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RA-2/3
7 - RF Description and Troubleshooting
WLAN RF Description
WLAN RF has functionality required for IEEE802.11b 2.4 GHz high-rate WLAN. The radio is
half-duplex with no frequency duplex. Transmission and receiving is on the same frequency.
Transmission times are determined by running a distributed medium access control protocol
leaning on clear channel assessment and back-off procedures. The protocol is known as
CSMA/CA, Carrier Sense Multiple Access / Collision Avoidance.
EMC leakage is prevented by using a metal can. Heat generated by the circuitry is conducted
out via the PWB ground planes and a metallized shield.
Parameter
Frequency range
Channel spacing
Number of channels
Frequency accuracy
Modulation
Data rates
Issue 1 09/04
Table 12: General transceiver characteristics
2412 – 2462 MHz (US bands)
2412 – 2472 MHz (EU bands)
5 MHz
11 channels in US
13 channels in EU
13 channels in France
± 25 ppm
11 Msymbols/s BPSK/QPSK
1 Mb/s BPSK Barker spreading
2 Mb/s QPSK Barker spreading
5.5 Mb/s and 11 Mb/s QPSK and CCK coding
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Troubleshooting
