Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Section 9. TROUBLESHOOTING
9.1 INTRODUCTION
This section contains a general approach to troubleshooting the IMUX 2000 system, and CM4
Common Module diagnostics. The general troubleshooting section includes an introduction to the use
of IMUX 2000 loopbacks, E1 test equipment, and channel test equipment for in-service or out-of-
service testing. This information is helpful when troubleshooting an existing system, or when trying to
isolate a problem during the check-out phase of a new system installation. For general troubleshooting,
refer to paragraph 9.2. The CM4 Common Module diagnostic section contains specific information on
troubleshooting certain E1 related problems. For CM4 Common Module diagnostics, refer to
paragraph 9.3. No procedure, however, can cover all possible situations. If you have reached what
appears to be a dead end, or if the information in this section does not seem to apply to your case,
please contact RFL for assistance in troubleshooting your IMUX 2000 system.
9.2 GENERAL TROUBLESHOOTING
9.2.1 TROUBLE TYPES
IMUX 2000 system troubles generally fall into three categories:
1. Setup Errors
2. E1 Network Problems
3. IMUX 2000 Equipment Problems
Details of these three major categories appear in Figure 9-1.
SET-UP ERRORS
E1 NETWORK PROBLEMS
IMUX 2000 EQUIPMENT PROBLEMS
E1 TRANSMIT TIMING MODE
E1 FRAME FORMAT
E1 LINE CODE
CHANNEL MODULE SETUP
NO SIGNAL OR LOW LEVEL
ALARM INDICATION SIGNAL (AIS
BIT ERRORS
EXCESSIVE JITTER OR WANDER
SENSITIVITY TO 1S DENSITY
TIMING
POWER SUPPLY
CM4 COMMON MODULE
CHANNEL MODULE
WIRING OR CONNECTOR
IMUX 2000 SYSTEM OR CHANNEL TROUBLE REPORTED
Figure 9-1. Basic troubleshooting categories
IMUX 2000E1 RFL Electro
nics Inc.
January 23, 2004 9-1 (973) 334-3100
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