STRAT-3 error log entries and recommended actions

Last Updated : Dec 10, 2020 |
Prolog information
Metadata
Keywords:
STRAT-3 error log entries
Error type
Aux data
Associated test
Alarm level
On or Off board
Command to resolve the error
0
0
Any
Any
Any
test synchronization r 4
1
Any
Stratum-3 Clock Alarm Query (#649)
MIN
OFF
test synchronization r 4
18
0
disable sync
WRN
OFF
enable sync
257
Any
Stratum-3 Clock Alarm Query (#649)
MIN
OFF
test synchronization r 4
513
Any
Stratum-3 Clock Alarm Query (#649
MIN
ON
test synchronization r 4
769
Any
Stratum-3 Clock Alarm Query (#649)
MIN
ON
test synchronization r 4
1025
Any
Stratum-3 Clock Alarm Query (#649)
MIN MAJ ()
ON
test synchronization r 4
1281
Any
Stratum-3 Clock Alarm Query (#649)
MIN MAJ ()
ON
test synchronization r 4
1537
MIN MAJ ()
ON
1793
MIN MAJ ()
ON
Note:
  1. Error type 0: Run the short test sequence first. If every test passes, run the long test sequence. Refer to each test’s description, and follow its procedures.
  2. Error type 1: this Error type corresponds to FAIL code 1 of the Stratum-3 Clock Alarm Query (#649): Either reference A failed or the CI card A failed.
  3. Error type 18: Synchronization Maintenance was disabled with disable synchronization.
    1. Enter enable synchronization to enable Synchronization Maintenance reference switching and to resolve this alarm.
  4. Error type 257: this Error type corresponds to FAIL code 2 of the Stratum-3 Clock Alarm Query (#649): one power supply failed.
  5. Error type 513: this Error type corresponds to FAIL code 4 of the Stratum-3 Clock Alarm Query (#649): one clock unit failed.
  6. Error type 769: this Error type corresponds to FAIL code 8 of the Stratum-3 Clock Alarm Query (#649): either reference B failed or the CI card B failed.
  7. Error type 1025: this Error type corresponds to FAIL code 16 of the Stratum-3 Clock Alarm Query (#649): every power supplied failed.
    A Minor alarm results if the Stratum-3 clock can still provide timing to the switch; otherwise, a Major alarm will be raised because the Stratum-3 clock is not providing timing and the switch is referencing the local oscillator on the TN780 Tone-Clock circuit pack. If only the active TN780 Tone-Clock circuit pack is faulty, the standby TN780 Tone-Clock circuit pack becomes active and remains synchronized to the Stratum-3 clock. When the system switches to the standby Tone-Clock circuit pack, the alarm is resolved, and a TDM-CLK alarm is raised to indicate a possible problem on the TN780 Tone-Clock circuit pack.
    If the alarm is MINOR:
    1. Look for a red LED on either or both TOC cards.
    2. If there is a red LED, replace the card. If there is no red LED, use the Stratum-3 Wiring Guide, and check that the wiring installation is correct.
    3. After replacing the card or correctly rewiring the installation, clear the alarm by entering disable synchronization, followed by enable synchronization. The latter procedure causes synchronization software to switch back to using the Stratum-3 clock again.
    4. Wait 2 minutes and run status synchronization.
    5. If Maintenance Name on the status screen shows STRAT-3 the problem is resolved.
      Caution:
      The disable synchronization command followed by enable synchronization may cause slip alarms. The circuit packs that can experience slips and the associated error log entry for slips are listed in Table 241: Timing Slip Error types.
      Timing slip Error types
      Circuit pack name
      Error log name
      Error log number of slips
      DS1 Interface
      DS1-BD
      3073 to 3160
      Expansion Interface
      EXP-INTF
      2305
      Switch Node Interface
      SNI-BD
      1537
      Tone-Clock
      TDM-CLK
      1025
      UDS1 Interface
      UDS1-BD
      3073 to 3160
If the alarm is MAJOR:
  • Check connections between the Stratum-3 clock and the switch.
  • If there are no loose connections, use the Stratum-3 Wiring Guide and check that the wiring installation is correct.
  • After reconnecting the loose connection or correctly rewiring it, clear the alarm by entering disable synchronization, followed by enable synchronization.
  • Wait 1 minute, then run status synchronization.
  • If Maintenance Name on the status screen shows STRAT-3 then the problem is resolved.
If the Standby Tone-Clock circuit pack became active:
  • Check the connection between the Stratum-3 clock and the TN780 Tone-Clock circuit pack from which the system has just switched.
  • If there are no loose connections, then, replace the circuit pack containing the TN780 Tone-Clock circuit pack.
  • Before switching back to the new TN780 Tone-Clock circuit pack, use test tone-clock location long to check that the Tone-Clock is receiving a signal from the Stratum-3 clock.
  • If every test passes, switch to the new Tone-Clock circuit pack using set tone-clock location override.
  • If Test #651 fails, then the original TN780 Tone-Clock circuit pack should be reinserted, and the cable between the Stratum-3 clock and the TN780 Tone-Clock circuit pack should be replaced.
  • If Test #651 continues to fail, then escalate the problem.
  • If slip alarms exist after following the repair procedures for any of the previous cases, clear the slip alarms by running test board clear. See Table 241: Timing Slip Error types for a list of circuit packs and associated slip error log entries.
  • This error indicates that the Tone-Clock circuit pack in the master port network is not a TN780. If duplicate Tone-Clock circuit packs exist in the master port network, this error may mean that one or both Tone-Clock circuit packs are not TN780s. Verify that the Tone-Clocks in the master port network are TN780s.
  1. Error type 1281: this Error type corresponds to FAIL code 32 of the Stratum-3 Clock Alarm Query (#649): every clock unit failed.
  2. Error type 1537: An OFF-BOARD alarm on the Stratum-3 clock, indicates a DS1 facility problem; an ON-BOARD alarm indicates a fault in either the Stratum-3 clock or the connection between the Stratum-3 clock and the switch. If the Stratum-3 clock cannot be referenced and the local oscillator on the TN780 Tone-Clock circuit pack must serve as the reference, a Major alarm is raised. Otherwise, a Minor alarm is raised.
  3. Error type 1793: this error can be caused by one of the following conditions:
    • One or both Timing Output Cards (TOCs) has failed.
    • The connection between the Stratum-3 clock and the TN780 Tone-Clock circuit pack is faulty.
    • The TN780 Tone-Clock circuit pack is defective.