66251750-EN - V1.0 - 05/06/17
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4000 Series Vandal Resistant Digital GSM - Technical Manual
4000 Series Vandal Resistant Digital GSM Audio Intercom with Proximity
Additional User Information
UNDERSTANDING THE SIGNAL STRENGTH (SIG)
When a request for signal strength message is sent to the digital GSM intercom 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 digital GSM:
SIGNAL
=
31
BER
=
0
OK
VIDEX
GSM
DIALLING INTO THE DIGITAL GSM FROM ANOTHER TELEPHONE
There are three possible outcomes to dialling into the digital 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 priority function table below
and are shown in order of priority. For example, if the number is programmed to automatically activate the relay (
DTO
), 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.
Priority Function Table
FUNCTION
REQUIREMENT
PRIORITY
Dial in to open the Door (DTO).
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 as a primary number or one of
the divert numbers:
STNn
STDn
STEn
STFn
where n = apartment no. (500 max.) The
DTO
feature
must
also be enabled (switched ON), refer
to page 37 for
DTO
set up.
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 as a primary number or one of
the divert numbers:
STNn
STDn
STEn
STFn
where n = apartment no. (500 max.) The
DTO
feature
must
also be disabled (switched OFF), refer
to page 37 for
DTO
set up.
2nd
Dial in to open the speech from a telephone number
not stored in the digital GSM.
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
UNDERSTANDING THE BEEPS
Functions and errors are indicated by beeps from the digital GSM panel. The following will help you understand the different beeps
heard and what, if anything, needs to be done in response to the beeps.
BEEP
REASON
SOLUTION
Short beeps at 1 second
intervals.
Relay or auxiliary output activated.
None, this is normal.
Single short beep while
the system is in standby
and not being used.
A valid text message has been received and
processed.
None, this is normal.
