Mitel 470 - Page 121

Installation
121
Mitel 470 as of R4.1
syd-0585/1.2 – R4.1 – 08.2016
Cable Requirements
The connection to NT1 (Network Termination) is implemented using commercially
available screened cables with 8-pin RJ45 connectors at both ends, e.g. S-FTP 4P,
PVC, Cat. 5e.
Tab. 49 Cable requirements for the primary rate interface)
PRI primary rate interface, network-side
Fig. 40 PRI primary rate interface on NT1
Tab. 50 Connection of PRI primary rate interface
Core pairs × cores
Stranded
Wire diameter, core
Screening
2
× 2 (short distances also 1 × 4)
yes
0.4...0.6 mm
yes
Characteristic impedance
Wave attenuation
Near/crosstalk attenuation
90 to 130
Ω (1 MHz)
< 6 dB/km (100 kHz), < 26 dB/km (1 MHz)
> 54 dB/100 m (1 kHz to 1 MHz)
NT1
Cable cores
Straight patch cable
Communication server
Socket Pin
PRI sig-
nal
1)
1) Other designations are also possible on the NT1 such as: "S2m ab" instead of "TxA/TxB" and "S2m an" in-
stead of "RxA/RxB".
PRI signal Pin Socket
1TxA RxA1
2TxB RxB2
3– –3
4RxA TxA4
5RxB TxB5
6– –6
7– –7
8– –8
NT1
U
PRI
RXA
RXB
TXA
TXB
Exchange
Mains power
Communication
server















