2’ is the minimum allowable antenna size at 11 GHz. From: Af [mailto:af-boun...@afmug.com] On Behalf Of Faisal Imtiaz Sent: Wednesday, January 25, 2017 11:42 AM To: af@afmug.com Subject: Re: [AFMUG] B11, TDMA, and TCP
Wow... that is a short link for 11ghz.. what size dishes are you using ? 2ft or 1ft ? please tell me 1ft... Are your B11's reporting to the Cloud ? there are more stats which get exposed on the Mimosa Cloud App. I was seeing some strange performance issues.. sort of similar to yours.. (you can see details from my post in the Mimosa Community Forms). Someone pointed out that B11's like to have SNR between 32-35, when it is lower or higher they have modulations issues.. My performance improved after we turned the power down.. my link was a bit longer.. 3.9 miles (6.3km) with 2ft dishes, ... and yes, they do not go below 10dBm on tx power... maybe some sort of a material on the radome to reduce energy ? Regards. Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net<mailto:supp...@snappytelecom.net> ________________________________ From: "Chris Wright" <ch...@velociter.net<mailto:ch...@velociter.net>> To: af@afmug.com<mailto: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] On Behalf Of Faisal Imtiaz Sent: Tuesday, January 24, 2017 9:56 PM To: af@afmug.com<mailto: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 Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net<mailto:supp...@snappytelecom.net> ________________________________ From: "Chris Wright" <ch...@velociter.net<mailto:ch...@velociter.net>> To: af@afmug.com<mailto: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<mailto: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 Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net<mailto:supp...@snappytelecom.net> ________________________________ From: "Chris Wright" <ch...@velociter.net<mailto:ch...@velociter.net>> To: af@afmug.com<mailto: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<http://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<http://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
