Administrator's Guide

ManualsBrandsAvaya ManualsBasic Administration ToolsAvaya MultiVantage Software Release 1.2

1931

Features and technical reference

555-233-5061940 Issue 5 October 2002

If the algorithm cannot find an available facility within the trunk group that meets

these constraints, then the call is blocked from using this trunk group. In this case,

the call may be routed to a different trunk group preference via Generalized Route

Selection (GRS), at which time, based on the wideband options administered on

that trunk group, the call would be subject to another hunt algorithm (that is, either

the same H11 algorithm or perhaps an N x DS0 algorithm described in a later

paragraph).

This same hunt algorithm, when offered any other call (other than a 1,920-kbps

call) attempts to preserve idle facilities by selecting trunk(s) in a partially

contaminated facility if one exists. If the bandwidth required by this call cannot be

satisfied by any partially contaminated facility, then the call is placed on available

trunk(s) within an idle facility, thus contaminating the facility. Again, facilities are

selected via the trunk group’s facility list and with PN preference, and trunk(s)

within a facility are selected based on the direction of channel search

administered. Note that on a T1 facility, a D-channel is not considered a busy

trunk and results in a facility with a D-channel always being partially

contaminated. On an E1 facility, however, a D-channel is not considered a busy

trunk because H11 and H12 calls may still be placed on that facility; an E1 facility

with a D-channel and idle B-channels is considered an idle facility.

H12

Since H12 is 1,920 Kbps which is comprised of 30 B-channels, a 1,920-kbps call

can only be carried on an E1 facility. As with H11, the hunt algorithm uses a fixed

allocation scheme with channel 1 being the fixed starting point. Hence, an H12

call always is carried on B-channels 1 to 15 and 17 to 31 on an E1 facility (as

illustrated in the following table). When offered any other call (other than a

1,536-kbps call), the algorithm behaves as it does when H11 is optioned.

DS0s Comprising Each Channel

Facility

ISDN

Interface H11 H12

23B + D

24B (NFAS)

1-24

30B + D

31B (NFAS)

1-15, 17-25

1-15, 17-31