Mitel Aastra 470 System Manual page 148

Installation
Note:
The customer is responsible for all copyright matters relating to any
music playback.
Tab. 71 Technical data for FXS mode: External audio source
Input impedance
Input level
Input circuit
Output resistance audio source
Installation cable
FXS mode: Control output
If an FXS interface is configured as a control output, the signal can be used to con-
trol external devices or equipment (e.g. heating, alarm or outdoor lighting sys-
tems).
The no-load voltage is 24 VDC; the current is limited to 25 mA. A connected relay
must be of the type 24 VDC and must not draw more than 300 mW in power.
There are no special requirements for the cables.
Warning
Control outputs must have a floating connection.
24 VDC
Fig. 60 Connection for FXS mode: Control output
148
a
max. 25mA
b
FXS interface
approx. 15 k
configurable
asymmetrical
< 1 k
NF cable screened (required for low levels)
Aastra 470 as of R3.2
syd-0337/1.6 – R3.2 – 09.2014