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Départ. Technical support- CM640
PHILIPS Consumer
Communications
Centre du Mans
7.10.4 Bluetooth communications
Packet format
Access code (72 bits)
This area supports the identification and synchronization of Bluetooth instruments. A typical 1010 pattern is sent as
4-bit preamble at the beginning. A measuring instrument must be able to accurately measure the frequency
deviation of the DUT within 4µs.
Header (54 bits)
This area of the packet contains organization information important for the call : the current address of the called
partner into the pico network, packet types used and also flow control and handshake information.
Payload (0 to 2744 bits)
Packet area of variable length where payload data is normally transmitted. The maximum length of the payload is
defined so that at least 220µs are available between the end of the payload and the change of the timeslot for the
synthesizer of the Bluetooth signal to settle to the next frequency channel.
Frequency hopping and time multiplex
A Bluetooth subscriber always operates alternately as transmitter or receiver within a timeslot.
RF hop frequency : f(k)
Master
even-numbered
time slot only
Slave
odd-numbered
time slot only
PHILIPS ELECTRONICS N.V. 1999
All rights reserved. Reproduction in whole
or in part is prohibited without the written
consent of the copyright owner.
PROCEDURE
Service Repair Support
72
54
Access
packet
code
header
625 µsec
COMPANY RESTRICTED
0-2745
payload
f(k +1)
+/-10 µsec
220
µsec
VY-V-640-82x
VY-V-640-82x
Page : 28 of 71
Langue : EN
Date : 25/02/03
f(k +2)
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