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C
ABLING INTERFACES
CHAPTER 4 INSTALLATION
Network interfaces
Equipping the system with interface cards provides the necessary network interfaces. With the exception
of the Ethernet interface, which also represents a network interface via SIP access, there are no network
interfaces on the Mitel SMBC mainboard.
Basic rate interface BRI-T
With the appropriate interface cards and wiring adapters, BRI network interfaces can be made available
at RJ45 sockets 1.x...4.x.The possible RJ45 sockets are highlighted in colour in the figure below.
Figure 4.19: Connection possibilities for BRI network interfaces
NOTE:
• The interfaces can be configured on BRI-S using the wiring adapters (see Fitting a wiring adapter
).
• 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
Table 4.7:Cable requirements for basic rate interface BRI-T
Core pairs X cores 1 X 4 o 2 X 2
Stranded yes
Wire diameter, core 0.4…0.6 mm
Screening recommended
Characteristic impedance lt; 125 W (100 kHz), lt; 115 W (1 MHz)
Wave attenuation lt; 6 dB/km (100 kHz), lt; 26 dB/km (1 MHz)
Near/crosstalk attenuation > 54 dB/100 m (1 kHz to 1 MHz)
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