Symmetricom SSU-2000 User Manual page 135

Table 5-3. SSU-2000 Troubleshooting Procedures (Continued)
Symptom
Fault LED on
Output module is lit
Fault LED on
Output module is
flashing amber
No LED lit on
modules
No alarms being
reported when
there is an alarmed
condition
Loss of power from
Expansion shelf
Loss of signal from
Expansion shelf
Any amber source
LED on the Output
module
12713020-002-2 Revision F.01 – January 2007
Probable Cause
Loose module
Loss of signal to output module
Line fault
Improper redundancy
configuration
Fault on distribution cabling
Power supply failure
Blown fuse
Compromised firmware
Faulty Comms module
Alarmed module is faulty
No power to unit
Both A and B fuses on Expansion
shelf are blown
Loss of ground
Loose power cabling to
Expansion shelf
Expansion shelf is faulty
D clock not connected; loose
SDU cable to the expansion shelf
Loss of clock signal
Clock modules are in warmup
mode
Chapter 5 Maintenance and Troubleshooting
Troubleshooting
Procedure/Corrective Action
Reseat module.
Reseat or replace input module (or
clock module if necessary).
Remove the Tx Cable
Adjust accordingly.
Main shelf:
left slot = even
right slot = odd
Expansion shelf:
left slot = odd
right slot = even
Verify cabling is connected properly.
Replace cabling.
Check connection to power supply.
Replace module.
Press RST on Comms module front
panel.
Replace Comms module.
Replace module.
Check to ensure that UPS (if applicable)
is operating correctly.
Remove fuses and replace.
Re-attach ground wires.
Check that power cables to unit are
securely fastened.
Call Symmetricom Global Services.
Check SDU cable and connect D clock.
Ensure clock modules are inserted
properly.
No action necessary.
SSU-2000 User's Guide 135
Troubleshooting