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PE-BCHL (PRI Endpoint Port)
Issue 1 June 2005 1775
Figure 102: PRI Endpoint Port Interactions
PRI Endpoint Port Service States
The status pri-endpoint extension command displays the following possible service
states for PRI endpoint ports. The table that follows gives recommended procedures for each
state. The figure following that shows typical progressions from one service state to another.
Refer also to Troubleshooting ISDN-PRI endpoints (wideband)
in Maintenance Procedures
(03-300192) for a layered approach to addressing PRI endpoint problems.
● 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 first administered. The switch then 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
port remains out of service, and maintenance will periodically resend the messages. The
port is unusable for incoming and outgoing calls, although other ports in the PRI endpoint
can still be used.
● Out-of-Service/Near-End (OOS/NE)
This is the state of the port when a hardware failure exists on the signaling link, the NPE
Crosstalk test fails, or when the port is busied out by command. In this state, the port is
unusable for calls coming into the switch or going out to the terminal adapter, although other
MSSNET
Circuit
Pack
(UN332)
Packet
Bus
TDM
Bus
PKTINT
Circuit
Pack
(TN1655)
Processor
(UN331)
UDS1
Interface
Circuit
Pack
(TN464C)
Terminal
Adapter
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Signaling
(Port 24)
ISDN-LNK
PE-BCHL
PE-BCHL
Data
Data
(Port 1)
(Port 23)