Aastra 470 - Page 150

Installation
150
Aastra 470 ab R3.0
syd-0337/1.5 – R3.0 – 05.2013
FXS mode: Phone/fax
In this mode the following analogue terminals can be connected:
• Analogue phones with DTMF or pulse dialling (earth key is not supported)
• Radio units for cordless phones
• Group 3 fax
1)
• Answering machines
• Modem
Fig. 56 Connection for FXS mode: Phone/fax
Ports 1.5 and 1.6 on the call manager card and in each case the first two ports of
FXS cards (X.1 and X.2) are designed for long lines. The no-load voltage at these
ports is 51 VDC. All the other ports have a no-load voltage of 30 VDC. The loop cur-
rent is limited to 25 mA on all ports.
Tab. 67 Cable requirements for FXS mode: Phone/fax
1)
Transmission with the T.38 protocol is recommended for Fax over IP. The corresponding DSP resources need
to be allocated.
Ports for long lines Normal ports
Cores paires  cores 1  21  2
Stranded only for lengths > 200 m only for lengths > 200 m
Wire diameter, core 0.4 … 0.8 mm 0.4 … 0.8 mm
FXS resistance max. 2  625  max. 2  250 
Line length for a wire diameter of
0.6mm.
max. 10 km max. 4 km
Screening not required not required
a
b
FXS interface