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156
Point-to-Point Connection Lines
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
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.
PBX 1
L1 master
L2 master
L3 master
Direct connection
Use the RJ45 jacks on one of the external S
nection between two Forum 523/524s. You can use the corre-
sponding pressure terminals for S
PBX 1, S
0
1 2 3 4 5 6 7 8
8 7 6 5 4 3 2 1
PBX 2, S
0
(RJ-45 socket)
Wiring of a direct connection
Note: If you use an S
nal) and an S
make sure you make the necessary changes to the port assign-
ment (see S
The external S
connection.
PBX Networking
ext
ext
0
port with an RJ45 jack for the direct connection,
0
Ports starting on page 48).
0
-ports of a gateway can also be used for a direct
0
PBX 2
L1 slave
L2 slave
L3 slave
ports on interface cards.
0
port on an interface card (pressure termi-
ports for an S
0
0
0
con-
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