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TECHNICAL BULLETIN

SD1/001/93

SD1 CALL ACKNOWLEDGEMENT

Most of the queries we receive for the SD1 Speech Dialer relate to the acknowledgment

procedure This Technical Bulletin should clarify all aspects of the function, both for the end-

user and the installer.

At the end of its message the SD1 sends an audible “beep” which must be answered within 2

seconds using the tone generated by pressing the [8] button on a standard telephone. On

hearing the [8] tone the SD1 immediately sends a second “beep” which must also be

answered in the same way. If successful a multi-tone confirmation signal is heard , if not then

the message is repeated with the acknowledgment “beeps” again at the end.

POINTS TO NOTE:

1. The SD1 will not acknowledge signals from Pulse Dialing telephones or those with

short tones. Check all recipients phones by calling them and getting them to press

the [8] button . If a series of clicks is heard (or the tone cannot be sustained by

holding down the button) then a Tone Dial Simulator will be needed to acknowledge

the SD1 messages (see below for details).

2. No harm is done by not acknowledging the message as the unit simply repeats the

message 5 times and then aborts the call.

3. The procedure is fairly fast and should be practiced by all the recipients under test

conditions. The [8] button must be pressed within 2 seconds each “beep” and should

be held down for between ½ to 1 ½ seconds. If either tone is not “seen “ by the SD1

the message is repeated again.

TONE DIAL SIMULATORS

For the acknowledgment procedure the SD1 “looks” for any tone between 600Hz and 1400Hz.

This is supplied most reliably by the [8] button used for DTMF dialing although other buttons

may work if pressed accidentally. I the recipients phone cannot produce a suitable tone then a

Tone Dial Simulator musty be used. These are available from many high street electrical

stores and also from specialist suppliers such as RS (stock code 252-841) and Maplins (stock

code CK252C).

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Menvier Security TSD401 Manuale Utente Pagina 2