PBX Networking
Types of Point-to-Point Connections
130
If more than one port with the setting
L1 Type
= “Slave” is configured on an
OpenCom 100 and the setting
L1 sync possible
has been activated, then one of
the ports is automatically defined as the L1 clock source. The OpenCom 100 will
automatically switch the clock source to another port configured as an L1 clock
source (if a line fails, for example).
Please note:
Reciprocal or circular application of the L1 clock is not allo-
wed.
Example: In the above case you could reverse the L1 slave/master setting for the
connection between PBX 1 and PBX 3. However, if you then activate the setting
L1 sync possible
for the port of PBX 1, this may cause parts of the PBX network to
stop functioning temporarily.
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 additional trunk lines
to one of the PBXs.
12.2
Types of Point-to-Point Connections
There are different types of connection available for an point-to-point connection
between two PBXs, depending on the distance between them.
12.2.1 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 dis-
tances up to 1,000 metres, while an S
2M
connection can span up to 250 meters.
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 OpenCom 100s. You can use the corresponding pressure ter-
minals for S
0
ports on interface cards.
PBX 1
L1 master
L2 master
L3 master
PBX 2
L1 slave
L2 slave
L3 slave
Summary of Contents for OpenCom 130
Page 1: ...130 OpenCom100 131 150 Mounting and Commissioning User Guide ...
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Page 202: ...Index 200 Notes ...
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