Specifications

1-36
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 1 Alarm Troubleshooting
Alarm Procedures
indicates that the ONS 15454 SDH has gone into holdover and is using the ONS 15454 SDH internal
reference clock, which is a Stratum 3-level timing device. The alarm clears when primary or secondary
timing is reestablished.
Procedure: Clear the HLDOVERSYNC Alarm
Step 1 Check for additional alarms that relate to timing.
Step 2 Reestablish a primary and secondary timing source according to local site practice.
1.5.40 HP-TIM
• Minor, Service-affecting
The TIM high-order trace identifier mismatch failure alarm applies to optical and electrical cards. It is
raised when there is a mismatch between the transmitted and received J1 identifier byte in the SDH
payload overhead. The error can originate in the transmit end or the receive end.
Procedure: Clear the HP-TIM Alarm
Step 1 To determine the validity of the J1 byte, examine signal as near the reporting card as possible. Use an
optical test set capable of viewing SDH overhead.
Step 2 Use an optical test set to examine the J1 byte of the signal from the output card. Examine the signal as
close as possible to the card.
Step 3 If the output card signal is valid, follow the procedure in the “SYNCPRI” section on page 1-52.
1.5.41 HP-UNEQ
• Critical, Service-affecting
The SLMF unequipped high-order path unequipped alarm applies to the C2 label byte on optical and
electrical cards. It is raised when there is no label byte received in the SDH payload overhead.
Procedure: Clear the HP-UNEQ Alarm
Step 1 To determine the validity of the C2 byte, examine signal as near the reporting card as possible. Use an
optical test set capable of viewing SDH overhead.
Step 2 Use an optical test set to examine the C2 byte of the signal from the output card. Examine the signal as
close as possible to the card.
Step 3 If the output card signal is valid, follow the procedure in the “SYNCPRI” section on page 1-52.