DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506 Issue 1
April 2000
Screen reference
982Trunk Group
17
ISDN calls. DEFINITY ECS compares the entry in the BCC field to the value of
the Bearer Capability information element for the incoming call and routes the
call over appropriate facilities. For example, a call with BCC 4 will only be
connected through facilities that support 64 kbps data transmission.
The Bearer Capability Class field appears when all of the following are true:
■Either the ISDN-BRI Trunks field or the ISDN-PRI field on the System
Parameters Customer-Options screen is y.
■The Group Type field is access, co, fx, tandem, tie, or wats.
■The Comm Type field is data, avd, or rbavd.
ITC
The Generalized Route Selection feature, part of the automatic routing technology
used in DEFINITY ECS, compares the line c oding of available digital facilities
and selects appropriate routes for voice and data calls. The Information Transfer
Capability field appears when the Comm Type field is data, avd, or rbavd and the
BCC field is not 0.
Tip:
To find out what kind of line coding a trunk group member uses, check the
Line Coding field on the DS1 Circuit Pack screen for the DS1 port to which
the member is assigned.
Valid entries Usage
0For voice and voice-grade data
1For 56 kbps synchronous data transmitted with robbed-bit
signaling
2Less than 19.2 kbps synchronous or asynchronous data
3For 64 kbps data and LAPD protocol
4For 64 kbps data on unrestricted channels
Valid entries Usage
rest(ricted) Restricted trunks use ami-basic or ami-zcs line coding and
can carry only restricted calls.
unre(stricted) Unr estricted tr unks use b8zs, hdb3, or cmi line coding and can
carry restricted or unrestricted calls. A trunk group with an
unrestricted ITC may have only unrestricted trunks as
members.