Filter
Top Products
DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Packet Bus Fault Isolation and Correction
Page 9-9Maintenance of the Packet Bus
9
These interactions allow normal, non-Packet, system traffic to continue
unaffected, and they reduce the number of extraneous entries into the
Error/Alarm Logs. If the Packet Bus failure is caused by a failed circuit pack, the
circuit pack should appear in the Error/Alarm Logs, which aids in fault isolation.
The following events indicate a Packet Bus failure that requires the actions in the
previous paragraph to occur:
■ In-line errors that indicate a possible Packet Bus failure reported by two or
more Packet circuit packs
■ Packet Bus Uncorrectable report from the Maintenance/Test Packet Bus
port (M/T-PKT)
■ Packet Bus Interface Failure from the Packet Control (PKT-CTRL)
If such a failure occurs, this information will be available in an Error Log entry for
PKT-BUS. Refer to the PKT-BUS section in Chapter 10, ‘‘
Maintenance Object
Repair Procedures’’, for more detailed information.
Overview of Fault Correction Procedures
This section gives an overview of the procedures used to (1) isolate the cause of
Packet Bus faults and to (2) correct the Packet Bus faults. These procedures are
applicable to High and Critical Reliability systems, and they are detailed fully
later in this chapter:
1. The first procedure attempts to determine if a circuit pack that interfaces
to the Packet Bus is the cause of the Packet Bus problem. The error and
alarm logs are examined for entries for these circuit packs, and the normal
maintenance procedures for those circuit packs are attempted.
2. If the Packet Bus problem still exists, port circuit packs (those in the
purple slots) are removed to look for circuit pack(s) that have failed and/or
have damaged the Packet Bus pins (a diagram of the backplane pins is
provided later).
3. If the Packet Bus problem is still not resolved, the same procedure is
attempted for the control complex circuit packs.
4. If the problem is still not resolved, or if the Packet Bus faults are known to
have open leads, a procedure is undertaken in which the bus terminators
and cables are replaced. If this does not resolve the problem, the carrier
connectivity of the port network is reconfigured to attempt to isolate a
faulty carrier.