Hi all,
I advice against using the VSI ports or adapter boards.
I guess we in Metsähovi are one of few places that have used them, had a
lot of timing and electrical problems (not on iBob or Roach).
Apparently the right twisted pair cable material was available in amounts
of tens of thousands of feet, there were some cables with wrong material
that mostly worked, we jury-rigged our own from loose twisted pair flat
cable and improved grounding.
What I really miss in the roach board is the footpad for 10GbE transceiver
cradle. Signalling is the same as for copper. RocketIO would be usable
too.
Cheers,
Jouko
"Life is pretty simple: You do some stuff. Most fails. Some works. You do
more of what works. If it works big, others quickly copy it. Then you do
something else. The trick is to do something else."
On Mon, 25 Jan 2010, Dan Werthimer wrote:
hi kris,
there's a samtec connector on the roach with 40 LVDS pairs.
you can buy a cable from samtec that connects two roaches together
using this connector. (i think it's a samtec "QSH" connector).
there's also a ZDOC to VSI connector board developed by
haystack observatory for VLBI. you can plug these boards into
roaches and then connect them together with a VSI cable.
best wishes,
dan
On 01/25/2010 06:55 AM, Kristian Zarb Adami wrote:
Dear all,
Has anyone tried connecting 2 ROACH-boards together over the Z-DOK
connectors? The reason I'm asking is that it would be useful for our
correlator project to get more bandwidth onto the ROACH boards and it
would be really useful for us if we could use the Z-DOK connectors for
communicating between ROACH boards.
thanks for any help
regards,
Kris
--
Dan Werthimer
Space Sciences Lab and Berkeley Wireless Research Center
University of Calfornia, Berkeley
