79
PBX Networking
PBX Networking
Connection via an Active
Transmission System
For distances exceeding the range of
a direct connection, an active trans-
mission system can increase the
range to up to 50 km. Normally the
L1 master is the transmission system
for the two connected PBXs. For the
protocol layers L2 and L3, one PBX is
normally the protocol master and
the other PBX is the protocol slave.
Connection by an active transmission
system
Note:
The active transmission sys-
tem itself gets its L1 clock either from
the network operator or from a clock
generator connected by wire.
Connection via the Public
Network
Point-to-point connections via the
public network of a network opera-
tor can be used for bridging dis-
tances beyond 50 km. Due to the
long distance involved, for technical
reasons it is not possible to synchro-
nise the L2 protocol. Consequently,
the public network is normally the
protocol master for protocol layers
L1 and L2. One PBX is therefore the
L3 master and the other PBX the L3
slave.
Point-to-point connection via a pub-
lic network
Configuration
The possible configurations de-
scribed below can be set up in the
Web console using the
PBX Configu-
ration: Trunks
menu.
Trunk groups
This is a group of lines of the same
type and direction. A line can only be
assigned to one
trunk group
.
Example of a PBX network with trunk
groups
In the above example, the following
trunk groups are configured for
PBX 1:
■
Two S
0
lines in a multi-terminal
configuration to the network
operator which are assigned to
the “A” trunk group.
■
Two S
0
point-to-point connec-
tions to PBX 2 which are as-
signed to the “C” trunk group.
PBX 1
L1 slave
L2 master
L3 master
PBX 2
L1 slave
L2 slave
L3 slave
Transmission
System
L1 master
PBX 1
L1 slave
L2 slave
L3 master
PBX 2
L1 slave
L2 slave
L3 slave
Public
network
L1 master
L2 master
A
B
C
E
D
Bundle
PBX 1
PBX 2
PBX 3
Network
operator
Trunk line
Point-to-point
connection
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