PSTN Line Connection Options
Dualcom’s line connection requires an analogue telephone line. For con-
nection to other types of telephone line, refer to the previous pages.
Connecting other telecoms equipment IN PARALLEL to the analogue
telephone line used by Dualcom (or any Digital Communicator) can stop
the unit sending alarm calls to an Alarm Receiving Centre. Parallel
connection is NOT recommended for Dualcom when it is used in a secu-
rity system.
There are several ways that a Dualcom may be connected to a PSTN telephone
line particularly when other equipment needs to share the same telephone line.
Some require that your Telecom Service Provider supplies particular line fea-
tures. Some require NVM programming options. Refer also to the ‘Safety Earth’
and the ‘Call Minder’ sections.
The highest security PSTN line for Dualcom (Recommended):
A PSTN line supplied as ‘outgoing calls only’, i.e. Incoming Ringing Barred,
AND the PSTN line is ex-directory,
AND the PSTN line goes to the Dualcom ONLY. Other equipment can be
connected to the Dualcom A1 & B1 terminals (i.e. series connection) to make
outgoing calls only. See next page.
The next best security option for a PSTN line (Recommended):
A PSTN line supplied with the ‘3-way calling’ feature,
AND the Dualcom NVM is programmed for ‘3-way calling’,
AND the PSTN line goes to the Dualcom ONLY. Other equipment can be
connected to the Dualcom A1 & B1 terminals (i.e. series connection) for in-
coming and outgoing calls. See page 21.
The ‘no security’ option ( !!! NOT Recommended !!! ):
A PSTN line supplied without ‘outgoing calls only’ or the ‘3-way calling’ feature.
This option can not cancel or ‘hold’ incoming calls and these will inhibit Dualcom
from making a telephone call to the Alarm Receiving Centre.
The ‘parallel connection’ option ( !!! NOT Recommended !!! ):
The Dualcom A & B terminals connect to the telephone line,
AND other equipment connects directly to the same telephone line.
This connection option can not cancel or ‘hold’ incoming or outgoing calls and
these will inhibit Dualcom from making a telephone call to the Alarm
Receiving Centre.
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