User Guide

DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-1084PKT-BUS (Packet Bus)
10
Notes:
a. Within the last minute, packet circuit packs have reported errors that
indicate a possible Packet Bus failure. The Aux Data value is 1 or 2,
indicating that only one or more than one Packet circuit pack
(respectively) have reported a possible Packet Bus failure.
b. Packet Bus maintenance has been unable to perform loop around tests
from the TN778 Packet Control circuit pack (PKT-CTRL) to itself. This
could indicate faults on the Packet Control circuit pack rather than on the
Packet Bus. Examine the Error and Alarm Logs for any such errors.
c. The Maintenance/Test Packet Bus port for this port network has
determined that there are more Packet Bus faults than the port can
correct. The Aux Data value indicates the number of faulty leads.
d. Packet circuit packs have detected possible Packet Bus failures via in-line
error or background test failure. Examine the Error and Alarm logs for
more specific PKT-BUS errors.
e. The Maintenance/Test Packet Bus port has caused Packet Bus leads to
be swapped to spare leads. This error appears only in a High or Critical
Reliability system. The Aux Data value indicates the number of faulty
leads. If this is the only active error against the Packet Bus, the Packet
Bus is still in service. Therefore, due to the disruptive nature of the
Packet Bus Fault Isolation and Correction procedures, repairs should be
deferred until a time when these procedures cause the least interruption in
service. This matter is resolved via consultation with the customer.
However, be sure not to delay repairs for too long, since the switch is not
able to recover from another Packet Bus failure until the existing one is
resolved. The procedure described in the section entitled "Special
Precaution Concerning the TN771" in Chapter 9, ‘‘
Packet Bus Fault
Isolation and Correction’’ is used to ensure that the Maintenance/Test is
giving correct information. This procedure may require that a new TN771
be taken to the customer site.
f. The Maintenance/Test Packet Bus port has detected open leads on the
Packet Bus. The Aux Data value indicates the number of open leads.
g. Packet circuit pack, port, and endpoint maintenance has been disabled
due to a Packet Bus failure. The Aux Data value indicates which sources
have reported errors that have caused maintenance to be disabled. These
sources include the following:
■ In-line errors from Packet circuit packs.
■ Packet Bus Uncorrectable report from the Maintenance/Test Packet
Bus port.
■ Packet Bus Interface Failure report from the Packet Control.
■ In an EPN, packet circuit pack, port, and endpoint maintenance will
be disabled if a Packet Bus failure occurs in the PPN.