Mitel Aastra 470 System Manual page 147

Tab. 70 Cable requirements for FXS mode: 2-wire door
Core pairs  cores
Stranded
Wire diameter, core
FXS resistance
Line length 0.6 mm diameter
Screening
FXS mode: External audio source
One FXS interface per communication server can be configured for connecting an
audio device. In this mode the FXS interface becomes an audio input that can be
used for the following purposes:
• to play music or an announcement to connections with callers on hold ("Music
on hold" function).
• to play music or an announcement for the announcement service (announce-
ment prior to answering), voice mail greetings or for "Music on hold" and then to
store it as a wave file.
FXS interface
Fig. 59 Connection for FXS mode: External audio source
Any playback equipment (tape recorder, CD player, etc.) with a line output can be
used as the audio source. It is advisable to merge the left/right audio signal via 2 re-
sistors (see Fig. 59).
Warning
The default value of all FXS interfaces is configured to Phone/Fax. Audio
equipment may be damaged by the DC or AC voltage imposed.
Make sure that the mode of the FXS interface is configured to External
audio source before connecting audio equipment.
Aastra 470 as of R3.2
syd-0337/1.6 – R3.2 – 09.2014
1  2
only with lengths > 200 m
0.4 ... 0.8 mm
max. 2  200 
max. 3 km
not required
1k
a L
R
1k
b Gnd
line out
Installation
147