Avaya Communication Server 1000 Installation And Commissioning Manual page 50

Planning
For information about using the Site Survey mode, see Avaya WLAN Handsets Fundamentals
(NN43001-505).
Important:
The handsets do not require connectivity to a WLAN IP Telephony Manager 2245 or the Call
Server to enable the Site Survey mode to be used. The minimum configuration required is
the Extended Service Set Identifier (ESSID) of the WLAN or test AP and the WEP keys, if
applicable.
Access point requirement considerations for b radio
Each site is unique in its AP requirements. Consider the following points when determining
how many APs are needed and where to place them:
• Minimum Radio Signal Strength—All APs in the coverage area must receive a signal
strength better than -70dBm. Measurement is made in negative dBm, which measure the
amount of signal loss due to distance. Therefore, stronger signals are those with smaller
values. For example, -50 and -60 indicate stronger signals than -70; -80 is a weaker,
poorer signal than -70.
• Adjacent APs and channel interference—In order to avoid undesirable interference from
adjacent APs, ensure that adjacent APs do not use channels that overlap on the same
frequencies.
For more information, see
figure, channels on the same horizontal line do not overlap. In the coverage area of any
given AP, signals from other APs using overlapping channels must be at least -15 to
-20dBm weaker. Because the Site Survey mode displays signals only from APs on the
same Extended Service Set ID (ESSID), check for signals from APs using all ESSIDs to
avoid channel overlap.
50 Avaya WLAN IP Telephony Installation and Commissioning
Figure 4: Frequencies used by b radio on page 51. In the
November 2010