Mitel 470 - Page 118

Installation
118
Mitel 470 as of R4.1
syd-0585/1.2 – R4.1 – 08.2016
Fig. 35 Connection possibilities for BRI network interfaces
Notes
– The interfaces of sockets 1 to 4 can be switched to BRI-S. The interfaces of sockets 5 to 8
are permanently configured to BRI-T.
– Circuit type as per EN/IEC 60950: SELV
The connection from the front panel to the NT1 (Network Termination) is via standard
commercial straight patch cables with 8-pin RJ45 connectors on both sides. With the
appropriate tools you can also create your own cables.
Cable Requirements
Tab. 45 Cable requirements for basic rate interface BRI-T
BRI basic rate interface network-side
[1] Do not connect power supply NT1
[2] Do not fit the jumper
Fig. 36 Basic access on NT1
Core pairs × cores 1 × 4 o 2 × 2
Stranded yes
Wire diameter, core 0.4…0.6 mm
Screening recommended
Characteristic impedance < 125
Ω (100 kHz), < 115 Ω (1 MHz)
Wave attenuation < 6 dB/km (100 kHz), < 26 dB/km (1 MHz)
Near/crosstalk attenuation > 54 dB/100 m (1 kHz to 1 MHz)



#3*





#3*
NT1
BRI-T BRI-T
[1]
U
a
b
c
d
e
f
c
d
e
f
[2]
Exchange
Communica-
tion server
Mains power