PBX Networking Types of Point-to-Point Connections
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■ Use the RJ45 jacks on one of the external S
0
ports for an S
0
connection
between two OpenCom 510s.
Wiring of a direct connection
13.2.2 Connection via an Active Transmission System
For distances exceeding the range of a direct connection, an active transmission
system can increase the range to up to 50 km. Normally the L1 master is the trans-
mission 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 system itself gets its L1 clock
either from the network operator or from a clock generator
connected by wire.
13.2.3 Connection via the Public Network
Point-to-point connections via the public network of a network operator can be
used for bridging distances beyond 50 km. Due to the long distance involved, for
technical reasons it is not possible to synchronise 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.
12345678
87654321
PBX 1, S
0
ext
PBX 2, S
0
ext
(RJ-45 socket)
PBX 1
L1 slave
L2 master
L3 master
PBX 2
L1 slave
L2 slave
L3 slave
Transmission
System
L1 master
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