I n s t a l l a t i o n & P r o g r a m m i n g M a n u a l
68
Extension wiring
206/208 systems only:
To eliminate cross-talk, it is a requirement that twisted pair cable must be
used to support all extensions and system integral devices with only one terminal per cable. Four-
wire cable must be used. Individual cable-runs between the extension device and the MDF
Connection Terminals is a mandatory requirement (Star-Wiring technique).
Cable run lengths
Extension type
Cable run length
206/208 systems
Cable run length
212 system
Single Line Telephone Extensions (900
Ω
) (using 0.4mm² cable) 3285m
2000m
Executive / Standard Terminals / Door phone (Mains power
using 0.4mm² cable)
950 m
500m
Executive / Standard Terminals / Door phone (Battery Back-
up using 0.4mm² cable)
200 m
500m
If an ordinary telephone is connected to an extension which previously had a Terminal connected,
the system needs to be told that the Terminal is no longer connected. Ringing will not be heard at the
extension until this has been done, though dialling will still be possible. After plugging in the SLT, go
off-hook and enter the code *750 ext #.
Power Failure Transfer
In the event of a power fail the analogue exchange lines will be connected directly to the designated
power fail extensions as shown in the table below. The system Executive and Standard Terminal will
not function correctly in the event of a power fail and should not be connected to these extensions.
Exchange
Line
206
208
212
1
11 11 11
2
15 (requires 1+2 in expansion
slot 1)
12 12
3
17 (requires 1+2 in expansion
slot 2)
21 (Requires 1+2 or 2+2 in
expansion slot 1)
25 (Requires 2+2B in
expansion slot 1)
4 -
None
None
5
-
23 (Requires 1+2 or 2+2 in
expansion slot 2)
27 (Requires 2+2B in
expansion slot 2)
6 -
None
None
The power fail telephone must match the line signalling characteristics provided by the network
carrier. The optional Executive or Standard Terminal should not be connected to a power fail
extension as it will not function in power fail mode.
External wiring protection
The 206 system have overvoltage protection on extension 14, the 208 system have overvoltage
protection on extensions 14, 21 and 23 and 212 systems have overvoltage protection on the
extensions 11, 12, 14, 25 and 27 are suitable for outdoor cable runs. No other extensions are suitable
for external use without additional external lightning protection.
Connecting terminals to 206/208 systems
When installing the Executive or Standard Terminal the signalling pair are polarity dependent. The
speech pair is connected to the normal speech connections for the extension. The signalling pair is
connected to any of the signalling pairs shown in Figure 4-4, each of the pins are labelled also on the
casing under the MDF cover. When the speech wires are correctly wired then the terminal LED's
will flash and it will be possible to make a call. If the signalling wiring is reversed then the display will
show ‘Communication Error’ on the Executive Terminal screen and the Line 1 lamp will flash
repeatedly after a short delay and the LEDs will not function on the Standard Terminal. While there
is a communication error the terminal will beep every 2 seconds and the Line 1 key will flash until the
wiring problem is resolved.
After connecting the Executive Terminal or Standard Terminal with correct wiring the extension will
automatically configure itself and the display will show ‘This is extension: xx’ on the Executive
Important!
Important!
