Re: [ath5k-devel] Atheros AR5xxx DSSS-OFDM mode support
2013/11/12 Nick Kossifidis : > 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 (0x0001) >> AR_PHY_MODE_MOD_DYN bit 3 (0x0004) >> >> 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) > Thank you Nick, for your quick answer, may be you know, why we need such explicit option (I mean MOD_CCK bit)? If we would like to act as pure dot11b node, then we could simply limit rate set to DSSS/CCK rates only. Did you know something about DSSS-OFDM mode support in the AR5xxx chips, is it possible at all? -- BR, Sergey ___ freebsd-wireless@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-wireless To unsubscribe, send any mail to "freebsd-wireless-unsubscr...@freebsd.org"
Re: [ath5k-devel] Atheros AR5xxx DSSS-OFDM mode support
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 (0x0001) > AR_PHY_MODE_MOD_DYN bit 3 (0x0004) > > 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) ___ freebsd-wireless@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-wireless To unsubscribe, send any mail to "freebsd-wireless-unsubscr...@freebsd.org"
Atheros AR5xxx DSSS-OFDM mode support
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 (0x0001) AR_PHY_MODE_MOD_DYN bit 3 (0x0004) 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? -- BR, Sergey ___ freebsd-wireless@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-wireless To unsubscribe, send any mail to "freebsd-wireless-unsubscr...@freebsd.org"
