Packet and serial bus maintenance
Isolating and repairing packet-bus faults
Maintenance Procedures
241
December 2003
Procedure 2: removing and reinserting port
circuit packs
Procedure 2 removes and reinserts port circuit packs (purple slots) and the EI circuit pack one or several
at a time. Use Procedure 2 for each port circuit pack in the PN until every port circuit pack has been tried
or the problem is resolved.
NOTE:
An EI circuit pack should be the last one checked since removing it disconnects the PN.
To check an active EI in a critical-reliability system (duplicated PNC), use reset pnc
interchange to make it the standby. Always check the standby’s status before executing
an interchange.
NOTE:
A Tone-Clock circuit pack should be the next-to-last one checked. (The TN771D must be
reseated after the Tone-Clock is reinstalled.) Refer to Procedure 3 on page
removing and reinserting a PN’s control circuit packs
on page 242 for the TN768, TN780,
or TN2182 Tone-Clock circuit pack in a high- or critical-reliability system.
If the packet-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 caused the problem. If the
backplane pins are intact, replace the circuit pack. Keep in mind that there may be more than one failure
cause.
In
Procedure 2: removing and reinserting port circuit packs
on page 241, you may try one circuit pack at
a time, or multiple circuit packs simultaneously. The allowable level of service disruption should guide
this choice. If the entire PN can be disrupted, trying large groups of circuit packs will save time. If traffic
is heavy, trying one circuit pack at a time is slow but will minimize outages.
If the TN771D’s stand-alone mode does not indicate packet-bus faults, perform Procedure 2 for only the
port circuit packs (purple slots) listed in
Table 64, Packet circuit packs,
on page 240 in Procedure 1. In
this case, you need not check for problems with the backplane pins. It is sufficient to determine whether
the problem is resolved by removing circuit packs.
If you decide to remove multiple circuit packs, consider working with an entire carrier at a time to more
quickly and reliably determine which circuit packs are not the source of trouble. Any circuit packs
(packet or non-packet) that have been recently inserted should be checked first. Packet circuit packs
should be checked before non-packet circuit packs.
1
Remove one or several circuit packs.
2
Determine whether the packet-bus fault is still present. If not, go to Step 4.
Universal DS1
TN464F
UDS1-BD, ISDN-LNK
IP Server Interface
(IPSI)
TN2312A
P
PKT-INT
Expansion Interface
TN570
EXP-INTF
Table 64: Packet circuit packs
Circuit Pack Name
Code
Associated maintenance objects
Summary of Contents for CMC1
Page 1: ...Maintenance Procedures 555 245 103 Issue 1 1 December 2003 ...
Page 14: ...Contents 14 Maintenance Procedures December 2003 ...
Page 416: ...Additional maintenance procedures IP Telephones 416 Maintenance Procedures December 2003 ...
Page 426: ...Index X 426 Maintenance Procedures December 2003 ...
