Installation
122
Aastra 470 ab R3.0
syd-0337/1.5 – R3.0 – 05.2013
Cable Requirements
Tab. 43 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. 35 Basic access on NT1
The assignment of the RJ45 connector is identical on the NT-side and on the side of
the communication server.
Tab. 44 Wiring of the BRI basic rate interface network-side
Cores paires cores 1 4 or 2 2
Stranded yes
Wire diameter, core 0.4…0.6 mm
Screening recommended
Characteristic impedance < 125 (100 kHz), < 115 (1 MHz)
Wave attenuation < 6 dB/km (100 kHz), < 26 dB/km (1 MHz)
Near / crosstalk attenuation > 54 dB/100 m (1 kHz bis 1 MHz)
NT1
Cable cores
Straight patch cable
Communication server
Socket Pin
BRI-T sig-
nal
BRI-T sig-
nal
Pin Socket
1– –1
2– –2
3c c3
4f f4
5e e5
6d d6
7– –7
8– –8
NT1
BRI-T BRI-T
[1]
U
a
b
c
d
e
f
c
d
e
f
[2]
Exchange
Communica-
tion server
Mains power
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