DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-104Packet Bus Fault Isolation and Repair
5
NOTE:
The Tone/Clock circuit pack should b e the next-to-last one checked . (The
TN771D must be reseated after the Tone/Clock is reinstalled.) Refer to
Procedure 3 for the TN768 or TN780 Tone/Clock circuit pack in a PPN with
dup lica ted SPEs .
If the packet bus p roblem is present when the circ uit pack is inserted, but is
resolved when the circuit pa ck is removed, either the circuit p ack or the
backplane p ins in that slot caused the prob lem. If the backpla ne pins are intact,
replace the circuit p ack. Keep in mind that there may be more than one failure
cause.
In Procedure 2, you may try one circuit pack at a time, or multiple c ircuit packs
simultaneously. The allowable level of service disrup tion should guide t his
choice. If the entire port networ k can be disrup ted, trying large g roups of circuit
packs will save time. If traffic is heavy, trying 1 circuit pac k at a time is slow but
will minimize outages.
If the TN771D Standalone mode does
not
indicate pac ket bus faults, perform
Procedure 2 for
only the port
circuit pack s (purple slots) listed i n Table 5-8 in
Procedure 1. In this case, you need no t check for problems with the backplane
pins. It is sufficient to deter mine whether the problem is resolved b y removing
circuit packs.
If you decide to remove multip le circuit pac ks, consider working with a n entire
carrier at a time to more quickly an d reliably determine whic h circuit pac ks are
not
the source of trouble. Any circ uit packs, (pac ket or non-packet), that have
been recently inserted shou ld be checked first. Packet circuit pa cks should be
checked before non-packet circuit packs .
1. Remove one or several circuit pac ks.
2. Determine if the packet b us fault is still present. If not, go to step 4.
3. If the packet bus fault is still present:
a. Determine if the backpl ane pins in the removed circ uit pack’s slot
are bent using the output from the Mainte nance/Test standalone
mode and the bac kplane illustrations which ap pear earlier in this
discussion.
b. If the backplane pins are bent:
Power down the carrier (see ‘‘Replacing a BIU or Rectifier’’),
straighten or replace the p ins, reinsert the circuit p ack and restore
power. Repeat Step 2 for the same circuit pack.
c. If the backpl ane pins are not bent:
Reinsert the circuit pack(s), and repeat this proced ure for the next
set of circuit pac ks.