Re: SJTP: Minutes from 08-May meeting
While it is easy to charaterize a laser using DC current, an Ethernet box is
currently not capable of transmitting DC and therefore requires a different test
signal if this measurement is to be made after the laser is in a system. When
testing at the system level, it is desireable to make as many of the
measurements as possible with the fewest number of test signals since the
Ethernet equipment rather than the test equipment must generate the test
patterns. The jitter pattern group is trying to minimize the number of test
patterns and is currently proposing only two ( the randomlike jitter pattern and
a square wave). If the encircled flux measurement "can" be made under modulation
it simplifies the standard. It also stands to reason that a modulated
measurement would be a more accurate indicator of link perfromance but I don't
know if data exists to support this.
"Hackert, Michael J" wrote:
> Ben,
>
> Hi. Having only scanned minutes, I hate to sound ignorant. However, I was
> wondering if there was really a need to have the source modulated during the
> encircled flux measurements as implied in your slide 3.
>
> TIA 2.2.1 never did any experimentation with modulation of the transceivers
> during our development process. I have done some tests myself which says
> that the difference if any is hard to detect. Not being a manufacturer of
> transceivers and lacking that expertise, I will concede if the experts say
> that it is necessary. However, I am reluctant to add a requirement if it is
> really only being included as a nice to have.
>
> mike
>
> > Mike Hackert
> >
> > Measurement Project Engineer
> > Corning Incorporated, SP-BN, Corning, New York 14831
> > telephone: (607) 974-3063 (fax: 5983)
> > mailto:HACKERTMJ@xxxxxxxxxxx
> >
> >
> > ----------
> > From: Ben Brown[SMTP:bbrown@xxxxxxxx]
> > Sent: Tuesday, May 08, 2001 4:19 PM
> > To: serialpmd
> > Subject: SJTP: Minutes from 08-May meeting
> >
> > <<File: minutes_010508.txt>><<File: SJTP_update_010508.ppt>>
> >
> > All,
> >
> > Thanks for your participation. Attached are the minutes from
> > today's conference call. Also, attached is an updated copy of
> > the presentation. Please review before Thursday evening as I
> > intend to make it available to the task force at that time.
> >
> > Thanks,
> > Ben
> >
> > --
> > -----------------------------------------
> > Benjamin Brown
> > AMCC
> > 2 Commerce Park West
> > Suite 104
> > Bedford NH 03110
> > 603-641-9837 - Work
> > 603-491-0296 - Cell
> > 603-626-7455 - Fax
> > 603-798-4115 - Home Office
> > bbrown@xxxxxxxx
> > -----------------------------------------
> >