On Tue 12 Nov 2013 11:55:43 AM GMT, Sergey Ryazanov wrote:
> Hi list,
> we test pretty old hardware based on AR5414 chip with pretty old
> madwifi driver, which even use binary hal. Our spectral analyzer shows
> that in 2.4GHz band this chip transmits OFDM-preamble with any of the
> OFDM rates (6-54 mbps), instead of .11b-compatable DSSS-preamble. Does
> anybody could provide some clue: is this chip supports DSSS-OFDM mode
> according to section 19.7 of IEEE 802.11-2012?
> When I digging the ath5k code I faced the AR_PHY_MODE (0xa200)
> register, which seems to controls the behavior of chip. This register
> contains two interesting bit:
> AR_PHY_MODE_MOD_CCK bit 0 (0x00000001)
> AR_PHY_MODE_MOD_DYN bit 3 (0x00000004)
> If I am correctly understand, _MOD_DYN just enables the CCK (DSSS)
> block. But what the purpose of the AR_PHY_MODE_MOD_CCK bit?

>From what I know:
MOD_DYN = CCK + OFDM (for g)
MOD_CCK = CCK only (for b)

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