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Re: [RE] Lab proof of RES-E needs

Richard,
 
I have my doubts about the validity of simulations, with respect
to capturing worst-case events. I prefer mathematical and/or
conceptual proofs. Simulations are better at illustrating
things like bandwidth utilization under load, which is more
of a statistical measurement.
 
The problem with simulations is they are very rarely exactly
equal to the setup of your key customer and/or magazine reviewer.
The financial penalties for correcting the "oops" equipment
in the field, as well as the loss of reputation, can be severe
after these "oops" events.
 
DVJ

David V. James
3180 South Ct
Palo Alto, CA 94306
Home: +1.650.494.0926
      +1.650.856.9801
Cell: +1.650.954.6906
Fax:  +1.360.242.5508
Base: dvj@alum.mit.edu 

 

-----Original Message-----
From: owner-stds-802-3-re@IEEE.ORG [mailto:owner-stds-802-3-re@IEEE.ORG]On Behalf Of Richard Brand
Sent: Saturday, November 13, 2004 8:00 PM
To: STDS-802-3-RE@listserv.ieee.org
Subject: Re: [RE] Lab proof of RES-E needs

Glenn:
Can I commit to your proposal at the meeting next week?
Richard

"Algie, Glenn [CAR:0S00:EXCH]" wrote:

 

If enough doubt exists then how about we derive a Residential setup and drop some boxes into a residential lab of someone's and capture the performance numbers as well as see it subjectively.

Nortel may be able to offer something here. But we may not have all the pieces or test equipment.

Any interest?

-----Original Message-----
From: owner-stds-802-3-re@IEEE.ORG [mailto:owner-stds-802-3-re@IEEE.ORG] On Behalf Of Gross, Kevin
Sent: Friday, November 12, 2004 5:35 PM
To: STDS-802-3-RE@listserv.ieee.org
Subject: Re: [RE] Stream identification at the MAC SAP

I think it would be interesting to flesh out and analyze this use case.

-----Original Message-----
From: owner-stds-802-3-re@IEEE.ORG [mailto:owner-stds-802-3-re@IEEE.ORG] On Behalf Of Tuck, Fred
Sent: Friday, November 12, 2004 2:04 PM
To: STDS-802-3-RE@listserv.ieee.org
Subject: Re: [RE] Stream identification at the MAC SAP

I don't think that when you are potentially running several 20MB/s HD video streams over your network and then someone wants to copy a DVD sized file from one computer to another that over-provisioning is going to be up to the task.  You can always find a way to saturate the network.  I believe that we need both QoS and reservation.

Fred Tuck
EchoStar.

-----Original Message-----
From: Gross, Kevin [mailto:kevin.gross@CIRRUS.COM]
Sent: Friday, November 12, 2004 3:51 PM
To: STDS-802-3-RE@listserv.ieee.org
Subject: Re: [RE] Stream identification at the MAC SAP

I believe that adequate QoS on a home scale network can be achieved easily with layer 2 protocols and over-provisioning.

My arguments on this topic were not well received here.

-----Original Message-----
From: owner-stds-802-3-re@IEEE.ORG [mailto:owner-stds-802-3-re@IEEE.ORG] On Behalf Of Matt Squire
Sent: Thursday, November 11, 2004 8:04 PM
To: STDS-802-3-RE@listserv.ieee.org
Subject: Re: [RE] Stream identification at the MAC SAP

> Oddly enough, with Residential Ethernet (at least the way some of us
> have been envisioning it), you could really toss the PBX out the
> window without losing any quality of service.

Seems like people have already tossed the PBX out the window, and they're not having any problems.  So if that the benefit of RE, its a little late.

And all of those real-time and synchronized applications working great, and outside the scope of 802.  Which is (not coincidentally) one of my big questions about some of the work being investigated by this study group - why does 802 need to define isochronous services at all?

People have been running real-time and synchronized applications over Ethernet for a long time.  Timing issues are generally best addressed end-to-end at the application layer, and above L2.  Not everything has to be addressed within 802.3.

- Matt