Mitel 470 - Page 144

Installation
144
Mitel 470 as of R4.1
syd-0585/1.2 – R4.1 – 08.2016
Fig. 57 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 current is lim-
ited to 25 mA on all ports.
Tab. 69 Cable requirements for FXS mode: Phone/fax
FXS mode: 2-wire door
In this mode 2-wire door intercoms with DTMF control functions can be connected. The
no-load voltage in this mode is 24 VDC. The loop current is limited to 25 mA.
Ports for long lines Normal ports
Core pairs × cores 1 × 21 × 2
Stranded only with lengths > 200 m only with lengths > 200 m
Wire diameter, core 0.4 … 0.8 mm 0.4 … 0.8 mm
FXS resistance max. 2
× 625 Ω max. 2 × 250 Ω
Line length 0.6 mm diameter max. 10 km max. 4 km
Screening not required not required
a
b
FXS interface