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42
Connection to the Exchange Line and PBX
ISDN PBX with more than one S
(Connection for synchronization)
In this operation mode the connection of a S
of the PBX to the analog connections of the net-
work provider is done the same way as described
in
chapter ISDN PBX with one S
Additionally you have to make a connection to the
ISDN connection (NT) connected to one of the
other external S
ports of the PBX for synchroniza-
0
tion.
The following connection types are possible –
even mixed:
–
in case of a small distance between the
devices: Direct connection with the cables
enclosed in the scope of delivery
–
in case of a long distance between the
devices: Fixed installation cables and wall-
mounted jacks if necessary
Use the following connection cables, partly
enclosed in the scope of delivery for direct con-
nections:
–
one ISDN connection cable RJ-45 (8P/4C) to
RJ-45 (8P/4C) for the connection to the NT
(also see point
–
one ISDN connection cable RJ-45 (8P/4C) to
RJ-45 (8P/4C) for the connection to the PBX
(also see point
For fixed wiring you need the following installa-
tion cables or wall-mounted jacks:
–
unscreened 4-core installation cable (e.g. J-
YY 2x2x0.6 St III Bd) for the connection to the
external S
port of the PBX and the NT (see
0
also point
and
–
if a direct connection is not possible, ISDN
wall-mount jacks (e.g. IAE or UAE) and ISDN
connection cable for the connection to the
external S
port of the PBX and the NT
0
Please pay attention to the following
advice when laying the ISDN conduc-
tors (S
bus):
0
- In case of unfavourable conditions (e.g. near a
powerful radio station or near a power line) use a
screened cable.
- Limit the length of the total bus to a maximum of
150 m.
- Put terminators at the beginning and at the end
of the connection (see also point
Fig. 9 on page
44).
Port
0
port on page
0
in
Fig. 8 on page
43)
in
Fig. 8 on page
43)
in
Fig. 9 on page
44)
and
- To compensate interference use a cable with a
star quad stranding that is wired as shown in
Fig. 6 on page
(a1 and b1) as well as both receiving wires (a2
port
0
and b2) are in opposite direction of each other.
- How to connect the UAE8 or IAE jack with the
Analog/ISDN Converter, is shown in
39.
page
42.
- If an external S
PBX to the NT is already available, you only
have to connect the Analog/ISDN Converter to
this bus with an ISDN connection cable.
important which connection type the NT has or if
other devices are connected to the NT.
Fig. 6: Star quad
red
black
Fig. 7: Clamps Pinout
in
42. Thereby both sending wires
bus for the connection of the
0
The Analog/ISDN Converter works as a
receiver of signals in this connection
but not as a sender. Due to this it is not
If the PBX is connected to more than
one NT, you still connect the synchroni-
zation with only one NT.
Devices without an own power sup-
ply cannot be operated in parallel to
the PBX.
white yellow
Fig. 7 on
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