Network Interfaces; Basic Rate Interface Bri-T - Mitel Aastra 470 System Manual

4. 7. 2

Network interfaces

Equipping the system with interface cards provides the necessary network inter-
faces. With the exception of the Ethernet interface, which also represents a network
interface via SIP access, there are no network interfaces on the Aastra 470 commu-
nication server.
4. 7. 2. 1

Basic rate interface BRI-T

Fitting BRI interface cards means that BRI network interfaces are available on the
RJ45-sockets on the front panel of the cards. The possible RJ45 sockets are high-
lighted in colour in the figure below.
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 stand-
ard 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
Core pairs  cores
Stranded
Wire diameter, core
Screening
Characteristic impedance
Wave attenuation
Near/crosstalk attenuation
Aastra 470 as of R3.2
syd-0337/1.6 – R3.2 – 09.2014
1  4 o 2  2
yes
0.4...0.6 mm
recommended
< 125  (100 kHz), < 115  (1 MHz)
< 6 dB/km (100 kHz), < 26 dB/km (1 MHz)
> 54 dB/100 m (1 kHz to 1 MHz)
Installation
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