Operational Description Jabra BT5010
2006-05-21
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1.
Introduction
The Jabra BT5010 Headset is an lightweight “over the ear” wireless headset utilizing
Bluetooth technology in the 2.4 GHz band for a short range (up to 10 meters) RF link. The
headset contains a microphone and a receiver, and is intended for hands free communications
with mobile telephones containing Bluetooth compatibility or any other device that has a
Bluetooth Audio Gateway. A flexible detachable earhook is used for wearing the headset over
left or right ear.
Headset power is provided by a build in rechargeable Lithium-ion Polymer (LIP) battery. The
battery can be charged with an AC charge adapter.
2.
User Operated Controls
The headset has the following user operated controls:
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Multi Function Button (MFB) for power on/off, to initiate a call, hang up a call etc.
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Volume up and down buttons.
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Pairing button for entering pairing mode.
3.
Indicators
A common red/green/blue LED located close to the volume buttons is used for visual
indication.
A blue LED flashes to indicate Power ON/OFF, Pairing, BT Audio Link Established and
Standby Mode.
A red LED flashes to indicate low battery. Tones in the receiver during the call also indicates
low battery.
A green LED flashes to indicate battery charge complete.
4.
RF Scheme of Operation
The channel is represented by a pseudo-random hopping sequence hopping through the 79 RF
channels. The unique hopping sequence is determined by the Bluetooth device address of the
master; the phase in the hopping sequence is determined by the Bluetooth clock of the master.
The channel is divided into time slots where each slot corresponds to an RF hop frequency.
Consecutive hops correspond to different RF hop fre-quencies. The nominal hop rate is 1600
hops/s. All Bluetooth units participating in a piconet are time- and hop-synchronized to the
channel.
The channel is divided into time slots, each 625 µs in length. In the time slots, master and
slave can transmit packets. A TDD scheme is used where master and slave alternatively
transmit. The RF hop frequency shall remain fixed for the duration of the packet. For a single
packet, the RF hop frequency to be used is derived from the current Bluetooth clock value.
For a multi-slot packet, the RF hop frequency to be used for the entire packet is derived from
