STRAT-3 error log entries and recommended actions

Last Updated : Dec 10, 2020 |
Table 1: 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.

      Table 2: 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.