66250675-EN - V1.0 - 05/09/17
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4000 Series Vandal Resistant GSM - Technical Manual
4000 Series Vandal Resistant GSM Audio Intercom with Proximity Facility
Additional User Information
UNDERSTANDING THE SIGNAL STRENGTH SIG
When a request for signal strength message is sent to the GSM intercom panel it will reply with a 4 digit code. The code is broken
down into two parts, a signal strength code which will be between 0 – 31 or 99. Ideally the signal strength should be as close to 31 as
possible. The lower the number, the weaker the signal. Signal strengths lower than 10 may cause operational problems such as loss
of speech quality (and possibly missing DTMF tones) and network loss. A signal strength of 99 indicates it could not be detected.
The second part of the code is the BER (bit error rate). Ideally the BER code should be as close to 0 as possible, the lower the BER the
better. The example below shows the reply to expect from the GSM intercom:
SIGNAL = 31
BER = 0
OK VIDEX GSM
DIALLING INTO THE GSM INTERCOM FROM ANOTHER TELEPHONE
There are three possible outcomes to dialling into the GSM intercom depending on the telephone number you are dialling in from
and the features setup during programming. The three possible outcomes are shown in the table below and are shown in order of
priority. For example, if the number is programmed to automatically activate the relay, this will take priority over the following two
options and if the telephone number is stored as a telephone number called from one of the push buttons, this will take priority
over the last option.
FUNCTION REQUIREMENT PRIORITY
Dial in to open the Door.
After dialling the GSM number, the relay will activate
and the call will be dropped.
The telephone number of the telephone dialling
in must be stored in memory location (dial to open
list) STR000 - STR999.
1st
Dial in to activate a call (live speech, activate relay/
auxiliary AO).
After dialling the GSM number, the call will be
answered and two beeps will be heard. The speech will
then be live.
The telephone number of the telephone dialling
in must be stored in memory location:
STN001 - STN024
STD001 - STD024
STE001 - STE024
STF001 - STF024
2nd
Dial in to open the speech from a telephone number
not stored in the GSM intercom.
After dialling the GSM number, the call will be answered
and two beeps will be heard. You will then be required
to enter the 4 digit code to open the speech.
If neither of the two requirements above are met.
3rd
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