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PKT-INT (Packet Interface)
Issue 5 October 2002
1465
555-233-119
Packet Interface Replacement
To replace a Packet Interface, follow the procedure to replace the TN2402/TN798
Processor circuit pack:
■
Power down the system.
■
Replace the TN2402/TN798 Processor circuit pack.
■
Power the system back up.
Demand Reset of a Packet Interface
System software denies a demand reset of a Packet Interface (reset
packet-interface) if the Packet Interface is in service. A reset would disrupt
service, existing calls, and links to adjuncts such as AUDIX. The software that
controls Packet Interface maintenance puts a Packet Interface in the
out-of-service state if that Packet Interface has been reset four times within the
last 15 minutes, as part of the automatic recovery action that is initiated when a
hardware fatal fault condition is detected.
Service States
Packet Interface maintenance software monitors the in-service/out-of-service
state of each Packet Interface instance. If maintenance software detects that a
Packet Interface instance has a “fatal fault,” it automatically attempts to reset that
instance as quickly as possible. An extensive set of diagnostic tests are run when
a Packet Interface is reset.
If the Packet Interface diagnostic tests do not pass, the failing Packet Interface
instance is placed in an out-of-service state. All links handled by that instance go
out of service, except for those than can be transferred or “migrated” to the other
Packet Interface instance.
A Packet Interface also is put in the “out-of-service” state if it has reported a fatal
fault at system initialization time or if the Packet Interface has been reset by
background maintenance four times within the last 15 minutes, whether or not the
Reset test passes. The state of both Packet Interfaces can be determined by
using the status packet-interface command.
Maintenance Object Interactions
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Packet Bus Maintenance
Packet Interface 2 physically interacts with the PKT-BUS (Packet Bus)
through the TDM Bus and the C-LAN circuit pack’s Bus Bridge circuitry. For
certain types of Packet Interface errors, it may be difficult to isolate the fault
to one of these four interconnected components. In these cases, Packet
Interface maintenance will forward the error report to the Packet Bus
maintenance, thus causing Packet Bus maintenance to record a Packet
Bus fault in the hardware error log and to run appropriate Packet Bus tests.