Mitel 470 - Page 89

Expansion Stages and System Capacity
89
Mitel 470 as of R4.1
syd-0585/1.2 – R4.1 – 08.2016
The basic system and the interface cards generate their own local power supply with
an 80% efficiency. The calculated value must therefore be multiplied by a factor of 0.8
at the end. The calculation formula is therefore as follows:
P terminals = (P total - P hw) × 0.8
The total power requirements of all connected terminals must not exceed the value
P
terminals.
The number of permissible terminals per system depends on the power requirements
of the individual terminals. Tab. 37
provides details of the average power requirements
of the terminals.
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.
Interface card 16FXO 2.5
Interface card 4FXS 1.5
Interface card 8FXS 2
Interface card 16FXS 3
Interface card 32FXS 4.5
Interface card 8DSI 2
Interface card 16DSI 3
Interface card 32DSI 4
DSP module SM-DSPX1, SM-DSP1 0.75
DSP module SM-DSPX2, SM-DSP2 1.5
IP Media module EIP1-8 2
IP Media module EIP1-32 2.5
4TAX, 8TAX, 16TAX call charge module 0.1
Applications card CPU2 21
1)
Redundant fan unit RFU 3.5
1) Up to 9 W more if the front-side USB interfaces are connected.
Designation Output P [W]