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 between two endpoints. User
information channels carry digitized 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 pack, which has a direct interface to the packet bus which
carries D-channel messages to the processor. The associated B-channels can
use ports on the same circuit pack or ports on other TN464C/Ds or TN767 DS1
Interface circuit packs. (The TN722 cannot be used for this application). 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 channel on a 2.048 Mbps link
On 24-channel interfaces, the B-channels may use any of the first 23 ports. The
signaling link is assigned to the 24th port. On 32-channel interfaces, the DS1
ISDN Trunks (B-channels) may use any of ports 1 to 15 and 17 through 31. The
signaling link is assigned to the 16th port. The 32nd channel (port 0) is used for
framing. In NFAS configurations, the 24th or 16th ports on some of the DS1 circuit
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 call control information can be conveyed to the
far-end switch or terminal adapter. Stable calls may remain operational, but no
new calls can be made. The ISDN-LNK in turn depends on the TN464C/D UDS1
Interface circuit pack it resides on and the packet bus which provides 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 Run
1
1. pp is
24
for 24-channel interfaces and
16
for 32-channel interfaces>
Full Name of MO
ISDN-LNK
2
2. For additional related information, see "UDS1-BD (UDS1 Interface Circuit Pack)"
MINOR test port
UUCSSpp
l ISDN-PRI Signaling Link Port
ISDN-LNK WARNING test port
UUCSSpp
sh ISDN-PRI Signaling Link Port
