Hi Matt,
I did some research about the fiber optic links some months ago.
It appears that the Fujitsu things are infiniband-only, they cannot be
connected to 10 Gbps Ethernet switches directly. Or more precicely, need
another such device to connect to a copper port.
I did try to convince the roach people to design a footprint for a
mainstream fiber optic transceiver, didn't succeed. As far as I know there
are about five 10GBE transceiver standards around, three of which have
same signals as CX4. So it would have been a zero-cost option, just add
some wires in the PCB.
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 Thu, 12 Jun 2008, Matt Dexter wrote:
Hi,
We are starting to run some tests with one of the Cognitive Radio group's
Fujitsu o-microGigaCN (o-MGC) fiber optic links. This unit is on
loan and will need to be returned in a bit.
This consists of:
Part number Serial number description
FPD-010R008-OE 01B-06160045 CX4/FO transceiver, 850nm VCSEL, 3.3V
FPD-010R008-OE 01A-05430042 CX4/FO transceiver, 850nm VCSEL, 3.3V
FOC-CC10004 50/125um MMF 850nm wavelength approx 50ft
optical interface is MPO connector
electrical interface is microGiGaCN
http://www.fujitsu.com/us/services/edevices/components/connectors/copper-modules
These units are reportedly quite expensive; maybe $1K per link
(2*$400+200).
Shortly I'll work on getting revised information but back in April of 2005
I was told:
Bob Thornton is the sales contact for the Fujitsu modules. His contact
information is:
Director of Marketing
Fujitsu Components America, Inc
bthorn...@fcai.fujitsu.com
408-745-4932
www.fcai.fujitsu.com
He will be receiving the first production modules in the next several
weeks. He estimates the prices to be:
module $350;
3m patch cord $90.
Lead time: 2-3 weeks.
The attachments were provided, back in 2005, by Fujitsu.
I haven't found them online.
Oren is running through some tests now. Additional results will be
distributed later. For now
iBob->iBob seems aok.
Connecting to the front of the BEE2s doesn't seem safe without
re-machining the lower edge of the BEE2 chassis' front opening. BWRC
folks designed this lower edge to be a "pinch bar" of sorts to help hold
the CX4 cable assemblies in place. The FO unit becomes taller sooner
than the WLGore CX4 cable assembly for example and thus the angle into
the BEE2's infiniband 4x connectors looks to be too steep. We didn't
try to force it in.
There is no "pinch bar" of any type in the back of the chassis so there
are no obstructions. Oren is trying those out now.
iBob-> back of BEE2 OK
back of BEE2 -> back of BEE2 OK
back of BEE2 -> iBob OK
Over the next few days we plan on testing more extensively.
Matt
------------------------------------------------------------------------
Date: Fri, 2 May 2008 11:53:41 -0400 (EDT)
From: John Ford <jf...@nrao.edu>
To: Matt Dexter <mdex...@berkeley.edu>
Cc: David MacMahon <dav...@astro.berkeley.edu>, casper@lists.berkeley.edu
Subject: Re: [casper] iBOB to iBOB over 15m CX4
On of the non-Casper BWRC groups has a box of the fiber optic cables
Dave mentions. We got the OK to borrow a couple to exercise them for
a few days. This is high priority on the to-do list.
Note as we as allowing longer distances the fiber optic cables
may be easier to route than the copper versions. Shorter radius of
curvature and smaller diameter.
Hi Matt. Could you post the vendor or other info on these cables? I'm
interested in using something similar.
Thanks.
John
