2009/2/11 mementux <mementux@xxxxxxxxx>: > Hi! > > I would like to make an outdoor radio link at 5GHz between my house and one > of my neighbors. Because I live near an airport, I've looked for European in > force regulation regarding radar detection. I've discovered that ETSI has > released a new normative on Dicember 2008 (EN 301 893 v1.5). This normative > requires that WLAN devices with DFS capability must detect pulse width down > to 0.8us across the bands from 5250 to 5350MHz and from 5470 to 5725 MHz; > moreover they must detect staggered Pulse Repetition Frequency (PRF) radars > with 3 PRF value (I don't excactly know what it means). > > I have two devices with Atheros 5414 radio module, so I've looked for > support of radar detection (and 802.11h) in madwifi driver. I've seen that > the -dfs branch supports the EN 301 893 v1.4.1 and it implements 802.11h > protocol. Looking into the madwifi-dfs code I've seen that the hardware does > the pulse detection and the driver detects the radar recognizing the pulse > patterns (ath/if_ath_radar.c and ath/if_ath_radar.h). > > Because the pulse detection is done in hardware, I suppose that for > detecting pulse width down to 0.8us I need radio modules with newer chipset > like AR9xxx. Is it right? Can't I use my AR5414 radio modules? > So, I've searched in the code of ath9k and mac80211 but I don't find any > implementation of radar detection and 802.11h. Am I wrong? I've read on > http://wireless.kernel.org/en/users/Drivers/ath9k that 802.11h is a feature > of ath9k driver (and consecutively of mac80211, right?). > > I there any way to make an outdoor radio link at 5GHz compliant to the > European regulation with Linux? :-) mac80211 or ath9k does not yet have radar detection support so therefore no mac80211 driver will allow you to use any beaconing mode (AP | IBSS | Mesh) mode on DFS channels yet. Note that not all 5 GHz channels require radar detection though so you could try using one of the non-DFS channels. Check 'iw list' for that. ath9k STA should work with DFS but I didn't work on that myself so will leave someone else to comment on that. Luis -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
