Mitel 470 System Manual page 121

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)
Core pairs × cores
Stranded
Wire diameter, core
Screening
Characteristic impedance
Wave attenuation
Near/crosstalk attenuation
PRI primary rate interface, network-side
Mains power
Exchange
Fig. 40 PRI primary rate interface on NT1
Tab. 50 Connection of PRI primary rate interface
NT1
Socket Pin
1
2
3
4
5
6
7
8
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".
Mitel 470 as of R4.1
syd-0585/1.2 – R4.1 – 08.2016
NT1
U
PRI
Cable cores
Straight patch cable
PRI sig-
1)
nal
TxA
TxB
–
RxA
RxB
–
–
–
2 × 2 (short distances also 1 × 4)
yes
0.4...0.6 mm
yes
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)
RXA
RXB
Communication
TXA
server
TXB
Communication server
PRI signal
RxA
RxB
–
TxA
TxB
–
–
–
Installation
Pin Socket
1
2
3
4
5
6
7
8
121