[SI-LIST] Re: FW: Copper interface cable proposal

Look into the Tek CSA8000 or TDS8000 which come with different Sampling
Modules if considering the Tek 11801.

Rich

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Tegan Campbell
Sent: Tuesday, August 28, 2001 12:46 PM
To: Signal Integrity (E-mail)
Subject: [SI-LIST] FW: Copper interface cable proposal



Hi everybody,
I'm new to the SI list(I'd like to thank Mike for telling me about it)
and have a measurement question.  The gist of the following exchange is
that I'm doing a 2Gb Fibre Channel design and need a scope to verify
signal integrity.
I was looking at the 4GHz Tek 7404, but I realize it will only be able
to capture the fundamental 2G freq.  The first question is, Has anyone
been able to look at a Fourier Transform out of the new SFP modules for
Fibre Channel?  I'm wondering how closely they come to replicating an
ideal square wave(energy at the fundamental, then have to worry about
the odd harmonics).  If there is significant energy there, I won't be
able to use the 7404.
A scope Mike recommended is the Tek 11801.  The only thing I don't like
about it is it's limited use for a high price(no single shot capability,
unless I'm reading the data sheet wrong).
Any experiences you have had with particular scopes in this freq range
would also be appreciated.
Also, please tell me if this is not a good question for this list.  I
don't want to be "that guy".
Thanks,
Tegan Campbell
Elec Eng
Quantum Corp


-----Original Message-----
From: Mike Jenkins [mailto:jenkins@xxxxxxxx]
Sent: Wednesday, August 22, 2001 6:15 PM
To: Tegan Campbell
Subject: Re: Copper interface cable proposal


Mr. Campbell,

Sorry to be so late with a reply.  The scope I used is a
Tektronix 11801B or 11801C with SD-24 sampling heads.  The
scope body, I think, is about $25-30K, but the sampling heads
are maybe $5K each (for two channels).  But please check the
TEK catalog.

This is one of the scopes used typically for Fibre Channel
applications.  Agilent also has appropriate scopes, but I
don't know anything about them.

Lastly, I'm not sure what location/division you're in, but
Quantum's division in Shrewsbury(?), Massachusetts was in the
Fibre Channel business, but backed out a while ago.  They
might have some good equipment just sitting around now.

Good luck,
Mike

ps: If you want further opinions, you might try posting your
    question to the signal integrity reflector
    (si-list@xxxxxxxxxxxxx or subscribe with a note to
    si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the
    subject field)

>
> Mr Jenkins,
> I am in the beginnings of a fibre channel design and need a scope that
> is capable of capturing signals in the 2Gbps range.  I saw the scope
> traces in the paper you authored on the T11 site, and was wondering
what
> kind of scope you are using.  If it is not commercially
> available(read:if it's over 100K) could you suggest a scope that would
> do the job for 2Gb fibre?  I am currently leaning toward the 4GHz
> Tek(the 7404 I believe).
> Any hints or things to look out/look for would be appreciated.
> Thank you for your time.
> Tegan Campbell
> Elec Eng
> Quantum Corp
> (720)406-5665

--
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 1525 McCarthy Blvd.       mailto:Jenkins@xxxxxxxx        |     |
 Milpitas, CA  95035         http://www.lsilogic.com      |_____|
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