DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-931ISDN-PLK (ISDN-PRI Signaling Link Port)
9
ISDN-PLK (ISDN-PRI Signaling Link
Port)
NOTE:
This MO was formerly known as "ISDN-LNK (ISDN-PRI Signaling Link Port)".
The ISDN-PRI interface uses out-of-band signaling (as opposed to robbed-bit,
in-band signaling ) to transmit control messages b etween two endpoints. User
information channels carry d igitized voice and digital data and are known as
bearer channels (B-channels) . B-channels are assigned to DS1 ISDN trunks or
PRI endpoints. Call control signaling for the B-channels is combined and carried
over the separate ISDN-PRI Signaling Link Port D-channel.
The ISDN-PRI Signaling Link Port (ISDN-LNK) is a port on a TN464C/D UDS1
Interface circuit p ack, which has a direc t interface to the packet b us which
carries D-channel messages to the processor. The associated B-c hannels can
use ports on the same circu it pack or ports on other TN464C/Ds or TN767 DS1
Interface circuit p acks. (The TN722 cannot be used for this ap plication). The
B-channels are connected to the TDM Bus.
Two types of DS1 interfaces exist:
■24 DS0 channels on a 1.544 Mbps link
■31 DS0 channels + 1 framing c hannel on a 2.048 Mbps link
On 24-channel interfaces, the B-c hannels may use any of the first 23 ports. The
signaling link is assigne d to the 24th port. On 32-chann el interfaces, the DS1
ISDN Trunks (B-channels) may use any of ports 1 to 15 and 17 through 31. The
signaling link is assigne d to the 16th port. The 32nd chan nel (port 0) is used for
framing. In NFAS configurations, the 24th or 16th ports on some of the DS1 circ uit
packs may be used for B-channels. Refer to ISDN-SGR for further information.
A problem with the ISDN-LNK will have an effect on all of the associated
B-channels since without it no c all control information can be c onveyed to the
far-end switch or terminal ad apter. Stable calls may remain op erational, but no
new calls can be mad e. The ISDN-LNK in turn depends on the TN464C/D UDS1
Interface circuit p ack it resides on and the p acket bus which p rovides the link to
the processor. If there are problems with the ISDN-LNK, also investigate the
MO Name (in
Alarm Log) Alarm
Level Initial Command to Run1
1. pp is
24
for 24-channel interfaces and
16
for 32-channel interfaces>
Full Name of MO
ISDN-LNK2
2. For additional related information, see "UDS1-BD (UDS1 Interface Circuit Pack)"
MINOR test port
UUCSSpp
l ISDN- PR I Sign aling Link Port
ISDN-LNK WARNING test port
UUCSSpp
sh ISDN-PRI Signaling Link Port