Awesome, I am already learning so much from this mailing list. So it sound like the author was right. So boosting the power output on the AP will more than likely boost the TX (downlink) speed on the AP side, but do nothing on the RX speed side of the AP since nothing from the clients sending perspective has changed right?
On Thu, Nov 13, 2014 at 3:43 PM, Ben West <b...@gowasabi.net> wrote: > Yes, radios will negotiate different rx/tx rates to each other, so up to 2 > distinct rates for a single link. On the open source mac80211 > linux-wireless driver you can see this explicitly. The rx/tx on one radio > is the tx/rx on the other. > > root@ap1:~# iw wlan0 station dump > Station 52:e6:fc:XX:XX:XX (on wlan0) > inactive time: 70 ms > rx bytes: 769202553 > rx packets: 4644034 > tx bytes: 326581907 > tx packets: 465139 > tx retries: 76461 > tx failed: 4 > signal: -56 [-57, -62] dBm > signal avg: -55 [-57, -62] dBm > tx bitrate: 117.0 MBit/s MCS 14 > rx bitrate: 86.7 MBit/s MCS 12 short GI > authorized: yes > authenticated: yes > preamble: long > WMM/WME: yes > MFP: no > TDLS peer: no > > root@ap2:~# iw wlan0 station dump > Station 62:66:b3:XX:XX:XX (on wlan0) > inactive time: 10 ms > rx bytes: 569548806 > rx packets: 3191667 > tx bytes: 412571117 > tx packets: 490879 > tx retries: 104831 > tx failed: 1 > signal: -57 [-67, -57] dBm > signal avg: -55 [-62, -56] dBm > tx bitrate: 86.7 MBit/s MCS 12 short GI > rx bitrate: 117.0 MBit/s MCS 14 > authorized: yes > authenticated: yes > preamble: long > WMM/WME: yes > MFP: no > TDLS peer: no > > > > > On Thu, Nov 13, 2014 at 3:27 PM, Colton Conor <colton.co...@gmail.com> > wrote: > >> In my situation, we are assuming we are dealing with a location with one >> and only one AP (typical home) and most devices are tablets and smartphones >> who's antenna's and power output can't be modified. Can be either a 1 or 2 >> story home. >> >> So, how much truth is in this article: >> http://tomatousb.org/tut:increasing-wrt54g-transmit-power >> >> The author is claiming that wifi negotiates speed (correct) but in both >> directions in the uplink and downlink side. He is basically claiming if you >> increase the power output at the AP, then the downstream (from AP to >> client) link rate will increase, while the uplink (Client to AP) will stay >> the same. This make sense, but does wifi really established a different PHY >> rate for up and down stream. Is this correct? >> >> >> >> On Thu, Nov 13, 2014 at 3:09 PM, Jack Unger <jun...@ask-wi.com> wrote: >> >>> Going from 20 dB to 26 dB will allow the AP to be heard (with the same >>> reliability) at double the distance away. >>> >>> Yes. If the client power (actually the client EIRP which includes the >>> antenna gain) stays the same then the "uplink" distance from client to AP >>> will still be the same. >>> >>> Yes, increasing the number of APs is one possible solution. Another is >>> to use a higher-gain (more directional) antenna on the AP recognizing that >>> when you increase the AP antenna gain in one direction, you are reducing >>> the gain (and the coverage) in all other directions. >>> >>> jack >>> >>> On 11/13/2014 11:10 AM, Colton Conor wrote: >>> >>> So going from a regular powered 100mw (20db) to a high powered 400mw >>> (26db) is a 6db increase in output power. So you are saying going from >>> regular to high powered is a double in coverage size? >>> Doesn't increasing the power output at the AP only increase how loud the >>> AP can "shout" which in term dictates how far the receiver can hear from? >>> If the client can't shout back does this do any good? >>> >>> Most client devices today like iPads, Smartphones, and some laptops >>> can't be modified to increase their antenna gain or power output. So the >>> only option is to increase the numbers of APs, or the transmit >>> power/antennas at the AP right? >>> >>> On Thu, Nov 13, 2014 at 12:25 PM, Jack Unger <jun...@ask-wi.com> wrote: >>> >>>> To double the communications distance (everything else holding >>>> steady) requires an additional 6 dB. Knowing this, you can do the math with >>>> the various antenna gains and power levels to determine performance. >>>> >>>> Regards, >>>> >>>> Jack Unger >>>> WISPA FCC Technical Consultant >>>> >>>> >>>> On 11/13/2014 10:15 AM, Colton Conor wrote: >>>> >>>> We are comparing multiple SOHO routers and modems that have the same >>>> Broadcom chipsets. All of them have 802.11N 2x2 configuration. The only >>>> differences between them are if they have internal or external antennas and >>>> the gain of the antennas (either 2, 3, or 5dbi ratings). In addition, some >>>> sell a high powered wifi radio (400mw) while others have the basic (100mw). >>>> >>>> How much a difference does each of these hardware features make in >>>> overall wifi performance? >>>> >>>> >>>> _______________________________________________ >>>> Wireless mailing >>>> listWireless@wispa.orghttp://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> >>>> -- >>>> Support Honest Gil Fulbright for Senate<http://honestgil.com/#up> >>>> <http://honestgil.com/#up> >>>> >>>> Jack Unger - President, Ask-Wi.Com, Inc. >>>> Author (2003) - "Deploying License-Free Wireless Wide-Area Networks" >>>> Serving the WISP Community since 1993760-678-5033 jun...@ask-wi.com >>>> >>>> >>>> >>>> _______________________________________________ >>>> Wireless mailing list >>>> Wireless@wispa.org >>>> http://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> >>> >>> >>> _______________________________________________ >>> Wireless mailing >>> listWireless@wispa.orghttp://lists.wispa.org/mailman/listinfo/wireless >>> >>> >>> -- >>> Support Honest Gil Fulbright for Senate<http://honestgil.com/#up> >>> <http://honestgil.com/#up> >>> >>> Jack Unger - President, Ask-Wi.Com, Inc. >>> Author (2003) - "Deploying License-Free Wireless Wide-Area Networks" >>> Serving the WISP Community since 1993760-678-5033 jun...@ask-wi.com >>> >>> >>> >>> _______________________________________________ >>> Wireless mailing list >>> Wireless@wispa.org >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> >> >> _______________________________________________ >> Wireless mailing list >> Wireless@wispa.org >> http://lists.wispa.org/mailman/listinfo/wireless >> >> > > > -- > Ben West > http://gowasabi.net > b...@gowasabi.net > 314-246-9434 > > _______________________________________________ > Wireless mailing list > Wireless@wispa.org > http://lists.wispa.org/mailman/listinfo/wireless > >
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