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Specifications Passport 4400 Hardware Installation Manual
C-7
FXS Signaling Specifications
:
Signaling Formats
AC:
DC:
DTMF
Pulsed
DTMF Distortion: <1.5% (transparently passed
Pulse Distortion: <3%
Battery current into 130
ohm load:
>36 milliamperes
Battery current into 900
ohm total loop:
20 milliamperes minimum
Ringing Tone (Software
Selectable):
25 Hz (default), or 50 Hz + 2 Hz
Ringing Voltage, with Ac
Load of 2 Ringers (4000
ohms and zero line 25 Hz
Tone:
>54 VRMS
20 and 50 Hz Tones: >50 VRMS
Ringing Current: >16 milliamperes into 5000 ohm load
Ring Cadence
Repeated Ring:
Interrupted Ring:
Matches ringing cadence from remote voice/fax
channel
On for 2 seconds, off for 4 seconds.
Ringing Cadence Repeat
Distortion:
<2%