Administering Isdn Trunk Groups - Avaya Communication Manager Administrator's Manual

Administering ISDN Trunk Groups

Integrated Services Digital Network (ISDN) trunk groups support the ISDN and Call-by-Call
Service Selection service selection features. The trunk group provides end-to-end digital
connectivity and supports a wide range of services including voice and non-voice services, to
which users have access by a limited set of CCITT-defined, standard multipurpose interfaces.
The ISDN trunk group may contain ISDN-PRI or ISDN-BRI interfaces. However, it is not
possible to use the two types of interfaces in the same trunk groups. The type of interface is
chosen when the trunk members are assigned to the trunk group.
When ISDN-PRI interfaces are used on ISDN trunk groups, they may also be used to support
the Wideband Switching feature. This is intended to work with the H0 (384 Kbps), H11 (1536
Kbps), H12 (1920 Kbps), and NXDS0 (128 to 1984 Kbps) data services, and to support
high-speed video conferencing and data applications.
When an ISDN trunk connects two servers or switches, set the trunk options identically at both
ends of the connection, with the exception of the Trunk Hunt fields. When ISDN-PRI interfaces
are used, it is acceptable for both ends to have the Trunk Hunt fields administered as cyclical,
but if one end is administered as ascend, the other end must be administered as descend.
This helps avoid the possibility of glare conditions. When ISDN-BRI is used, the Trunk Hunt
field has to be cyclical.
Hardware requirements
ISDN-BRI interfaces are supported by the TN2185 Trunk-side BRI circuit pack (for
implementing the user side of the BRI interface) and by the TN556B or TN556C ISDN-BRI Line
circuit pack or the TN2198 ISDN BRI (U-LT) Line circuit pack (for the network side of the BRI
interface). The TN2464 circuit supports T1 and E1 digital facilities.
ISDN-PRI interfaces are supported by the TN767 circuit pack (for assignment of a T1 signaling
link and up to 24 ISDN-PRI trunk group members), or the TN464C or later circuit pack (for
assignment of a T1 or E1 signaling link and up to 24 or 31 ISDN-PRI trunk group members,
respectively). The TN2464 and TN2207 circuit pack can also be used with ISDN-PRI.
The D-channel for ISDN-PRI interfaces switches through either the TN765 Processor
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Interface (PI) circuit pack or the TN778 Packet Control (PACCON) circuit pack. The
D-channel for ISDN-BRI interfaces only switches through the TN778 Packet Control
(PACCON) circuit pack.
Note:
You cannot use the TN765 circuit pack with ISDN-BRI interfaces.
Note:
A TN780 or TN2182 Tone Clock circuit pack provides synchronization for the DS1 circuit
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pack.
Administering ISDN Trunk Groups
Issue 1 June 2005 447