Signal Performance Measurement - Nortel 7430 Deployment Manual

16
Example: 1.9 GHz - USA
16 Channels.
8 Channels.
8 Channels.
Distance > 25 metres
(Free sight)
Example: 2.4 GHz
24 Channels.
12 Channels.
12 Channels.
Distance > 80 feet/25 metres
(Line of sight)

3.4 Signal Performance Measurement

3.4.1 Q Value
The Q-value is an expression for the bit failure rate in the communication between the Base
Stations and the handset. The highest possible Q-value is 64. At this value there is no bit failures
measured and should provide excellent speech quality. As the wireless handset roams the
coverage area the Q-value will change. When the wireless handset registers a Q-value of 52
equal to 12 bit failures measured, the wireless handset will request a handover to an alternative
Base Station/Repeater or eventually to another channel - frequency/timeslot.
Be aware that the information in the display is only updated once per second, which means that
the number of bit failure can be lower /higher than indicated in the display.
Therefore it is important to accept that as soon as significant fluctuation of the Q-value
occurs the end of the radio coverage has been reached.
NN40110-304 1.1