Mitel 470 System Manual page 139

Connect housing
screens
Fig. 55 RJ45 connection, double socket
Installation rules
Always terminate the bus extremity with 2 × 100 Ω (0.25 W, 5%)!
Note
Circuit type as per EN/IEC 60950: SELV
Cable Requirements
Tab. 65 Requirements for an S bus cable
Core pairs × cores
Stranded
Wire diameter, core
Screening
Ohmic resistance
Characteristic impedance
Wave attenuation
Near/crosstalk attenuation
Mitel 470 as of R4.1
syd-0585/1.2 – R4.1 – 08.2016
c
f
e
d
2x100
Fit resistors at bus extremity only
RJ45, double
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
Ω
8
1 × 4 or 2 × 2
yes
0.4...0.6 mm
recommended
< 98 Ω/km (conductor), < 196 Ω/km (loop)
< 125 Ω (100 kHz), < 115 Ω (1 MHz)
< 6 dB/km (100 kHz), < 26 dB/km (1 MHz)
> 54 dB/100 m (1 kHz to 1 MHz)
Installation
Front view of
RJ45
139