in cwna guide on page 188, ch:3...they have mentioned some abot non overlapping channels
.802.11 DSSS-30 Mhz spacing(6 channels)
.802.11b HR-DSSS-25 Mhz spacing(5 channels)
.802.11a OFDM-20 Mhz spacing(4 channels)
.802.11g ERP-OFDM-25 Mhz spacing(5 channels)
as we have studied that there are only three non overlapping channels in HR-DSSS than how it can be posible of having 6 and 5 non overlapping channels in that
please explain it
The four bullets at the bottom of CWNAv3 study guide, page 188, are accurate.
The values in parenthesis are not the number of non-overlapping channels, but instead the number of 5 MHz spaces between channel centers of those non-overlapping channels. (What a horrible sentence.)
All 802.11 channels are centered every 5 MHz, whether in 2.4 GHz or 5 GHz bands.
DSSS transmissions must be centered on 2.4 GHz channels at least "six" 5 MHz spaces apart. For instance channels 1 and 7.
HR/DSSS and ERP transmissions must be centered on 2.4 GHz channels at least "five" 5 MHz spaces apart. For instance the universally familiar channels 1, 6, and 11.
OFDM transmissions must be centered on 5 GHz channels "four" 5 MHz spaces apart. Recent amendments allow weaker OFDM transmissions to be centered every channel or every other channel.
I hope this helps. Thanks. /criss
thaks criss for replying i really removed headache of mine and kapil