Installation 2-15
2.12 Polarity Sensitive Telephone Connection
123
456
789
0
Exchange Line
Reverse here
Extension
If your telephone is polarity sensitive, follow the procedure below:
1. Complete all the required extension wiring.
2. Confirm that dialling can be done from all the
extensions using a touch-tone telephone.
If dialling fails, the polarity between the extension
and the system must be reversed.
3. Reverse as shown.
4. Unplug the system.
5. Connect all exchange lines.
6. Confirm that dialling can be done on the following
extension using a touch-tone telephone.
Extension (A, B) of port 01: Exchange line 1
If dialling fails, the polarity between the system and
the exchange line must be reversed.
7. Reverse as shown.
8. Every time an extension telephone is replaced,
repeat the procedure above.
123
456
789
0
Exchange Line
Reverse here
Extension
PSQX1708ZA-03E.QX 99.10.15 5:46 PM Page 15