Troubleshooting The T1 Input Module; Clock Module - Symmetricom TSG-3800 Series User Manual

Maintenance and Troubleshooting
Troubleshooting Charts

Troubleshooting the T1 Input Module

The T1 Input module (23478303-002-0) has four LED indicators.
the normal and fault indications and provides troubleshooting information.
Table 4-7. Troubleshooting the T1 Input Module
Indicator Status
Indicator
Normal
Power Green
REF Green
Mod Flt Off
Port Fault Off
126 TSG-3800 User's Guide
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Cause
Fault
Off Power failed on either A
or B inputs
DC/DC converter on
module failed
Status indicator only.
The port identified is
the BITS Reference
Red Input module hardware
fault
Red 1. Faulted input
reference signal.
2. Possible faulty

Clock module

Input reference
switches to alternate
Input module, or Clock
module enters
Holdover mode.
Table 4-7
Corrective Action
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.
The TSG requires only one input
port as a reference. Only one REF
indicator should be lit on all installed
Input modules.
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.
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.
12778474-002-2 Revision F – March 2004
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