Re: Distance Objectives !!!!!
- To: BRIAN_LEMOFF@xxxxxxxxxxxxxxxxxxxxxxxxxx
- Subject: Re: Distance Objectives !!!!!
- From: Rich Taborek <rtaborek@xxxxxxxxxxxxxxxx>
- Date: Sun, 27 Jun 1999 02:22:03 -0700
- CC: stds-802-3-hssg-distance@xxxxxxxx
- Organization: Transcendata, Inc.
- References: <H00008250efff04d@MHS>
- Reply-To: rtaborek@xxxxxxxxxxxxxxxx
- Sender: owner-stds-802-3-hssg-distance@xxxxxxxxxxxxxxxxxx
Your are correct, what I am proposing is what should go into a standard.
However, the methodology we seem to be using is to pick a signaling proposal,
such as WWDM, and then setting as objectives the distances which can be
achieved with that signaling proposal. I'm opting for a far more impartial
scheme, one of specification of installed and new fiber performance characteristics,
and later adding distances based on one or more accepted signaling proposals.
If distances must be specified, I'd start with premises wiring standards:
100m, 550m and 2-3km, as we did for GbE.
Your suggestion sounds more like language that
would be included in a
specification within a standard, and less like
an objective, whose purpose
is to define the mission of and set the goals
for the group. Once we have
evaluated all of the available PMDs and how they
perform over all of the
available fibers, we will be in a position to
make a table like the one you
have included here. The question we need
to ask ourselves is "What should
we set as the minimum we are willing to settle
for in terms of distance and
fiber type". I feel that excluding support
for the installed base of MMF
from the objectives will allow us to settle for
a standard that falls short
of what our customers may be expecting.
I have no objection to adding
additional distances and fiber types into the
objectives, as long as we are
confident that we will be able to support them.
Here is an example that
includes some of Ed Cornejo's suggestions:
To define physical solutions to support distances
At least 100 m on multimode fiber
At least 250 m on multimode fiber, including the installed base
At least 2 km on single mode fiber
At least 10 km on single mode fiber
At least 50km on single mode fiber
I personally don't feel that all of these are
needed in the objectives
(particularly since the WWDM transceiver that
we have been working on
should support the first four cases in a cost-effective
manner), however if
this makes the objective more palatable to 75%
of the committee, I have no
problem with it at all. I do feel strongly that
support for installed MMF
should be included in the objective.
Richard Taborek Sr. Tel: 650 210 8800 x101 or 408
Fax: 650 940 1898 or 408 374 3645
1029 Corporation Way
Palo Alto, CA 94303-4305 Alt email: rtaborek@xxxxxxxxxxxxx