DETEWE opencom 105 - Types of Point-To-Point; Connection

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PBX Networking PBX Networking
L1 sync possible has been activated,
then one of the ports is automati-
cally 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 circu-
lar application of the L1 clock is not
allowed.
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 tempo-
rarily.
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 ad-
ditional trunk lines to one of the
PBXs.
Types of Point-to-Point
Connection
There are different types of connec-
tion available for an ISDN point-to-
point connection between two PBXs,
depending on the distance between
them.
Direct Connection
This type of point-to-point connec-
tion 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, 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
con-
nection between two
OpenCom 100s.
■ Use the pressure terminal of the
S
2M
port for an S
2M
connection
between two OpenCom 120 sys-
tems.
Wiring of 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)
PBX 1, S
2M
PBX 2, S
2M
(Pressure clamps)
Rx+ Rx- Tx+ Tx-
Rx+ Rx- Tx+ Tx-