A block of wood you say? Is this radio a witch!? :-)
On Jan 31, 2017 3:24 AM, "Gino Villarini" <g...@aeronetpr.com> wrote: > Some dampening material in front of the antenna, maybe wood? > > From: Af <af-boun...@afmug.com> on behalf of Faisal Imtiaz < > fai...@snappytelecom.net> > Reply-To: "af@afmug.com" <af@afmug.com> > Date: Monday, January 30, 2017 at 10:17 PM > To: "af@afmug.com" <af@afmug.com> > Subject: Re: [AFMUG] B11, TDMA, and TCP > > Thanks Chris & Chris.. for asking the question I had and answering it. :) > > For Chris T. > > For those of us for who 10db is till too hot... > Do you think Engineering can come with with some sort of a insert that > we could possibly install in the wave guide .. which could say dampen 3-5 > db worth of Tx Power ? > > I think such 'disc' would be very helpful for the short links like the one > Chris & others have .. > > Regards > > Faisal Imtiaz > Snappy Internet & Telecom > 7266 SW 48 Street > Miami, FL 33155 > Tel: 305 663 5518 x 232 <(305)%20663-5518> > > Help-desk: (305)663-5518 <(305)%20663-5518> Option 2 or Email: > supp...@snappytelecom.net > > > > *Gino Villarini* > President > Metro Office Park #18 Suite 304 Guaynabo, Puerto Rico 00968 > > ------------------------------ > > *From: *"Chris Trout" <ch...@mimosa.co> > *To: *af@afmug.com > *Sent: *Monday, January 30, 2017 9:00:31 PM > *Subject: *Re: [AFMUG] B11, TDMA, and TCP > > Hi Chris, > > > > Yes, there is a hardware limitation. The diode detectors used in the PA to > control Tx power lose dynamic range at low power. I’ve raised your request > to our engineering team for future product designs. > > > > Chris Trout > > Mimosa Networks, Inc. > > > > *From: *Af <af-boun...@afmug.com> on behalf of Chris Wright < > ch...@velociter.net> > *Reply-To: *"af@afmug.com" <af@afmug.com> > *Date: *Monday, January 30, 2017 at 8:23 AM > *To: *"af@afmug.com" <af@afmug.com> > *Subject: *Re: [AFMUG] B11, TDMA, and TCP > > > > In my case, even 10dB output on both sides is still too hot. Is the 10dB > minimum power output a hardware limitation or is it possible you can throw > that on the feature requests pile? > > > > Thanks, > > > > Chris Wright > > Network Administrator > > > > *From:* Af [mailto:af-boun...@afmug.com <af-boun...@afmug.com>] *On > Behalf Of *Chris Trout > *Sent:* Sunday, January 29, 2017 5:39 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] B11, TDMA, and TCP > > > > Hi Faisal, > > > > TPC is designed to do this automatically, but so far we have limited how > much change it can make, and are still tuning its behavior in cases of > unequal power per side of the link, very low RSSI on one or more chains, > and very high RSSI. Some of these changes will be included in the next > backhaul firmware release. > > > > In our experience, targeting 30 dB of SNR per chain results in the best > performance, so for now we recommend adjusting Tx power to get near that > level, and then let TPC manage fine adjustments from there. > > > > Chris Trout > > Mimosa Networks, Inc. > > > > *From: *Af <af-boun...@afmug.com> on behalf of Faisal Imtiaz < > fai...@snappytelecom.net> > *Reply-To: *"af@afmug.com" <af@afmug.com> > *Date: *Thursday, January 26, 2017 at 10:36 AM > *To: *"af@afmug.com" <af@afmug.com> > *Subject: *Re: [AFMUG] B11, TDMA, and TCP > > > > Hi Chris, > > > > What is the optimum SNR or aka the sweet spot. > > > > Which actually leads to another question which I have... > > > > On my link, I had to manually reduce TX Power to 10dBm (lowest possible) > in order to end up with a SNR of 35/37... > > > > Can we possible see this being done by TPC vs a manual power decrease ? > > > > Regards. > > > > Faisal Imtiaz > Snappy Internet & Telecom > 7266 SW 48 Street > Miami, FL 33155 > Tel: 305 663 5518 x 232 <(305)%20663-5518> > > Help-desk: (305)663-5518 <(305)%20663-5518> Option 2 or Email: > supp...@snappytelecom.net > > > ------------------------------ > > *From: *"Chris Trout" <ch...@mimosa.co> > *To: *af@afmug.com > *Sent: *Thursday, January 26, 2017 12:32:32 PM > *Subject: *Re: [AFMUG] B11, TDMA, and TCP > > Great point, Tim. I have updated our documentation. > > > > Transmit compression starts at 27 dBm Tx power on backhaul products. TPC > backs off from this value automatically if SNR allows. > > > > Mimosa backhaul radios are capable of associating at relatively high Rx > power levels (between -30 and -20 dBm). However, higher power levels cause > the receivers to saturate, and this increases the error vector magnitude > (EVM). For this reason, Mimosa recommends designing links with -30 dBm or > lower received power to avoid saturation. > > > > To optimize RF performance, adjust Tx power on the AP while monitoring > both Rx power and EVM on the Station side of the link. Tx power should be > set to a value that results in the lowest EVM value. > > > > The only reason why some compression or saturation may be acceptable is in > the case of low SNR, which has a larger effect on overall performance. > > > > Chris Trout > > Mimosa Networks, Inc. > > > > *From: *Af <af-boun...@afmug.com> on behalf of "Hardy, Tim" < > tha...@comsearch.com> > *Reply-To: *"af@afmug.com" <af@afmug.com> > *Date: *Wednesday, January 25, 2017 at 6:47 PM > *To: *"af@afmug.com" <af@afmug.com> > *Subject: *Re: [AFMUG] B11, TDMA, and TCP > > > > Chris, > > It might help us design these properly if we knew what the saturation > levels were. We have these for most other radios. > > Thanks, > > Tim > ------------------------------ > > *From:* Af <af-boun...@afmug.com> on behalf of Chris Trout < > ch...@mimosa.co> > *Sent:* Wednesday, January 25, 2017 9:22:14 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] B11, TDMA, and TCP > > > > The PHY (Layer 1) is affected by EVM and PER which cause changes in > modulation. > > The MAC (Layer 2), where TDMA lives, makes use of the PHY but does not > change it directly. > > Changes in the amount and direction of traffic across the link do affect > EVM and PER, however. > > > > It is likely that the PHY rate is more stable on your link at 1300 Mbps > (MCS7) than at 1560 Mbps (MCS8), and Auto TDMA is reacting faster to > changing conditions since it sends a shorter duration of packets for > training the PHY rate. > > > > As others have recommended, reducing power will avoid saturating the > receiver, and reduce (improve) EVM. I think that is what we may be seeing > here on a very short link. > > > > Chris Trout > > Mimosa Networks, Inc. > > > > *From: *Af <af-boun...@afmug.com> on behalf of Chris Wright < > ch...@velociter.net> > *Reply-To: *"af@afmug.com" <af@afmug.com> > *Date: *Wednesday, January 25, 2017 at 1:55 PM > *To: *"af@afmug.com" <af@afmug.com> > *Subject: *Re: [AFMUG] B11, TDMA, and TCP > > > > Traffic Split set to Auto: > > PHY 1300/1300 > > > > Traffic Split set to 75/25, 8ms window: > > PHY 1560/1300 > > > > Anyone can see why one should prefer setting the Traffic Split to 75/25 – > it provides more bandwidth in one direction. > > > > Chris Wright > > Network Administrator > > > > *From:* Faisal Imtiaz [mailto:fai...@snappytelecom.net > <fai...@snappytelecom.net>] > *Sent:* Wednesday, January 25, 2017 12:35 PM > *To:* af@afmug.com > *Cc:* Chris Wright > *Subject:* Re: [AFMUG] B11, TDMA, and TCP > > > > Hi Chris, > > > > I want to compare something with my link... > > > > Can you please share what's the listed PHY rates were on your PCN for the > link. > > > > Regards. > > > > Faisal Imtiaz > Snappy Internet & Telecom > 7266 SW 48 Street > Miami, FL 33155 > Tel: 305 663 5518 x 232 <(305)%20663-5518> > > Help-desk: (305)663-5518 <(305)%20663-5518> Option 2 or Email: > supp...@snappytelecom.net > > > ------------------------------ > > *From: *"Chris Wright" <ch...@velociter.net> > *To: *af@afmug.com > *Sent: *Wednesday, January 25, 2017 11:21:12 AM > *Subject: *Re: [AFMUG] B11, TDMA, and TCP > > Power is already at the minimum (10dBm) on both sides. 2.2km link. > > > > Chris Wright > > Network Administrator > > > > *From:* Af [mailto:af-boun...@afmug.com <af-boun...@afmug.com>] *On > Behalf Of *Faisal Imtiaz > *Sent:* Tuesday, January 24, 2017 9:56 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] B11, TDMA, and TCP > > > > >SNR 41, 42, 41, 41 > > > > Turn down your power, and bring the SNR in the 30-35 range... > > it will improve thruput and allow for the higher modulation. > > > > Regards. > > > > Faisal Imtiaz > Snappy Internet & Telecom > 7266 SW 48 Street > Miami, FL 33155 > Tel: 305 663 5518 x 232 <(305)%20663-5518> > > Help-desk: (305)663-5518 <(305)%20663-5518> Option 2 or Email: > supp...@snappytelecom.net > > > ------------------------------ > > *From: *"Chris Wright" <ch...@velociter.net> > *To: *af@afmug.com > *Sent: *Wednesday, January 25, 2017 12:41:37 AM > *Subject: *Re: [AFMUG] B11, TDMA, and TCP > > Firmware 1.4.4 > > SNR 41, 42, 41, 41 > > Flow Control had no effect so it remains disabled for now. > > Sent via mobile phone. > > > On Jan 24, 2017, at 9:05 PM, Faisal Imtiaz <fai...@snappytelecom.net> > wrote: > > What version for firmware is on the radio ? > > > > and What your SNR on the two chains (both directions, i.e. 4 readings). > > > > I can tell you that we do not see the behavior you are describing below... > > But I can also tell you that we had to do some 'tuning' on settings > including flow control .. > > our B11's plug into netonix Switches.... > > > > Regards. > > > > Faisal Imtiaz > Snappy Internet & Telecom > 7266 SW 48 Street > Miami, FL 33155 > Tel: 305 663 5518 x 232 <(305)%20663-5518> > > Help-desk: (305)663-5518 <(305)%20663-5518> Option 2 or Email: > supp...@snappytelecom.net > > > ------------------------------ > > *From: *"Chris Wright" <ch...@velociter.net> > *To: *af@afmug.com > *Sent: *Tuesday, January 24, 2017 8:02:58 PM > *Subject: *[AFMUG] B11, TDMA, and TCP > > According to Mimosa, I should be telling my customers that if they’re > using the most popular metric in the world for testing internet speeds, > they’re doing it wrong (I concede that while this may be technically > correct, my customers – and yours too – don’t do technically correct very > well.” > > > > When TDMA is set to 75/25, 8ms window, MAC Tx/Rx is 980/290. This gives me > as much Tx bandwidth as I require for peak times, but no one client IP can > download more than 20mbps of TCP traffic (from my speedtest.net at the > edge, nor anyone else’s beyond my edge). > > > > When TDMA is Auto, MAC Tx/Rx is 780/780 (lower Tx, which is undesirable as > it’s 100mbps shy of what I need during peak hours), but TCP throughput per > client is greatly increased (150+mbps). > > > > So I’m in a pickle. Either my scrupulous customers can get those coveted > speedtest.net results they love seeing as they run them every thirty > seconds ad-nauseum at the cost of overall Tx capacity of the link. Or I > give myself some headroom in link capacity but the fastest speeds my > 100mbps clients can see is 20mbps. > > > > What’s even stranger is that client upload seems unaffected. I can upload > 150+mbps from my test on the link no matter what TDMA is configured. I hit > up Mimosa’s chat support was as chipper as they were unyielding in their > idea that I should test in a way that caters to the B11’s shortcomings. > I’ve been a Mimosa fanboy for a while now but boy am I feeling burned right > now. > > > > Chris Wright > > Network Administrator > > > > > > > > > > > > >
