It has to do with CPU load. Since the FDD is running two radios, its doing twice as much work as the one running a single radio. I have observed the FDD links doing 50-55meg in one direction, and my guess is that the most common loaded FDD links will be doing 40-50 in one direction and 10-15 in the other.
With more CPU, I'm sure that the speeds will go up considerably. Matt Larsen Vistabeam.com Travis Johnson wrote: > Matt, > > A quick question on your examples... > > on the 10 mile link you are getting 45Mbps with 20Mhz, but on the > full-duplex link going the same distance, you are only getting 30Mbps. > Why is there a 50% loss when doing full-duplex? > > Also, are you testing with TCP or UDP? > > Travis > Microserv > > Matt Larsen - Lists wrote: >> OK, here are some real world examples: >> >> 5.3ghz 40mhz channel, 8.5 miles. WAR4/CM9 attached to 29db PacWireless >> Antennas. 50meg one way. >> 5.7ghz 20mhz channel, 10 miles. WAR2/CM9 attached to 29db PacWireless >> Antennas. 45meg one way (CPU maxes out on WAR2s) >> 5.7ghz 10mhz channel, 42 miles WAR4/SR5 attached to 34db Radiowaves >> Antennas. 18meg one way. >> FDD 5.2ghz 20mhz channel, 10 miles X4000/R52H attached to 29db >> Pacwireless/21db MTI panel. >> 5.8ghz 20mhz channel, 10 miles X4000/R52H attached to 21db >> MTI Panel/29db Pacwireless 30 down, 30 up >> >> for comparison: Motorola Gemini Lite (30meg bh) on the same link - 3meg >> down, 3 up >> >> We have several RB532 backhauls in the air, and even with all the >> optimization we can do to them, we never get better than 20 meg in one >> direction. Replacing the RB532s with WAR2s (266mhz CPU, comparable to >> an RB532) nearly doubles the speed. >> >> On comparable hardware, I have not come across ANY Mikrotik system that >> will keep up with StarOS when it comes to dedicated backhaul. >> >> Matt Larsen >> Inventive Media >> >> >> Mark Nash wrote: >> >>> 5.3GHz 40MHz channel, 1.5 miles. WAR4-METRO/SR5 inside 24dbi RooTennas. >>> Testing beyond each ethernet port. 2 weeks non-stop stress-testing after >>> we >>> installed and before we deployed gave us 70 megs one way. The MRTG graph >>> looked like a solid block without any deviation. >>> >>> Mark Nash >>> UnwiredWest >>> 78 Centennial Loop >>> Suite E >>> Eugene, OR 97401 >>> 541-998-5555 >>> 541-998-5599 fax >>> http://www.unwiredwest.com >>> ----- Original Message ----- >>> From: "Mac Dearman" <[EMAIL PROTECTED]> >>> To: "'WISPA General List'" <[email protected]> >>> Sent: Thursday, February 07, 2008 3:08 PM >>> Subject: Re: [WISPA] MT vs StarOS >>> >>> >>> >>> >>>> I haven't seen those results, but I have seen 12MbpsFDX with a -63 on both >>>> sides running Nstream2. If we are going to talk REAL THROUGHPUT - - lets >>>> get >>>> real and everyone use real figures. I ain't talking bench test and "maybe" >>>> if I hold one hand in the air, twist my lips standing on one leg. >>>> >>>> I mean real world - whatcha getting?? Whatcha see and is it a bench test >>>> or >>>> are you in the real WISP world? :) >>>> >>>> >>>> Mac >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>>> -----Original Message----- >>>>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On >>>>> Behalf Of Dennis Burgess - Link Techs Inc >>>>> Sent: Thursday, February 07, 2008 2:51 PM >>>>> To: 'WISPA General List' >>>>> Subject: Re: [WISPA] MT vs StarOS >>>>> >>>>> 50 both ways with N-Stream dual and Turbo mode... >>>>> >>>>> Dennis M. Burgess >>>>> Mikrotik Certified Consultant >>>>> Link Technologies, Inc., St. Louis, Missouri >>>>> --WISP/Network Support Services-- >>>>> +1 314-686-1302 >>>>> >>>>> >>>>> -----Original Message----- >>>>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On >>>>> Behalf Of Mike Hammett >>>>> Sent: Thursday, February 07, 2008 2:46 PM >>>>> To: WISPA General List >>>>> Subject: Re: [WISPA] MT vs StarOS >>>>> >>>>> Mikrotik can do 70 megs or more over 40 MHz as well. >>>>> >>>>> >>>>> ---------- >>>>> Mike Hammett >>>>> Intelligent Computing Solutions >>>>> http://www.ics-il.com >>>>> >>>>> >>>>> >> >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! 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