PKT-BUS (Packet Bus)
Issue 4 May 2002
10-1267555-233-123
i. The Maintenance/Test Packet Bus port for this port network is not in
service. This error appears only in a Critical Reliability system, and it can
occur in the following cases:
■ The Packet Bus port has been busied out (indicated by an Error
Type 18), and a Warning alarm is active in the same port network.
Release the port by entering the release port PCSS04 command.
■ The Packet Bus port has failed. Resolve any alarms.
■ The Maintenance/Test circuit pack was not recognized by the
system at the last system restart. Replace the Maintenance/Test
circuit pack. There is no Maintenance/Test circuit pack installed in
this port network. One must be installed.
System Technician-Demanded Tests: Descriptions
and Error Codes
Always investigate tests in the order presented in the following tables when you
are inspecting errors in the system. By clearing error codes associated with the
Packet Circuit Pack Audit Test, for example, you may also clear errors generated
from other tests in the testing sequence.
Packet Control Bus Loop Around Test (#571)
This test uses circuitry on the Packet Control circuit pack (TN778) to look for faults
on the Packet Bus. If the Packet Control circuit pack has detected parity errors on
the Packet Bus, or if it is unable to loop back data to itself, the test fails. The test
passes if no parity errors are detected and if data is successfully looped back.
This test provides information only for the PPN of a standard system. If the test is
run in an EPN or in the PPN of a High or Critical Reliability system, the test aborts.
This test is available only in pre-R7si systems.
Order of Investigation
Short Test
Sequence
Long Test
Sequence
D/
ND
1
1 D = Destructive; ND = Nondestructive
**} This test is only available in pre-R7si systems.
Packet Circuit Pack Audit Test (#573) X X ND
Maintenance/Test Circuit Pack Query Test (#572) X X ND
Packet Control Bus Loop Around Test (#571)** X X ND
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