DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127 Issue 1
August 1997
Maintenance Object Repair Procedures
Page10-702ISDN-LNK (ISDN-PRI Signaling Link Port)
10
ISDN-LNK (ISDN-PRI Signaling Link Port)
NOTE:
Use this Maintenance Object (ISDN-LNK) for maintenance tests, alarms,
and hardware errors when the “ISDN-PRI over PACCON” option on the

system-parameters customer

form is set to a “n”. When the ISDN PRI over
PACCON is set to “y” use Maintenance Object ISDN-PLK.
When the ISDN-PRI over PACCON option is set to “n”, the ISDN-PRI D-cha nnel
call control messages are transmitted over the TDM bus to the Processor
Interface circuit pack and you must use this Maintenance O bject for PRI Link
problems.
An ISDN-PRI Signaling Link is known as a D-channel. D-channels are used to
transmit call control signaling for B-channels. The call control signa ling for the
B-channels is combined and carried over separate ISDN-PRI D-channels. User
information (for example, digitized voice, digital data) channels are known as
bearer channels (B-channels); DS1 ISDN Trunks are B-channels and they carry
the user traffic. PRI endpoint ports are also B-channels that can carry Wideband
traffic.
The ISDN-PRI Signaling Link Port (ISDN-LNK) and the associated DS1/UDS1
ISDN Trunk (ISDN-TRK) or PRI endpoint port (PE-BCHL) use ports on a TN767 or
TN464B or later DS1/UDS1 interface circuit pack (the TN722 cannot be used for
this application). The TN767 is used for 24 channel 1.544 Mbp s systems. The
TN464B is used for 32 channel 2.048 Mbps systems. The TN464C or later can be
used for either 24 or 32 channel systems. A description of these circuit packs
appears in “DS1-BD” or “UDS1-BD”.
In a 24 channel system, the DS1 ISDN Trunk or PRI endpoint port (B-channels)
may use any of the first 23 ports. The ISDN-PRI Signaling Link Port must be the
24th port. In certain configurations (NFAS), the 24th port may be used as a
B-channel. Refer to “ISDN-PRI Signaling Group” for further details.
1. Where ’pp’ is ’24’ for 24-channel interfaces, and ’16’ for 32-channel interfaces.
2. For additional repair information, see also DS1-BD (DS1 Interface Circuit Pack) or UDS1-BD
(Universal DS1 Interface Circuit Pack) Maintenance documentation.
MO Name (in
Alarm Log) Alarm
Level Initial Command to Run1Full Name of MO
ISDN-LNK2MINOR test port PCSSpp l ISDN-PRI Signaling Link Port
ISDN-LNK WARNING test port PCSSpp sh ISDN-PRI Signaling Link Port