Hi Billy,
By in the lab I was trying to say I have a box of 3m cables sitting unused
on the floor. But I just checked... and the PAPER project is running
with 8 Roach1s each using 1 3m passive cable to send data to/from a
Fujistu 10GbE switch. I think the user data rates are 6.4 Gbps each way.
Matt
On Sun, 4 Mar 2012, Barott, William Chauncey wrote:
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
