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The signal strength affects the effective transmission speed of a wireless connection, having immediate effect on the quality of a VoIP call. Low signal causes endpoint hardware to choose lower transmission speeds, possibly invalidating the initial choice of codec. Low signal levels affect the number of packet retries, causing out-of-order packets and contributing to jitter. Needless to say, lower than usual signals may drop transmission rates to the point where voice transmission quality becomes unacceptable.
A network analyzer continuously monitors and displays signal levels and transmission rates of all wireless stations, allowing network administrators detect insufficient rates, make necessary hardware relocations and/or perform codec adjustments to match the effective bandwidth.
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