User guide

Point-to-Point Connection Lines156
PBX Networking
Point-to-Point Connection
Lines
There are different types of lines available for an point-to-point
connection between two PBXs, depending on the distance
between them.
Direct Connection
This type of ISDN point-to-point connection joins the two systems
directly to each other using a crossover twisted-pair cable. An S
0
connection can be used for distances up to 1,000 metres. Nor-
mally one PBX is the protocol master for all three layers, and the
other PBX is the protocol slave for all three layers.
Direct connection
Use the RJ45 jacks on one of the external S
0
ports for an S
0
con-
nection between two Forum 523/524s. You can use the corre-
sponding pressure terminals for S
0
ports on interface cards.
Wiring of a direct connection
Note: If you use an S
0
port on an interface card (pressure termi-
nal) and an S
0
port with an RJ45 jack for the direct connection,
make sure you make the necessary changes to the port assign-
ment (see S
0
Ports starting on page 48).
The external S
0
-ports of a gateway can also be used for a direct
connection.
PBX 1
L1 master
L2 master
L3 master
PBX 2
L1 slave
L2 slave
L3 slave
12345678
87654321
PBX 1, S
0
ext
PBX 2, S
0
ext
(RJ-45 socket)