Symmetricom SDU-2000, User Manual, Page: 119 / 470

12713020-002-2 Revision D – April 2004 SSU-2000 User’s Guide 119
Maintenance and Troubleshooting
Troubleshooting
Fault LED on oO Loose module Reseat module.
Loss of signal to output module Reseat or replace input module (or
clock module if necessary).
Line fault Remove the Tx Cable
Improper redundancy
configuration Adjust accordingly.
Main shelf:
left slot = even
right slot = odd
Expansion shelf:
left slot = odd
right slot = even
Fault LED on
Output module is
flashing amber Fault on distribution cabling Verify cabling is connected properly.
Replace cabling.
No LED lit on
modules Power supply failure Check connection to power supply.
Blown fuse Replace module.
No alarms being
reported when
there is an alarmed
condition Compromised firmware Press RST on Comms module front
panel.
Faulty Comms module Replace Comms module.
Alarmed module is faulty Replace module.
Loss of power from
Expansion shelf No power to unit Check to ensure that UPS (if applicable)
is operating correctly.
Both A and B fuses on Expansion
shelf are blown Remove fuses and replace.
Loss of ground Re-attach ground wires.
Loose power cabling to
Expansion shelf Check that power cables to unit are
securely fastened.
Expansion shelf is faulty Call Symmetricom Global Services.
Loss of signal from
Expansion shelf D clock not connected; loose
SDU cable to the expansion shelf Check SDU cable and connect D clock.
Any amber source
LED on the Output
module Loss of clock signal Ensure clock modules are inserted
properly.
Clock modules are in warmup
mode No action necessary.
Table 5-3. SSU-2000 Troubleshooting Procedures (Continued)
Symptom Probable Cause
Troubleshooting
Procedure/Corrective Action