Routing elements
108
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
5. 2. 1 Trunk Groups of Network Interfaces
General Rules and Settings
A network interface can only be assigned to a single trunk group.
A trunk group contains either analogue or digital network interfaces.
The digital network interfaces of a trunk group lead either
• to the permanently networked PISN if Network type = Private is set,
• to the public network if Network type = Public is set.
The following rules apply to the setting of the transmission protocol ( Protocol) for the
network interfaces of a trunk group:
• Trunk groups with Network type = Private are usually set to the PSS1 (QSIG)
protocol.
• Trunk groups with Network type = Public are set to protocol DSS1.
Tip:
It is advisable to enter network interfaces that have the same destination in the same trunk
group, for example to set up one trunk group for the public network, one trunk group for
PINX 1 and one trunk group for PINX 2, etc.
Default settings
Newly set up digital network interfaces are automatically entered in trunk group 1.
Trunk group 1 is set to Network type = Public and Protocol = DSS1.
Newly set up analogue network interfaces are automatically entered in trunk group 2.
Seizure Sequence for Outgoing Calls
Within a bundle the system will first try and seize the network interface that was en-
tered last (large numbers). If for whatever reason this interface is not available, it will
then attempt to seize the second last interface, then the third last, etc. (see also
Fig. 53
).
This is repeated for each outgoing call using the same principle. This means the call
charges tend to accumulate on the network interface entered last.
BRI-S Interface as the Network Interface
An BRI-S interface set as BRI-S external is also classified as a network interface
and can be assigned to a trunk group.
Note:
If an BRI-S interface is reconfigured within a trunk group to ETSI, it is no longer a network
interface and is removed from the trunk group.
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