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ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85
7-23
Field 3
This field is used to populate the BC code IE. All endpoints (such as analog lines
and DCP voice terminals) must show their information transfer requirements in
terms of a BC code. The BC code is the mechanism by which specialized routing is
provided for various categories of calls.
NOTE: Once the BC code is assigned, it is fixed and does not change with
different calls.
Field encodes and their descriptions are:
0
1
2
3
Voice and Voice-grade data
Mode 1 data (56K-bps)
Mode 2 data (subrate up to 19.2K-bps)
Mode 3 data (also called packet mode)
Field 4
4
Mode 0 data (64K-bps digital data).
This field is used to populate part of the TCM IE and shows an ISDN-PRI Routing
option. Field encodes and their descriptions are:
0
1
2
For when any type of trunking facility is OK. This option should be used when
there are no specific requirements for ISDN-PRI trunks. Generally, this will
include all voice and voice-grade data applications (BC code = 0) except those
where user-to-user information transfer is desired.
When ISDN-PRI trunking facilities are required. Generally, these applications
include those COS groups established for Mode 1 data (BC code = 1), Mode 3
data (BC code = 3), and Mode 0 data (BC code = 4).
Mode 0 data, depending on its origin, may require a restricted channel. Recall
that a restricted channel is only provided by those ISDN-PRI facilities that use
the B8ZS line-coding format.
When any trunking facility will work but when ISDN-PRI trunk facilities are
preferred. This may include voice and voice-grade data (BC code = 0) and
Mode 2 data (BC code = 2).
Procedure 100 Word 1: Trunk Group Type, Signaling, and Dial Access (ID) Code
Translating word 1 is the first step in establishing trunk groups. Those trunk groups established for
ISDN applications may be of the same design as those for non-ISDN applications, except for the type
of signaling used. Or, they may (optionally) be designed to take maximum advantage of the ISDN
capabilities. Figure 7-10, Procedure 100 Word 1: Trunk Group Translations (System 85 R2V4), shows
procedure 100, word 1.