Mitel 430 - Page 109

Routing elements
109
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
B Channel Groups
The two user-information channels of a basic access and the 30 user information chan-
nels of a primary rate access can be divided into 2 or 4 B channel groups.
1)
This clas-
sification is carried out only if, for example, not all the B channels of the primary rate
access are available. The B channel groups can be separately assigned to a trunk
group.
Open the corresponding network interface for configuration in the call routing ( =df).
Default: All B channels are in B-channel group 1.
Planning tips:
• B channels can only be grouped in sequence (e.g. channel group1 contains B chan-
nels 1 to 6).
• A B channel can only be allocated to one channel group.
• If the B-channel groups of a primary rate access are spread among different trunk
groups, the same protocol must be set for all trunk groups.
Configuration:
Once a trunk group contains a B-channel group, the trunk group’s protocol can no
longer be changed. For this reason it is important to proceed using the following config-
uration stages:
1. Enter the network interface of the basic or primary rate access in the first trunk
group.
2. Set the trunk group protocol.
3. Divide the B channels of the basic or primary rate access into B-channel groups.
The network interface entered already is changed to B channel group 1.
4. Enter the other B-channel groups in the required trunk groups. The protocol of the
first trunk group is set automatically.
Line group in the ISDN
Digital outside lines that are to have the same traffic characteristics can be grouped
into line groups in the public network (e.g. several basic accesses with the same DDI
block).
A line group must also be recreated in the communication server. For this the network
interfaces of the exchange lines of a line group must be allocated to the same trunk
group (see Fig. 51
).
A line group can consist of basic accesses, primary rate accesses or individual B-chan-
nel groups of primary rate accesses (also mixed).
1) Dividing up B channel groups is not supported by all network providers.