Power Supply Capacity; Supply Power Available For Terminals - Mitel MiVoice Office 400 System Manual

Expansion Stages and System Capacity
3.5

Power supply capacity

The maximum number of terminals connected to the system can be limited by the supply power available
for terminals. It is also important to take note of the maximum load per terminal interface.
3.5.1

Supply power available for terminals

The 40/48 VDC power supply required for the connected terminals is rated for the power requirements of a
typical system configuration.
Table 26: Power output of the 40/48 VDC power supply
Available power output
The number of permissible terminals per system depends on the power requirements of the individual
terminals. To check the power requirements refer to
the average power requirements of the terminals.
The total power requirements of all connected terminals must not exceed the available power output of the
power supply.
Note:
The actually required power supply depends strongly on the call traffic, the wire diameter and the line
length to the connected terminals. The values in the following table are average values under the
following assumption:
• Phones traffic volume: Call Connection 38%, Ringing 2%
• SB-4+ radio unit: Active call connection on 2 channels
• SB-8 radio unit: Active call connection on 4 channels
• Background lighting MiVoice 5380: 30% active
• LEDs on terminals and expansion key modules: 20% active
• Wire diameter: 0.5 mm
• Line length: 200 m
The table below shows the average power requirements of the terminals for a line length of approx. 200 m
and a wire diameter of 0.5 mm.
81
Power output of the 40/48 VDC power supply
24 Watt
Average power requirements of terminals
System Manual for Mitel SMB Controller
for details of
Release 7.1