Features - Alphatech (en)

• Voice communication is powered from telephone line only
  

• Tone (DTMF) and pulse dial
  

• Two 24digit numbers with each button (including *, #, Flash and Pause)
  

• DAY/NIGHT switching by DTMF code or automatically by integrated real time clocks - RTC, weekly schedule (C model)
  

• Possibility of the call extension by * or # choice    
  

• Possibility to connect 1 or 2 (only C) independent locks for door opening
  

• 8 different relays modes (for example: additional ring, progressive opening)
  

• Two codes for hanging up the unit by telephone
  

• Two codes for door opening by telephone for 1 pulse and two codes for 2 pulses
  

• 3 x 6 codes for each relay (code by buttons at doors)
  

• Possible switched on hang up by press the same push button
  

• Possible switched on mode "Baby Call"
  

• Possible switched on suppress receive DTMF by microphone
  

• Possible switched on accoustic tick to the conversation for speech recognition
  

• Possible switched on accoustic signalization of close the relay
  

• Adjustable number of rings before pick up an incoming call
  

• Adjustable parameters of tone dial, length of Flash and Pause
  

• Adjustable parametres of acoustical signalization
  

• Adjustable parametres of tones detector
  

• Elektronical loudness settings ( without neccessity open the unit)
  

• Integrated analog colour camera with permanent or automatical operation  /C
  

• Automatical camera lighting infra LED  /C
  

• Possibility of powering by external PSU 12V (Siemens)/C
  

• Easy settings of HW by DIP switch  
  

• Factory settings (default) in different levels
  

• Programming by phone DTMF or by USB cable from
  

• Integrated heating for PCB
  

• Permanent cards lighting, switchable
  

• Ground output for better protection against static electricity
  

(C) – comfort model only (Comfort)
/C  - model with camera only

Acoustic path setting
The principle of setting acoustic paths:  
There are three parameters 71, 72 and 73. Interaction of these parameters influences the audio performance in various  environment conditions.  

• in a quiet environment, the parameters 71,72,73 are set to value 7  
  

• in an environment where there is a strong ambient noise at the communicator and quiet environment at the phone, it is necessary to reduce  the microphone ´s gain (for example the parameter 72 = 1-3) and also change the ratio of the parameters 71/73  in a way that value 73 increases (for example the parameter 73 = 11-15) and the value of 71 parameter descreases (71 = 2-4)
  

• in an environment where there is a strong ambient noise at the phone and a quiet environment at the communicator. In this case we keep the value of parameter 72 = 7 and 73 and 71 parameters should be  set as follows, for example:   parameter 71 = 11-14 and 73 = 2-4
  

The principle of setting of the parameters is the following:
the  signal from the microphone is amplified by the sum of parameters  72+71 = volume of microphone  and the signal to the speaker is amplified by the sum of parameters  71+73 = volume of speaker. Switching the direction of the ratio is evaluated by parameters 73/72 ratio (threshold).  

• If the value of the parameter 72 is greater than the value of the parameter 73, then we are favoring the direction from the microphone. This is for cases when the audio direction to the phone is being interrupted.  
  

• If the parameter 73 is greater than  the parameter 72, then we are favoring the direction to the speaker. This is for cases when there is an interrupted sound in the speaker of the door phone communicator.