XDM-300 Installation and
Maintenance Manual
Maintenance
417006-2311-0H3-A00
ECI Telecom Ltd. Proprietary
4-17
Troubleshooting the Timing Subsystem
Table
4-9: Troubleshooting procedures for timing subsystem
No. Symptoms
Probable
cause
Corrective
actions
Technical failure
Force switching of traffic to the other MXC300, and then
replace the MXC300 card with the defective TMU.
Missing T3/BITS
IN external
reference signal
1.
Check the equipment providing the external reference
signal and make sure it operates normally.
2.
Check the cable connected to the corresponding
ECU300/ECU300-F connector. Make sure both its
ends are properly connected to the mating connector.
3.
Check the cable wiring. Replace the cable if in doubt.
4.
Replace the corresponding ECU300/ECU300-F.
Missing T4/BITS
OUT external
reference signal
1.
Check the cable connected to the corresponding
ECU300/ECU300-F connector. Make sure both its
ends are properly connected to the mating connector.
2.
Check the cable wiring. Replace the cable if in doubt.
3.
Replace the corresponding ECU300/ECU300-F.
4.
Force switching of traffic to the other MXC300, and
then replace the MXC300 with the defective TMU.
1 Switching
to
standby TMU
Loss of reference
clock source
provided by a
tributary
Troubleshoot the corresponding module and replace it if
found faulty.
Summary of Contents for XDM-300
Page 1: ...XDM 300 Installation and Maintenance Manual Version 7 417006 2311 0H3 A00...
Page 2: ......
Page 8: ......