Packet and serial bus maintenance
S8100 packet bus fault isolation and repair
Maintenance Procedures
245
December 2003
Procedure 4 consists of two parts.
on page 245 attempts to clear the packet-bus fault by replacing
every bus cable and terminator within a PN.
on page 245 attempts to isolate the fault to a particular
carrier by extending the packet bus from the control carrier to additional carriers one at a time.
Part 1
1
Power down the PN.
2
Replace every TDM/LAN cable assembly and both of its TDM/LAN terminators.
3
Restore power to the PN.
4
Determine whether the packet-bus fault is still present.
5
If the packet-bus fault is resolved, the procedure is completed. Otherwise, go to
Part 2
1
Place the Maintenance/Test circuit pack into the carrier where the active EI circuit pack resides to
isolate the failure to the smallest possible number of carriers.
2
Power down the cabinet and terminate the packet bus on the carrier with the Maintenance/Test
(M/T) and active EI.
3
Determine whether the packet-bus fault is still present. If so, and if there are shorts on the packet
bus, perform
Procedure 2: removing and reinserting port circuit packs
and/or
removing and reinserting a PN’s control circuit packs
for only the circuit packs in carriers
connected to the “shortened” packet bus.
4
If the packet-bus fault is not present, extend the packet bus to another carrier, and repeat the
procedure in the previous step. When a carrier that causes the fault to recur is added, and if there
are shorts, perform
Procedure 2: removing and reinserting port circuit packs
and/or
removing and reinserting a PN’s control circuit packs
for only the circuit packs in that carrier.
5
If the packet-bus fault recurs as the packet bus is extended, and if there are no shorts, and
Procedures 2 and 3 do not resolve the problem, the added carrier(s) that caused the problem to
recur are defective and must be replaced.
8100 only
S8100 packet bus fault isolation and repair
NOTE:
See // for fault isolation and repair procedures for all other systems.
This chapter describes the fault isolation/correction procedures for the Packet Bus and for the various
MOs that use the Packet Bus. Because the Packet Bus is shared by all circuit packs that must
communicate on it, a faulty circuit pack can disrupt communication over the Packet Bus. In addition, a
circuit pack that does not use the Packet Bus can cause service disruptions if the physical configuration of
the switch is being modified (this is discussed in more detail later). For these reasons, isolating the cause
of Packet Bus failure can be complicated. In this chapter, a flowchart is provided to aid in this isolation
effort, as are detailed discussions of the tools and procedures used in the fault isolation and correction.
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 ...
