Hi Matthijs! Thank u for your email but for me your reply is a little complicated to understand, so I shall explain u my setup.
I get my internet service from Virgin Media on fibre optic cable 60 Mbps. Virgin provide a WIFI unit were I Disabled the wireless. The Fonera is coneccted direct to the modem (Virgin calls it Superhub). ( www.virginmedia.com) When the Fonera was on on 2.3.6.1 I got speed 150 Mbps with my Edimax aerial. Now on 2.3.7.0 candidate 1 + 2 its 72 Mbps. I do Not understand much of your explanation. But is there more update for the 2.3.7.0 firmware on the way.?? At present my Fonera is on H20/H40 and country UK. Should I go back to 2.3.6.1 where I had 150 Mbps or shall I wait for the next updates?? bye Dani On 20 November 2012 16:22, Matthijs Kooijman <[email protected]> wrote: > Hi Dani, > > I was a bit busy with other things, hadn't had time to look into this > issue until now. > > > Firmware Version: *2.3.7.0 *Candidate 2 and my speed is 72.0 Mbps > > instead of 150 Mbps before the update. > Looking at these speeds and comparing them with the 11n supported > speeds, it looks like your connection is using a single antenna / > spatial stream (probably because your wifi network card only has one > antenna) and you're using single-channel / HT20 / 20Mhz mode (see > http://en.wikipedia.org/wiki/IEEE_802.11n-2009#Data_rates which shows > 72.20 Mbps for MCS7 + short GI + 20Mhz channel). The 150Mbps you used to > get, is the same mode, but with a 40Mhz channel, so I suspect your HT40 > mode has stopped working. Note that all of this is assuming that the > bitrates you mention are pretty exact, if you've seen 130Mbps and > written 150Mbs, this conclusion is probably different. > > Some things that might help getting this working again: > - In Settings -> Wireless, check if HT20/HT40 mode is set. > - In the same page, check if the country is set correctly. > > Furthermore, it seems that HT40 mode can also be automatically disabled > due to environmental conditions (e.g., other access points also using > the spectrum). The reasoning here is that running an AP in 40Mhz mode > uses around two-third of the availble 2.4Ghz spectrum, which can > cause severe interference when there are a lot of other APs around. In > my testing, I've seen 40Mhz mode work on one out of 5 associations, so I > suspect I'm seeing the same "interference autodetect" at work. > > If this is indeed the case, then there's probably not much you can do, > except getting a wifi network card that actually has two antennas > (usually referred to as 2x2 or MIMO). > > If you have Linux on your wifi client, could you send over the output of > the "iw dev wlan0 link" and "iw dev wlan0 scan dump" commands? If not, > perhaps you have some wifi connection utility that shows detailed > connection info (such as the MCS profile used and if the connection is > using HT20 or HT40)? > > Also, on which firmware did you see the higher bitrate? > > Gr. > > Matthijs > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (GNU/Linux) > > iEYEARECAAYFAlCrrkoACgkQz0nQ5oovr7zhUwCgj0dvVoEEcyC4yZ6A/qkZ0aTU > 8D8Ani01dRos7SI6IRfANqFILam/tO45 > =LbZz > -----END PGP SIGNATURE----- > > _______________________________________________ > Development mailing list > [email protected] > http://fonosfera.org/mailman/listinfo/development > >
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