Motorola LEX L10i, Руководство пользователя

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9.3
Bluetooth Device
The LEX L10i supports Motorola Operations Critical Wireless (OCW) Push-to-talk Pod (NNTN8127)
and Bluetooth-enabled device (accessory) through a wireless Bluetooth connection.
Return to Process
Wireless on page 137
Related Links
Adaptive Frequency Hopping on page 152
Bluetooth Security on page 152
Bluetooth Profiles on page 153
Bluetooth Power States on page 154
Bluetooth Radio Power for Android on page 154
Changing the Bluetooth Name on page 155
Discovering Bluetooth Devices on page 156
Selecting Profiles on a Bluetooth Device on page 157
9.3.1
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.
The Bluetooth radio in this device 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 ft.). 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.
NOTICE: It is not recommended to perform Bluetooth wireless technology inquiry when high
rate 802.11b operation is required.
Return to Process
Bluetooth Device on page 152
9.3.2
Bluetooth Security
The current Bluetooth specification defines security at the link level. Application-level security is not
specified. This allows application developers to define security mechanisms tailored to their specific
need. Link-level security occurs between devices, not users, while application-level security can be
MN002347A01-B
Chapter 9: Wireless
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