Maintenance Object Repair Procedures
555-233-123
10-1276 Issue 4 May 2002
c. This error indicates that a loss of communication was detected between
the SPE software and the Packet Control circuit pack. No alarm is raised.
However, if this error occurs repeatedly, software testing escalates to the
Reset Test (#586) so that the health of the Packet Control circuit pack can
be determined.
d. This error occurs when the Packet Control Loop Around Test (#585) fails
because a link cannot be established or because the Packet Control circuit
pack cannot send and receive data correctly. No alarm is raised. However,
if this error occurs repeatedly, software testing escalates to the Reset Test
(#586) so that the health of the Packet Control circuit pack can be
determined.
e. This error occurs when the Packet Control Parity Circuitry Test (#584) fails,
thus indicating a possible fault with the parity circuitry in detecting Packet
Bus parity errors. If this error occurs a number of times exceeding a
defined threshold, a minor on-board alarm is raised.
f. This error occurs when a certain circuit pack-level diagnostic test fails, thus
indicating a transient fault (which has been recovered) existed on the
Packet Control/Packet Bus interface. No alarm is raised because the error
does not isolate the fault to the Packet Control circuit pack. However, if the
error occurs repeatedly, software testing escalates to the Reset Test (#586)
so that the health of the Packet Control circuit pack can be determined.
g. This error occurs when a certain circuit pack-level diagnostic test fails,
indicating there is a fault on the Packet Control/Packet Bus interface. No
alarm is raised because the Packet Bus may be the source of problem.
When this error occurs, Packet Bus maintenance is notified, thereby
causing appropriate tests to run.
h. This error occurs when a parity error is detected by the Packet Control
circuit pack, indicating some data sent over the Packet Bus is corrupted.
No alarm is raised against the Packet Control circuit pack because the
problem may be associated with the Packet Bus. When this error occurs,
Packet Bus maintenance is notified, thereby causing appropriate tests to
run.
i. This error occurs when the Packet Control circuit pack receives a threshold
number of frames with invalid address. No alarm is raised because there is
no direct indication of a Packet Control fault. The frames may be corrupted
by the sending side or by the Packet Bus. No maintenance activity is
triggered by this error. No action is required.
j. This error occurs when the Packet Control Download Test (#581) fails.
Once a threshold number of these errors occur, a major off-board alarm is
raised. Maintenance software retries the download test repeatedly until it
passes. Since the reset packet-control C command causes the firmware
to be downloaded and provides additional diagnostics on this error type,
this command should be used when a download failure has occurred.
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