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Maintenance Object Repair Procedures
555-233-123 10-1310 Issue 4 May 2002
Maintenance Looparound Test (#886)
This test checks whether the Packet Interface can send and receive data
correctly. It establishes a LAPD link from a Packet Interface back to the same
Packet Interface and transmits and receives test data over that testing link. While
timing signals from the Packet Bus are used for the data transfer, the data itself is
looped around on the TN2401/TN794 NetPkt circuit pack at the interface to the
Packet Bus and does not get sent over the Packet Bus. This test is run only on the
second instance of Packet Interface on the TN2401/TN794 NetPkt, since the first
instance cannot use the Packet Bus.
NOTE:
This test is not run if the Packet Interface is on a standby SPE in a system
equipped with duplicated SPEs. However, a failure of the Maintenance
Looparound test may have caused an SPE interchange which would result
in an alarm associated with the looparound failure error code 769 being
reported against a Packet Interface that is currently on the standby SPE. If
that is the case, and if all other Packet Interface tests associated with the
test packet-interface CS long pass, force the standby SPE to go active by
using the SPE-SELECT switches. Then enter the test packet-interface CS
command to run the Maintenance Looparound test to make sure the
problem has been cleared.
PASS All the private looparound tests passed. The Packet Interface is
functioning properly. If the system is still unable to place calls on
cabinets other than the SPE cabinet, then:
1. Display the error log (display errors) and check for errors
on the Packet Bus and Maintenance/Test circuit pack. Clear
those errors first.
2. Check all other circuit packs connected to the Packet Bus in
the same cabinet. Packet Bus failures are likely to be
caused by a faulty circuit pack connected to the backplane
or bent pins on the back plane. Refer to the PKT-BUS
maintenance documentation for repair procedures.
Table 10-485. TEST #885 Private Looparound Tests — Continued
Error
Code Test
Result Description/Recommendation
Continued on next page