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Safe Communications Ltd
March 2003
TECHNICAL CHARACTERISTICS
•
Ringing call voltage
> 35 V RMS 25Hz or 50Hz
•
Current in the telephone (off-hook position)
35mA (20mA minimum)
•
Voltage at terminals (on-hook position)
48V (24V minimum)
•
Dialling system
DTMF or Pulse
•
Dialling tone
Continuous tone
Frequency: 270 to 540Hz
Detection time 2 sec.minimum
•
Busy tone
Frequency: 300 to 500 Hz
Beep/pause sequence for more than 10 seconds. Detection time 4-10 sec.
Beep: 100 to 600 ms
Pause: 100 to 600 ms
•
Distance ringing tone
Frequency: 350 à 500Hz
Beep/pause sequence until far-end off-hook
Beep: 0.2sec. to 1.6 sec.
Beep + pause sequence < 6 sec.
•
End of conversation sequenced tone
Frequency: 300 to 500 Hz
Beep/pause sequence for more than 10 seconds. Detection time 4-10 sec
Beep: 100 to 600 ms
•
End of conversation continuous tone
Frequency: 300 to 500 Hz or 760 to 840 Hz
Tone sequence for more than 10 seconds
Detection time 6-10 sec.
•
Call voltage transmitted by the switch
Frequency : 50Hz or 25Hz
Ringing duration : 1.5s
±
0.5s
Pause duration : 3s
±
2s
