DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-936ISDN-LNK (ISDN-PRI Signaling Link Port)
9
ISDN-LNK (ISDN-PRI Signaling Link
Port)
NOTE:
See the figures in the ‘‘ISDN-SGR (ISDN-PRI Signaling Group)’’ sec tion of
this chapter for an illustration of the p rinciples desc ribed below.
The ISDN-PRI interface uses out-of-band signaling (a s oppose d to robbed-bit,
in-band signaling ) to transmit control messages b etween two endpoints. User
information channels carry d igitized voice and digital d ata 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 comb ined 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 d irect interface to the pac ket bus which
carries D-channel messages to the processor. The associated B-channels can
use ports on the same circu it pack or ports on o ther TN464C/Ds or TN767 DS1
Interface circuit p acks. (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 c hannel on a 2.048 Mbps link
The 32-channel mode is supp orted only on TN464 series circuit p acks
and on G3r V2 systems.
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-c hannel 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 c hannel (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.
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-PRI Signaling
Link Port
ISDN-LNK WARNING test port
UUCSSpp
sh ISDN-PRI Signaling
Link Port