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PKT-BUS (Packet Bus)
Issue 1 June 2005 1793
e. Error Type 2049: S8700 MC: The Maintenance/Test packet bus port (M/T-PKT) has detected
a Packet Bus fault and has taken corrective action by swapping to spare leads. This error
appears only in high/critical-reliability systems (duplicated PNC). 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. Due to the disruptive nature of the packet bus Fault
Isolation and Correction procedures, repairs should be deferred until a time when the least
interruption in service would result. This should be determined by consultation with the
customer. However, do not delay repairs for too long, since the switch cannot recover from
another packet bus failure until the current one is resolved. Isolating and repairing
packet-bus faults in Maintenance Procedures (03-300192) contains a sub-section, A
Special Precaution Concerning the TN771D that describes how to ensure that the TN771D
is providing correct information. A new TN771D may need to be taken to the customer site.
f. Error Type 2305: The Maintenance/Test packet bus port (M/T-PKT) has detected open
leads on the packet bus. The Aux Data value indicates the number of open leads.
g. Error Type 3329: Packet circuit pack, port, and endpoint maintenance has been disabled
due to a packet bus failure. The Aux Data value indicates the cause:
Keep in mind that although only packet circuit packs can detect and report packet bus
problems, such problems can be caused by any circuit pack.
h. Error Type 3585: Packet circuit pack, port, and endpoint maintenance has been disabled
due to more than one circuit pack reporting in-line errors. If this occurs more than three
times in 15 minutes a Minor alarm is raised against the packet bus. This happens when
maintenance is disabled due to errors and is then re-enabled because no more errors are
reported.
This error may still be present in the error log even though the Packet Circuit Pack Audit test
(#573) indicates that only one circuit pack is reporting a problem. This happens when more
than one circuit pack has reported errors in any 1-minute interval since the packet bus fault
occurred.
i. Error Type 3841: The Maintenance/Test packet bus port (M/T-PKT) for this port network is
not in service. This alarm does not appear for PNs in standard- or high-reliability systems
since a TN771D is not required there. The error indicates one or more of the following:
Aux Data Cause
1 In-line errors from packet circuit packs
2 Uncorrectable packet-bus fault reported
Maintenance/Test packet-bus port (M/T-PKT)
3 Both of the above
100x Packet-related circuit pack, port, and endpoint maintenance in the
PN has been disabled due to a packet-bus failure in the PN. The
last digit has the same meaning as the single digits listed above.