Aastra Ascotel IntelliGate 2025 - Page 215

Ascotel IntelliGate 2025/2045/2065
Part 2 Routing elements 215
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 follow-
ing configuration stages:
1. Enter the network interface of the basic or primary rate access in the first
trunk group (e.g. "3.17").
2. Set the trunk group protocol (e.g. "DSS1").
3. Divide the B channels of the basic or primary rate access into B-channel
groups. The network interface already entered is changed to B channel group
1 (entry changes to 3.17/1).
4. Enter the other B-channel groups in the required trunk groups. The protocol
of the first trunk group is set automatically.
Subscriber Line Group (SLG) in ISDN
Digital outside lines that are to have the same traffic characteristics can be
grouped into subscriber line groups (SLG) in the public network (e.g. several basic
accesses with the same DDI block).
An SLG must also be recreated in the PBX. For this the network connections of
the exchange lines of an SLG must be allocated to the same trunk group (see Fig.
2.30).
A subscriber line group can consist of basic accesses, primary rate accesses or indi-
vidual B-channel groups of primary rate accesses (also mixed).
Fig. 2.30: Recreating an SLG in the PBX
PBX
Trunk
group 1
SLG
Trunk
group 2
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