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C
ABLING INTERFACES
CHAPTER 4 INSTALLATION
Figure 4.44: Connection for FXS mode: 2-wire door
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 (announcement prior to
answering), voice mail greetings or for "Music on hold" and then to store it as a wave file.
Figure 4.45: 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 resistors (see Connection for FXS mode:
External audio source).
CAUTION: The default value of all FXS interfaces is set 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.
Table 4.30:Cable requirements for FXS mode: 2-wire door
Core pairs x cores 1 x 2
Stranded only with lengths > 200 m
Wire diameter, core 0.4 … 0.8 mm
FXS resistance max. 2 ´ 200 W
Line length 0.6 mm diameter max. 3 km
Screening not required
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