System Functions and Features as of I7.9
76 Routing elements
syd-0200/3.0 – I7.9 – 11.2009
S Interface as the Network Interface
An S interface set as external is also classified as a network interface and can be as-
signed to a trunk group.
Note:
If an S interface is reconfigured within a trunk group (to ETSI or V2), it is no
longer a network interface and is removed from the trunk group.
B Channel Groups
The two user-information channels of a basic access and the 30 user information
channels of a primary rate access can be divided into 2 and 4 B channel groups (B
channel list setting
1)
). This classification is carried out only if, for example, not all the
B channels of the primary rate access are available. B channel groups can be sepa-
rately allocated to a trunk group, for example the primary rate access on network
interface 3.17 can be entered as follows:
• "3.17": All four B-channel groups are allocated to the trunk group.
• "3.17/2": Only B-channel group 2 is allocated to the trunk group.
Initialization value: All B channels are in B-channel group 1.
Planning tips:
• B channels can only be grouped in sequence (e.g. channel group 1 contains B
channels 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.
1)
Dividing up B channel groups is not supported by all network providers.
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