Let me give you an example of Firmware voodoo... Noise detected for link was like nothing on numerous channels... Started with Firm 5.4.1.... link acting weird. So downgraded to 5.3.3. Rocket GPS on one side, Rocket on other. Couldn't downgrade lower, because Rocket-GPS wont allow it. Embedded speed testshows... RCV 27mbps, TX 21mbps, SimutanousBoth TX 1.5mb, RCV 19mbps. Something wrong. Link should be able to do full MCS7 Modulation, but only getting 39mb modulation (MCS4). Couldn't find any way to cure.. Upgrade to 5.4.1, and the throughput becomes symetrical. In a symetrical (simultaneous both) test, I get TX 15mbps, and RCV 15mbps. Problem solved, to get even consistent throughput. (note: Airmax on, Airsync off). Why only getting MCS4 undetermiend.
In this case, I'm theorizing the possible cause.... One side has a dual pol, and the second side has a single pole. Nrmally if this ever occured, we'd cap off the unused port on the single pol side, but in this case we did not. When we climbed we ran into a problem, where we could not get teh dual pol antenna up the tower, with the number of people and supllies we had on site at the time. Because isntall tiem was urgent, we decided to instead use a pre-installed antenna altready up the tower, but it was only single pol. Our plan was that we'd replace the Feed to Dual pol, in a few weeks, on the next climb. We already had a cable waterproofed taped to the radio, since we pre-planned for Dual pol. But I did not have a cap handy. So I left the second chain cable, hanging, and waterproof taped up, temporarilly. Unfortunately, with UBNT, there is no way to stop transmitting on the second chain. The cable end will spew noise at no polarity, since an antenna is not attached, thus there is no cross polarity isolation from the first chain. I think what is happening is the TX signal from the unused secondary chain is self-interfering with the first chain, and because of this the lower SNR only allows the first chain to transmit at a max of MCS4. This is my theory, but I wont know for sure, until we climb in a week to two. But my point here is, which firmware made a huge difference in what results we could get, until fixed. Tom DeReggi RapidDSL & Wireless, Inc IntAirNet- Fixed Wireless Broadband ----- Original Message ----- From: "Stuart Pierce" <[email protected]> To: "WISPA General List" <[email protected]> Sent: Tuesday, October 25, 2011 7:50 AM Subject: Re: [WISPA] UBNT Rocket M5 Throughput > Have you tried to not use auto for ack and set the ack for 1.5 > times the distance ? > > ---------- Original Message ---------------------------------- > From: Mike Hammett <[email protected]> > Reply-To: WISPA General List <[email protected]> > Date: Tue, 25 Oct 2011 05:38:39 -0500 > >>I haven't deployed any Rocket PtP links with less than 55 > signal. >> >>Have you followed UBNT's best practices guide? >>http://www.ubnt.com/downloads/Best%20Practices.pdf >> >>Next step, hit up their forum or their support. Matt at UBNT > worked some >>magic on one of my links and it has been solid ever since. >> >>----- >>Mike Hammett >>Intelligent Computing Solutions >>http://www.ics-il.com >> >> >> >>On 10/24/2011 4:52 PM, Patrick D. Nix, Jr wrote: >>> >>> Ok tried 20mhz, throughput drops about 10mbps to about > 30mbps. My >>> signal is at least 20db better than noise (signal -59 noise - > 85+). >>> ACK is set auto with distance of 2 miles (actual distance is > approx >>> 1.5mi). cable not an issue. any thoughts? >>> >>> *From:*[email protected] [mailto:wireless- > [email protected]] >>> *On Behalf Of *Tom DeReggi >>> *Sent:* Monday, October 24, 2011 3:27 PM >>> *To:* WISPA General List >>> *Subject:* Re: [WISPA] UBNT Rocket M5 Throughput >>> >>> You probably either have 1) noisy channels, 2) incorrect ACK >>> distances, 3) not optimal firmware version, 4) Or some third > party >>> factor effecting testing, such as testing devices that cant > generate >>> that much traffic or buffer sizes of routers. >>> >>> The first thing to try is switch down to 20mhz channel and > see if the >>> speed tests stays the same or higher, or if it drops > proportionally. I >>> bet the 20Mhz channel will perform better. >>> >>> Dont rely on CCQ on its own. Its one indicator, but does not > mean you >>> have a clean channel for sure. Also remember, the Eth port > is limited >>> to 100mb, and if there is cable quality issues such as due to >>> distance, it could autoadjust to half duplex. Test laptop to > PC, >>> isolating RF path, just for grins. It is very rare to find > 40Mhz of >>> clean spectrum for Dual polarity, and even the slightest > packet loss >>> and delay can drastically reduce TCP throughput. >>> >>> Tom DeReggi >>> RapidDSL & Wireless, Inc >>> IntAirNet- Fixed Wireless Broadband >>> >>> ----- Original Message ----- >>> >>> *From:*Patrick D. Nix, Jr > <mailto:[email protected]> >>> >>> *To:*WISPA General List <mailto:[email protected]> >>> >>> *Sent:*Monday, October 24, 2011 3:50 PM >>> >>> *Subject:*Re: [WISPA] UBNT Rocket M5 Throughput >>> >>> Problem is when I turn airmax on the speed really goes in > the >>> toilet. Best I can get is about 20mbps. According to > ubiquiti >>> airmax needs to be off up to 15km links, anything over > that >>> airmax needs to be on. Do you have good success with > short airmax >>> ptp links? >>> >>> *From:*[email protected] >>> <mailto:[email protected]> >>> [mailto:[email protected]] *On Behalf Of *Travis > Johnson >>> *Sent:* Monday, October 24, 2011 2:45 PM >>> *To:* WISPA General List >>> *Subject:* Re: [WISPA] UBNT Rocket M5 Throughput >>> >>> Turn AirMax on. >>> >>> Travis >>> >>> On 10/24/2011 1:36 PM, Patrick D. Nix, Jr wrote: >>> >>> What is the best real TCP throughput up/down anyone is > getting on >>> a PtP ubnt connection? We have two rocket M5 approx 1.5 > mi, CCQ >>> 97-98%, 40mhz channel width, airmax off. >>> >>> Displayed TX/RX rate is 270/270. Real TCP throughput via > iperf >>> radio to radio is 40-45mbps. >>> >>> Are there some config changes needed perhaps? >>> >>> >>> >>> >>> >>> >>> >>> --------------------------------------------------------- > ----------------------- >>> >>> WISPA Wants You! Join today! >>> >>> http://signup.wispa.org/ >>> >>> --------------------------------------------------------- > ----------------------- >>> >>> >>> >>> WISPA Wireless List:[email protected] > <mailto:[email protected]> >>> >>> >>> >>> Subscribe/Unsubscribe: >>> >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> >>> >>> Archives:http://lists.wispa.org/pipermail/wireless/ >>> >>> --------------------------------------------------------- > --------------- >>> >>> >>> >>> --------------------------------------------------------- > ----------------------- >>> WISPA Wants You! 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Join today! >>> http://signup.wispa.org/ >>> ------------------------------------------------------------- > ------------------- >>> >>> WISPA Wireless List: [email protected] >>> >>> Subscribe/Unsubscribe: >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> Archives: http://lists.wispa.org/pipermail/wireless/ >> >> >> > > > > > > ________________________________________________________________ > Sent via the WebMail system at avolve.net > > > > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: [email protected] > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- WISPA Wants You! 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