Thanks, Dan and Matt- hearing that 3m is being used is enough for me. FWIW I'll be running these to CX4 modules on a Fujitsu XG0448 for most of the time. I'll take a shot at 3m.
Billy -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Matt Dexter Sent: Sunday, March 04, 2012 1:35 PM To: casper Subject: Re: [casper] Any cable length considerations for ROACH? Hi, most of my knowledge, such as it was, is probably obsolete by now. I haven't performed the tests to be able to say, one way or another, how the Roach1 nor Roach2 w/ long passive cable assemblies. Sorry - just haven't had the time. The longest passive cable I have in the lab is 3m. So I could set up at least a crude go/nogo test with those. For longer cables someone would have to provide the cable. But what are the two points of particular interest ? Roach1-a to/from Roach1-b ? Roach1 to/from commercial 10GbE switch (Fujitsu most likely) Roach1 to/from commercial 10GbE NIC from Myricom or Checksio or ... Roach1 to (only to) iBob or BEE2 or some legacy system ? same sort of idea for Roach2 w/ CX4 mezzanine card. Matt Dexter On Sun, 4 Mar 2012, Dan Werthimer wrote: > > hi billy, > info on copper and optical cables we've tested is at: > https://casper.berkeley.edu/wiki/Equipment_Cables > > virtex2 fpga's (ibob, bee2) do not meet 10GbeCX4 specifications, > but virtex5 fpga's (roach) does meet the 10GbeX4 spec, > so 5 meter CX4 cables should work. > > the longest cable we've used is 3 meters. > > if you want to go longer than 5 meters, there are several fiber optic cables > you can use, with optical transceivers built into the CX4 connectors. > > matt dexter is the expert here. > > best wishes, > > dan > > On Sun, Mar 4, 2012 at 9:07 AM, Barott, William Chauncey <[email protected]> > wrote: > > Hi all, > > > > Are there any cable length considerations for the ROACH? The BEE2s had > some limitations of not playing well > 2m copper CX4 cables (discussed > in > past threads). I can't find any threads on similar issues with the > ROACH - > does that mean there are none? What lengths are folks successfully > using > for copper XAUI and/or 10GbE? > > > > Billy > > > >
