Server Alarms - Avaya Support

Communication Manager Maintenance Object Repair Procedures
ISDN-PLK (ISDN-PRI Signaling Link Port)
MO Name in Log Alarm
Level
Initial Command to Run 1
Full Name of MO
ISDN-PLK MIN test port location l ISDN-PRI Signaling Link port
WRN test port location
1. location refers to the port board location and port number. The port number is either 24 for 24-channel
interfaces or 16 for 32-channel interfaces.
This MO was formerly known as “ISDN-LNK (ISDN-PRI Signaling Link Port)”.
Note:
Note: See the figures in ISDN-SGR (ISDN-PRI Signaling Group) for an illustration of
the principles described below.
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-PLK) is a port on a TN464C or higher suffix UDS1
Interface circuit pack that has a direct interface to the packet bus that carries D-channel
messages to the processor. The associated B-Channels can use ports on the same circuit pack
or ports on other TN464C or higher suffix 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
The TN767 DS1 interface is used for 24 channel 1.544 Mbps systems. The TN464F/GP can be
used for either 24 or 32 channel systems. The 32-channel (31 DS0 channels + 1 framing
channel on a 2.048 Mbps link) are only supported on TN464 series circuit packs. A description
of these circuit packs appears in DS1-BD or UDS1-BD maintenance documentation.
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 the ports 1 to 15
and 17-31. The signaling link is assigned to the 16th port. The 32nd channel (port 0) is used for
framing.
In NFAS configurations, the 16th or 24th ports on some of the DS1 circuit packs may be used
for B-Channels. Refer to ISDN-SGR (ISDN-PRI Signaling Group) for further details.
916 Maintenance Alarms for Avaya Communication Manager, Media Gateways and Servers