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674 Bluetooth

and Wireless Fidelity interference

The Bluetooth

wireless technology and WiFi interference is a normal

part of network operation. If Bluetooth

wireless technology and WiFi

must coexist, the following mitigation techniques can produce a more

satisfactory user experience when WiFi and Bluetooth

wireless

technology operate simultaneously.

•

The IP Phones 1140E/1150E/1165E can transmit at up to 0 decibels

(dBm). The IP Phone Bluetooth

wireless technology receivers can

handle an interference that is on channel at 11 decibels (dB) less than

the desired signal. That is, the required signal-to-noise level is 11 dB.

For example, assume no loss exists in the antenna design, at 1

meter away the power drops to -40 dBm. If the environment shows

activity throughout the band at -51dBm, performance of the Bluetooth

wireless technology headset is optimal only within 1 meter of the

IP Phone 1140E due to the required Signal-to-Noise ratio of 11 dB.

However, this calculation is based on an ideal scenario.

• Due to FCC regulations, Bluetooth

wireless technology is required

to hop amongst at least 40 of the 80 available channels in the 2.4

GHz band. Hence, Bluetooth

wireless technology performance is

optimized if approximately half of the 2.4 GHz band possess low levels

of WiFi activity. Low levels of WiFi activity is determined by the desired

performance versus distance of the Bluetooth

wireless technology

headsets.

Clients operate on the channels along with wireless access point (WAP).

Therefore, the interference zone can be up to twice the WAP range. The

interference levels subside on a per-channel basis only when a user

device is not nearby.

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.06 30 April 2010