> just as Dan says larger gauge cables are definitely recommended > for longer runs. The exact mapping of xx AWG to NN meters > may be ill defined. not just set by COTS switch but also > when the Roach2 and SFP+ Mezzanine card are included in the mix. >
We've had one particular brand of cables of ~1 meter length that has not worked well for us. I can't remember it offhand. Jason, can you remember which brand was lame? John >>From the FCI and Molex data sheets : > > FCI product family > 10110818020xxLF : XX is length from 0.5 to 4.0meters : all 30 AWG > 10110818030xxLF : XX is length from 0.5 to 5.0meters : all 28 AWG > 10110818040xxLF : XX is length from 0.5 to 7.0meters : all 26 AWG > 10110818050xxLF : XX is length from 0.5 to 10.0meters : all 24 AWG > use HFLF if need halogen free > > Molex product family > 747520xxx : xxx is length from 0.3 to 5.0 meters : all 32 AWG > 747521xxx : xxx is length from 0.3 to 10.0 meters : all 30 AWG > 747522xxx : xxx is length from 0.3 to 15.0 meters : all 28 AWG > 747523xxx : xxx is length from 0.5 to 10.0 meters : all 26 AWG > 747524xxx : xxx is length from 0.5 to 15.0 meters : all 24 AWG > most longer lengths above 6.0 meters require system preemphasis > and/or equalization. > > last time I looked I had more trouble finding a 1m cable with 28AWG > relative to the 30AWG version. > > PAPER hopes to start lab testing of bunches of 3m 30 AWG FCI cables > next week. > > > > On Thu, 25 Jul 2013, Dan Werthimer wrote: > >> Date: Thu, 25 Jul 2013 13:07:29 -0700 >> From: Dan Werthimer <[email protected]> >> To: "Gary, Dale E." <[email protected]> >> Cc: casper list <[email protected]> >> Subject: Re: [casper] SFP+ Cables >> >> >> hi dale, >> we've had good luck with copper SFP+ cables. >> >> we've tested 1, 2 and 3 meter copper cables, >> from mellanox, amphenol and the FCI cables >> that matt discusses below. >> >> for 1 meter, any gauge will work, but for long >> copper cables, i'm told that thicker gauge wires are >> more reliable. SFP+ cables are available with >> 32,30,28,26 gauge wires. we've been using 30 and 28 >> gauge. i'd stay away from 32 gauge for long cables. >> >> each switch manufacturer has a list of cables that >> they have tested on their switch and they promise >> those will work. >> so far all the cables we've purchased work fine on the various >> switches we have, including the dell 8024F. >> >> we've also had good luck with optical transceivers for SFP+. >> you can get these transceivers for long runs, up to 40km fiber links. >> the 10 and 40 km transceivers than the short run transceivers. >> you can also purchase dwdm and cwdm tranceivers with different >> color lasers so you can put up to about 100 10Gbit links on a fiber. >> >> best wishes, >> >> dan >> >> On Thu, Jul 25, 2013 at 10:27 AM, Matt Dexter <[email protected]> >> wrote: >> Hi Dale, >> >> >> I have very little experience with SFP+ cables but have no >> plans to use active fiber optic links for my 1 to 3meter cable >> runs. >> >> I've started to learn about such things as these passive copper >> 3meter cables >> FCI China, 10110818-2030LF >> >> http://www.digikey.com/product-detail/en/10110818-2030LF/609-3977-ND/233349 >> 5 >> price at 50 units is $23.06160 312 in stock on 2013jul25 >> Digikey also has >> a) FCI 78 0.5m long versions at $20.22 @ qty 50 (july 15) >> b) FCI 30 5m long 28 awg at $27.5626 @ qty 50 (july 15) >> >> other searches I've used >> http://components.arrow.com/part/search/sfp+/%5E4/79/944?in_stock=on >> >> http://www.mouser.com/Wire-Cable/Cable-Assemblies/ >> filter based on SFP+, 1..3 meters >> 11 matches if select stocked >> FCI 10110818-2030LF 3m < $27 qty 50 (2013jul15 12 in stock) >> Molex 74752-2301 3m < $36 qty 50 (2013jul15 13 in stock) >> TE connectivity/AMP 3m 30 AWG $44 qty 50 (2013jul15 16 in >> stock) >> TE connectivity/AMP 3m 24 AWG < $43 qty 50 (2013jul15 4 in >> stock) >> >> I can't recall the details but weren't there some reports of >> issues with some particular >> brand of "short", maybe less than 1m, cables ? >> >> HTH, >> Matt >> >> >> On Thu, 25 Jul 2013, Gary, Dale E. wrote: >> >> Date: Thu, 25 Jul 2013 17:10:52 +0000 >> From: "Gary, Dale E." <[email protected]> >> To: casper list <[email protected]> >> Subject: [casper] SFP+ Cables >> >> Hi All, >> >> I need to order the cables for connecting our ROACH2 >> SFP+ mezzanine cards to >> a 10GBE swtich. We need only 1 m cables. I find >> some rather cheap "passive >> copper" >> cables(e.g.http://www.cablesondemand.com/pcategory/91/category/SFP%2B+CBL/URvars/ >> Catal >> og/Library/InfoManage/SFP+_CABLES_%28DIRECT_ATTACH%29.htm?gclid=CMSTkrqNy7g >> >> CFYdxQgodhnkAuw), but will these work, or do I need >> optical cables with >> tranceivers on each end? Seems overkill for 1 m! >> The 10 GBe switch is not >> yet defined, but I am looking for surplus Dell 8024F >> switches recommended by >> Dan W. >> >> Thanks, >> Dale >> >> >> >>
