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PE-BCHL (PRI Endpoint Port)
Issue 5 October 2002
1437
555-233-119
PRI Endpoint Port Service States
This section defines the possible service states of a PRI Endpoint Port, and it
explains the reason for each service state. This section also provides the
recommended recovery procedures (when required).
Service States
■
In-Service (INS)
The B-channel is in its normal operating state.
■
Out-of-Service/Far-end (OOS/FE)
A B-channel is initialized to this state when administered. The switch sends
messages to the far-end terminal adapter to negotiate the B-channel into
service. If the far-end terminal adapter does not respond to the messages
within a certain time period, the service state remains out-of-service, and
maintenance periodically resends the messages. The port is unusable for
calls incoming to the switch and outgoing to the terminal adapter (although
other ports in the PRI Endpoint can still be used for incoming and outgoing
calls).
■
Out-of-Service/Near-end (OOS/NE)
This is the state of the port whenever one of the following is true: a
hardware failure exists on the signaling link, the NPE Crosstalk Test fails,
or the port is busied out by system technician. In this state, the port is
unusable for calls incoming to the switch or outgoing to the terminal
adapter (although other ports in the PRI Endpoint can still be used for
incoming and outgoing calls). No messages are sent to the far-end terminal
adapter until the signaling link comes back into service or until the port is
released by system technician.
■
Maintenance/Far-end (MTC/FE)
This state is reached when the far-end terminal adapter does not respond
to messages sent over the signaling link for a particular port after a certain
amount of time. This state is different from OOS/FE inasmuch as the
signaling link must be up initially and the B-channels must be in-service.
The switch periodically sends messages to the far-end terminal adapter in
an attempt to negotiate the port (B-channel) into service. The port is
unusable for calls outgoing to the terminal adapter. However, the port
services incoming call requests from the far-end (although other ports of
the PRI Endpoint can still be used to answer calls incoming to the switch or
to place outgoing calls to the terminal adapter). Note that transitions into
MTC/FE do not drop stable calls. Therefore, if the service state changes
from in-service to MTC/FE, stable calls are unaffected.