Installation
151
Aastra 470 ab R3.0
syd-0337/1.5 – R3.0 – 05.2013
FXS mode: Two-wire door
In this mode two-wire door intercoms with DTMF control functions can be con-
nected. The no-load voltage in this mode is 24 VDC. The loop current is limited to
25 mA.
Fig. 57 Connection for FXS mode: Two-wire door
Tab. 68 Cable requirements for FXS mode: Two-wire door
Cores paires cores 1 2
Stranded only for lengths > 200 m
Wire diameter, core 0.4 … 0.8 mm
FXS resistance max. 2 200
Line length for a wire diameter of 0.6mm. max. 3 km
Screening not required
a
b
FXS interface
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