User's Manual

673
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Appendix
Bluetooth
®
and Wireless Fidelity
interference
Bluetooth
®
is a wireless communication technology that is especially
appropriate for cable replacement, but is not a personal mobility
technology. The IP Phones 1140E/1150E/1165E are Class 2 Bluetooth
®
wireless technology devices. This means the Bluetooth
®
wireless
technology devices work up to 10 meters. However, audio performance in
a Bluetooth
®
wireless technology headset suffers if you walk away from
the phone. After 10 meters, the link drops.
Both Bluetooth
®
wireless technology and Wireless Fidelity (WiFi) wireless
protocols operate in the 2.40 Industrial, Scientific and Medical (ISM)
Radio Frequency (RF) band. Bluetooth
®
wireless technology and WiFi
wireless communications can interfere with each other. Interference
can occur between Bluetooth
®
wireless technology and WiFi wireless
communications, which results in lowered data throughput. Bluetooth
®
wireless technology utilizes a frequency hopping mechanism so that
it does not stick in a fixed channel like WiFi does and the master and
slave devices keep hopping synchronously during whole connecting
time. However, occasionally Bluetooth
®
wireless technology devices can
hop into a channel, which other WiFi devices occupy and can encounter
corrupted packet at that hop. The Bluetooth
®
wireless technology headset
(audio-oriented) devices are more susceptible to radio interference than
other data-oriented devices because Synchronous Connection-Oriented
Link (SCO) data do not re-transmit in the Bluetooth
®
wireless technology
protocol. When an audio packet is corrupted or lost, you can hear
crackling and popping noise due to the missing data. This is evident when
you listen to dial tones or other continuous audio tones. During regular
speech, this effect is less perceptible.
Nortel Communication Server 1000
IP Phones Fundamentals
NN43001-368 05.06 30 April 2010
Copyright © 2003-2010 Nortel Networks. All Rights Reserved.
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