Service manual AlphaCom PSTN2IP ML transceiver Rev. 1.6 10-09-2011 Page 11/65
Figure 3:
Schematics PSTN tamper loop
Jumper J19 is easy to find using the picture below:
Figure 4:
Jumper for PSTN tamper loop
To enable the PSTN tamper loop option jumper J19 must be placed over pin 1 and pin 2. This can be done
by moving the jumper of J19, which is situated directly next to the priority relay. The most upper pin (pin 3)
on J19 must be left open.
Also the PSTN tamper loop option must be enabled in the software. See programming PSTN interface.
The backup telephone line output (TEL) can be used to connect an external PSTN line or external GSM
interface. This connection can be used for backup purposes, in case the IP connection with the monitoring
station fails.
J19 is to select the PSTN tamper loop option.
Pin 3 of the schematics (0V) is the top pin of
the 3.
