Motorola ES400, User Manual

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Chapter 9 Bluetooth
Introduction
Bluetooth-equipped devices can communicate without wires, using frequency-hopping spread spectrum (FHSS)
radio frequency (RF) to transmit and receive data in the 2.4 GHz Industry Scientific and Medical (ISM) band
(802.15.1). Bluetooth wireless technology is specifically designed for short-range (10 meters (30 feet))
communication and low power consumption.
ES400s with Bluetooth capabilities can exchange information (e.g., files, appointments, and tasks) with other
Bluetooth enabled devices such as printers, access points, and other Enterprise Smart Phones. To use the ES400
as a modem, create a dial-up modem connection between a computer and ES400.
Adaptive Frequency Hopping
Adaptive Frequency Hopping (AFH) is a method of avoiding fixed frequency interferers, and can be used with
Bluetooth voice. All devices in the piconet (Bluetooth network) must be AFH-capable in order for AFH to work.
There is no AFH when connecting and discovering devices. Avoid making Bluetooth connections and discoveries
during critical 802.11b communications. AFH for Bluetooth consists of four main sections:
•
Channel Classification - A method of detecting an interference on a channel-by-channel basis, or pre-defined
channel mask.
•
Link Management - Coordinates and distributes the AFH information to the rest of the Bluetooth network.
•
Hop Sequence Modification - Avoids interference by selectively reducing the number of hopping channels.
•
Channel Maintenance - A method for periodically re-evaluating the channels.
When AFH is enabled, the Bluetooth radio “hops around” (instead of through) the 802.11b high-rate channels. AFH
coexistence allows Motorola Enterprise Smart Phones to operate in any infrastructure.
The Bluetooth radio in this ES400 operates as a Class 2 device power class. The maximum output power is 2.5
mW and the expected range is 10 meters (32.8 feet). A definition of ranges based on power class is difficult to
obtain due to power and device differences, and whether one measures open space or closed office space.
NOTE
It is not recommended to perform Bluetooth wireless technology inquiry when high rate 802.11b operation is
required.