separately at the local and remote sites.
ANA
Pressed
LINE
ASM-20
XMTR
RCVR
DATA
TERMINAL
CLK
CLK
DATA
Figure 4-3. Local ASM-20 in Analog Loopback
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).
- Limited Warranty 4
- General Safety Instructions 5
- Handling Energized Products 6
- FCC-15 User Information 8
- Declaration of Conformity 10
- Quick Start Guide 11
- Contents 13
- Table of Contents 14
- Chapter 1 15
- Introduction 15
- Features 16
- Options 16
- 1.2 Physical Description 17
- 1.3 Functional Description 18
- G.703 DTE Interface 20
- 1.4 Technical Specifications 21
- (Complies with the 22
- V.54 Standard) 22
- Table 0-1 Approximate Range 23
- 2.1 Introduction 25
- 2.3 Package Contents 25
- 2.4 Equipment Needed 26
- Warning 27
- 2.6 Connecting the Cables 30
- 3.1 Power On 31
- 3.2 Controls and Indicators 31
- Figure 4-5) 33
- Figure 4-3 33
- 3.3 Operation 34
- 3.4 Power Off 34
- 4.1 Loop Test Procedure 35
- 4.3 Modem Self Test 37
- Remote Digital Loopback 38
- Local Digital Loopback 39
- 4.7 Technical Support 41
- 4-8 Technical Support 42
- 5.1 ASM-MN-214 Card Cage 43
- 5-2 ASM-MN-214 Card Cage 44
- 5.2 ASM-20/R Card Version 45
- 5.3 Power Supply 46
- Installation 5-5 47
- 5.4 Installation 48
- MODEM MODEM 49
- Line Connector 50
- LAN Installation 52
- Switch Settings 52
- LED Indicators 52
- B.1 Introduction 55
- B.2 General Description 55
- B.3 EXT Mode 56
- B.4 INT/RCV Mode 57
- B-4 INT/RCV Mode 58
- C.1 Description 59
- C.2 IR-X.21B Connectors 59
- Pin Assignment 60
- C.4 EXT Mode 61
- C.5 INT/RCV Mode 62
- Appendix D 63
- DTE Interface Connectors 63
- D-4 66
- Appendix E 67
- Connection to RS-422 67
- F.1 Unit Case 69
- Fastening 70
- Long Bracket 70
- Customer Response Form 73
- Error Report 75
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