STLC2411 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STLC2411' PDF : 25 Pages View PDF
STLC2411
Technical perspective - Extended SCO
eSCO incorporates CRC, negotiable data rate, negotiable retransmission window and multi-slot packets.
Retransmission of lost or corrupted packets during the retransmission window guarantees on-time deliv-
ery.
Figure 4. eSCO
SCO
SCO
SCO
SCO
ACL
ACL
SCO
SCO
t
eSCO retransmission window
7.7 V1.2 detailed functionality - Adaptive Frequency Hopping
User Perspective - Adaptive Frequency Hopping
In the Bluetooth spec 1.1 the Bluetooth devices hop in the 2.4 GHz band over 79-channels. Since WLAN
802.11 has become popular, there are specification improvements in the 1.2-SIG spec for Bluetooth
where the Bluetooth units can avoid the jammed bands and thereby provide an improved co-existence
with WLAN.
Technical perspective - Adaptive Frequency Hopping
Figure 5. AFH
f
AFH(79)
WLAN used frequency
t
f
AFH(19<N<79)
WLAN used frequency
t
First the Master and/or the Slaves identify the jammed channels. The Master decides on the channel dis-
tribution and informs the involved slaves. The Master and the Slaves, at a predefined instant, switch to the
new channel distribution scheme.
No longer jammed channels are re-inserted into the channel distribution scheme. AFH uses the same hop
frequency for transmission as for reception.
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