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ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2
7-81
Field 3
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
Voice and Voice-grade data
1
Mode 1 data (56K-bps)
2
Mode 2 data (subrate up to 19.2K-bps)
3
Mode 3 data (also called packet mode)
4
Mode 0 data (64K-bps digital data)
This field shows the ISDN-PRI routing option. Field encodes and their descriptions
are:
Field 4
0
1
2
Any type of trunking facility is OK. The 0 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.
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).
NOTE: Mode 0 data, depending on its origin, may require a restricted
channel. Recall that an unrestricted channel is only provided by those
ISDN-PRI facilities that use the B8ZS line-coding format.
Any trunking facility will work but 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 7-39, Procedure 100 Word 1: Trunk Group Type Signaling and Dial access (ID)
Code, depicts this procedure.