Avaya S8700 Series, Maintenance Manual

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Maintenance-Object Repair Procedures
555-233-143 8-970 Issue 1 May 2002
ISDN-LNK (ISDN-PRI Signaling Link
Port)
NOTE:
See the figures in the ‘‘ISDN-SGR (ISDN-PRI Signaling Group)’’ section of
this chapter 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-LNK) is a port on a TN464C/D 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/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 ch 1 framing channel on a 2.048-Mbps link
The 32-channel mode is supported only on TN464 series circuit packs and
on G3r V2 systems.
On 24-channel interfaces, the B channels may use any of the first 23 ports. The
signaling link is assigned to the 24
th
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 16
th
port. The 32
nd
channel (port 0) is used for
framing. In NFAS configurations, the 24
th
or 16
th
ports on some of the DS1 circuit
packs may be used for B channels. See ‘‘ISDN-SGR (ISDN-PRI Signaling
Group)’’ for further information.
MO’s 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