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ISDN-LNK (ISDN-PRI Signaling Link Port)
Issue 4 May 2002 10-935 555-233-123
In a 32 channel system, the DS1/UDS1 ISDN Trunk or PRI endpoint port
(B-channels) may use any of the ports 1-15 or 17-31, but the ISDN-PRI Signaling
Link Port must be the 16th port. In certain configurations (NFAS), the 16th port
may be used as a B-channel. Refer to the ISDN-PRI Signaling Group
(ISDN-SGR) Maintenance documentation for further details.
ISDN-LNK handles maintenance and recovery for the D-channel port on the DS1
carrying the signaling link. A problem with the ISDN-PRI Signaling Link Port
(D-channel) has an effect on all of the associated DS1 ISDN Trunks or PRI
endpoint ports (B-channels) since no call control information can be conveyed to
the far-end switch without it. Stable calls may remain operational, but no new calls
can be made.
The ISDN-PRI Signaling Link Port itself depends on two other entities: the
DS1/UDS1 Interface circuit pack it resides on, and the Processor Interface Link
that provides the link to the processor. If there are problems with the ISDN-PRI
Signaling Link Port, also investigate the DS1/UDS1 interface circuit pack and the
Processor Interface Link.
Figure 10-34. ISDN-PRI Signaling Link Port Interactions (32-Channel)
PROCESSOR
(TN773/TN786)
PI
CIRCUIT
PACK
(TN765)
UDS1
INTERFACE
CIRCUIT
PACK
(PORT 0)
FRAMING
ISDN-TRK
VOICE OR DATA
(PORT 15)
ISDN-TRK
(PORT 31)
VOICE OR DATA
ISDN-LNK
(PORT 16)
PRIMARY SIGNALING
LINK
ISDN-TRK
VOICE OR DATA
(PORT 17)
ISDN-TRK
VOICE OR DATA
(PORT 1)
•
•
•
•
•
•
PI-LINK
BUS
TDM