Coverage Calculation - Nortel CS 1000 Manual

the customer becomes dissatisfied afterwards, you can refer to the
agreement. Also, be aware that, if the speech quality is low in certain
areas, the customer may perceive that you delivered a low-quality
system.
•
If a lower voice quality level is acceptable, ensure that all calls are
received and dropped calls are avoided.

Coverage calculation

The coverage can be calculated in advance, before executing a site
survey. Calculation is based on the following theory.
The transmission path between the DAP and the handset is subject to
radio-propagation related peculiarities, such as:
•
Dynamically changing environment
•
Signal attenuation due to fixed and moving objects
•
Multi-path propagation of the signal
The signal from the transmitter is attenuated in the link before it arrives
at the receiver. The link consists of a transmission path through the air
and through obstacles such as walls. The air and the obstacles cause
attenuation called insertion loss. The following table shows typical insertion
losses for some obstacles.
Table 2
Typical insertion losses of some obstacles
Glass
Glass, metal reinforced grid
Glass, metal clad sunguard
Wall, indoor, plaster, wood
Wall, brick, 10 cm
Wall concrete, 10 cm
Wall concrete, 15 cm
Wall concrete, 20 cm, large windows
Wall concrete, 40 cm
Ceiling, concrete, reinforced, tiles
With the DECT equipment, the available link budget is 38 dB. This is the
maximum allowed loss in the link, under constraints of excellent and good
speech quality and the ability for the user to move.
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Material
Nortel Communication Server 1000
SIP DECT Fundamentals
NN43120-123 02.02 30 March 2010
Site planning 35
Insertion loss (dB)
2
10
10
2
3.5
6
9
6
17
17-20