Connection Via An Active Transmission System; Connection Via The Public Network - Aastra OpenCom 100 Mounting And Commissioning User Manual

PBX Networking
PBX 1, S ext
0
1 2 3 4 5 6 7 8
8 7 6 5 4 3 2 1
PBX 2, S ext
0
(RJ-45 socket)
Wiring of a direct connection

12.2.2 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.
PBX 1
Transmission
L1 slave
System
L2 master
L3 master
L1 master
Connection by an active transmission system

12.2.3 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.
OpenCom 130: PBX 1, S
2M
Rx+ Rx- Tx+ Tx-
Rx+ Rx- Tx+ Tx-
PBX 2, S
2M
(Pressure clamps)
Note: If you use an S
terminal) and an S
nection, make sure you make the necessary changes to the
port assignment (see S0 Ports on Interface Cards starting on
page 49).
PBX 2
L1 slave
L2 slave
L3 slave
Note: The active transmission system itself gets its L1 clock
either from the network operator or from a clock generator
connected by wire.
Types of Point-to-Point Connections
OpenCom 150: PBX 1, S
2M
Rx+ Rx- Tx+ Tx-
Rx+ Rx- Tx+ Tx-
PBX 2, S
2M
(Pressure clamps)
port on an interface card (pressure
0
port with an RJ45 jack for the direct con-
0
157