Maintenance and Troubleshooting
Troubleshooting Charts
126
TSG-3800 User’s Guide
12778474-002-2 Revision F – March 2004
Troubleshooting the T1 Input Module
The T1 Input module (23478303-002-0) has four LED indicators.
Table 4-7
shows
the normal and fault indications and provides troubleshooting information.
Table 4-7. Troubleshooting the T1 Input Module
Indicator
Indicator Status
Cause
Corrective Action
Normal
Fault
Power
Green
Off
Power failed on either A
or B inputs
DC/DC converter on
module failed
1.
Check Power indicator on other
modules. If they are lit, then
replace this module.
2.
If power is not available to shelf,
check rear panel fuses and
power source.
3.
Replace fuses as necessary.
REF
Green
Status indicator only.
The port identified is
the BITS Reference
The TSG requires only one input
port as a reference. Only one REF
indicator should be lit on all installed
Input modules.
Mod Flt
Off
Red
Input module hardware
fault
Replace defective module with a
known good spare with the same
configured options.
Caution:
To allow the CPU module
to auto-configure the Input module,
do not disable the Input module
before removing it.
Port Fault
Off
Red
1.
Faulted input
reference signal.
2.
Possible faulty
Clock module
Input reference
switches to alternate
Input module, or Clock
module enters
Holdover mode.
1.
Use test equipment to test the
integrity of the input signal.
2.
Use the Alarm command to
determine the alarm type.
3.
Troubleshoot the alarm
according to the alarm type.
This is not an Input module
hardware fault. To avoid data loss,
do not
re-boot or restart the CPU
module.
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