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National Communications
DESCRIPTION
Our
Telephone Line Monitor (TLM)
device is designed to activate whenever
the Telephone Line that it is connected to has been disconnected or cut.
The incoming Telephone Line MUST connect to the LINE IN port of
TLM
.
All telephones and telephone devices MUST connect to the LINE OUT port of
TLM
.
This is extremely important because Telephone Devices connected in Parallel
to the same Telephone Line as
TLM
will activate the
TLM
Relay whenever they
are used.
TLM
is totally ‘Transparent’ in operation and will not affect the use of the
Telephone Line in any way.
TELEPHONE LINE DISCONNECTION
TLM’s
function is to constantly monitor the Telephone Line that it is connected
to and only respond when the telephone line connected to it has been
disconnected or cut.
In the event that this happens, after 6 seconds
TLM
will automatically CLOSE
the contacts of an Internal Relay, which in turn can be used to trigger other
external equipment to advise of the loss of Telephone Line. The contact of the
Internal Relay will remain closed until the telephone line service has been
restored.
TLM’s
Internally Relay has Dry Relay Contacts, rated at 12V/1A.
Three Optional low cost Accessories are available from Natcomm for use with
TLM
, to alert the user
that the Telephone Line has been lost. These Accessory
Devices are all designed for Easy User Installation. See page 5 for further details.
The Relay Output of
TLM
can alternatively be used to Control a 3rd Party
Electrical Device (not supplied). An Accessory Device Connection box (with 2
screw terminals) is supplied for this purpose and connects to
TLM
via a short
supplied cable.
Important Note : TLM
waits 6 seconds before activating the internal relay,
should it detect that a telephone line connected to it has been disconnected or
cut This period is designed to overcome false alarms should a very brief
interruption to the telephone line service occur.
