Appendix C: Fading; Fading - Nortel Meridian Companion Reference Manual

Appendix C: Fading

Fading

Fading causes a signal to vary in strength from good in one moment to poor in
the next moment. When the signal is poor it is considered to be in a "fade." The
length of time that a fade persists can vary from as little as milliseconds to as
much as several seconds.
A slight change in position of the portable can produce great variations in signal
strength. The signal strength change is random, and frequently drops 5 to 15 dB
below average. Fading is more severe for someone staying in one place than for
someone walking. The person staying in place could have their portable in a
faded area for longer periods. The person walking passes quickly through the
fades.
The signal strength in a small room can vary greatly across the width of the
room. As shown in Figure 38, the room is full of constructive and destructive
patterns due to the signal traveling through the building and reflecting in many
directions.
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