Installation
132
Mitel SMB Controller
syd-0657/2.0 – R6.0 – 09.2018
Fig. 50
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. 56
Requirements for an S bus cable
Core pairs
×
cores
Stranded
Wire diameter, core
Screening
1
×
4 or 2
×
2
yes
0.4…0.6 mm
recommended
Ohmic resistance
Characteristic impedance
Wave attenuation
Near/crosstalk attenuation
< 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)
c
f
e
d
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
2x100
Ω
Fit resistors at bus extremity only
Connect housing
screens
Front view of
RJ45
RJ45, double