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TDM-BUS (TDM Bus)
Issue 1 June 2005 2239
Procedure 1: Isolating TDM-Bus Faults
This procedure is an attempt to isolate the TDM-bus fault to circuit packs that are essential to
the system’s operation. For each of the following circuit packs in the port network where the
TDM-bus fault appears, perform Procedure 1.
1. Display the Alarm Log for the circuit pack using display alarms.
2. If there are alarms for the circuit pack, refer to that section and try to resolve the alarms.
3. Whether or not every alarm can be cleared, test the TDM bus again using test tdm P.
4. If some TDM-bus tests fail, implement Procedure 1 for the next circuit pack.
5. If every TDM-bus test passes, the problem has been fixed.
6. If every circuit pack in the list has been investigated, go to Procedure 2.
Procedure 2: Removing and Reinserting Port
Circuit Packs
Procedure 2 removes and reinserts port circuit packs (those in the carrier’s purple slots) one or
more at a time. Use this procedure for each port circuit pack in the port network until the
problem is resolved or until every circuit pack in the port network have been tried. To execute
diagnostic procedures on the Expansion Interface and Tone-Clock circuit packs, see Procedure
3: Removing and Reinserting PN Control Circuit Packs on page 2241. Although these circuit
packs reside in purple slots, procedure 2 does not apply. This procedure does apply to the Tone
Detector circuit pack.
If the TDM bus problem is present when the circuit pack is inserted, but is resolved when the
circuit pack is removed, either the circuit pack or the backplane pins in that slot are causing the
problem. If the backplane pins are intact, replace the circuit pack. If some of the tests fail
regardless of whether the circuit pack is inserted or removed, and the backplane pins are intact,
the circuit pack is not the cause of the problem. In a multiple failure situation, the circuit pack
could be one cause of the TDM bus problem. However, other simultaneous failures might also
be responsible for TDM-bus faults.
Circuit Pack Error Log Names
Tone-Clock TONE-BD, TONE-PT, and TDM-CLK
MSS/Network Control SW-CTL and H-ADAPTER
Tone Detector DETR-BD, GPTD-PT, and DTMR-PT
Expansion Interface EXP-INTF
Packet Interface PKT-INT