Point-to-Point Connection Lines
136
PBX Networking
When applying the L1 clock of trunk lines, you can assume that the public
network is “clock-aligned”. So, in the above example, you can connect addi-
tional trunk lines to one of the PBXs.
Point-to-Point Connection Lines
There are different types of lines available for a 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. Normally 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
connection
between two Forum 523/524s. You can use the corresponding 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 terminal)
and an S
0
port with an RJ45 jack for the direct connection,
make sure you make the necessary changes to the port
assignment (see
PBX 1
L1 master
L2 master
L3 master
PBX 2
L1 slave
L2 slave
L3 slave
1 2 3 4 5 6 7 8
8 7 6 5 4 3 2 1
PBX 1, S
0
ext
PBX 2, S
0
ext
(RJ-45 socket)
Summary of Contents for forum 523
Page 1: ...Forum 523 524 Mounting and Commissioning Manual ...
Page 10: ...8 ...
