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RE: [10GBASE-T] Technical feasibility: power





Pat,

I seem to not remember things in my old age :-), but I can't remember
whether or not we've actually acheived 5W on a transceiver or not.  I agree
with you that this seems to be an goal that will eventually need to be met.

Cheers,
Clint Early, Jr.


                                                                                                                                                    
                      pat_thaler@agilent.com                                                                                                        
                      Sent by:                              To:       bradley.booth@intel.com, xichen@marvell.com, stds-802-3-10gbt@ieee.org        
                      owner-stds-802-3-10gbt@majordo        cc:       (bcc: Clint M Early/EHS/IPAPER)                                               
                      mo.ieee.org                           Subject:  RE: [10GBASE-T] Technical feasibility: power                                  
                                                                                                                                                    
                                                                                                                                                    
                      08/01/2003 12:44 PM                                                                                                           
                                                                                                                                                    
                                                                                                                                                    





Brad,

I'm pretty sure there wasn't an explicit power objective for GbE and 10GbE
though power was discussed in 1000BASE-T (I think mostly with regard to
whether it would be low enough to make putting the thing in a chip
feasible).

Needs change with time. For 1000BASE-T initial use in end nodes, one just
had to get it on a board with a gig MAC chip. I don't think there was any
doubt that if the power allowed you to get it into a chip you could put it
onto a board.

The thing that is different is that the 10 Gig server market wants more
than a MAC on the card. We are being asked to put TCP/IP Offload, RDMAP and
iSCSI protocol, and in some cases IPSec on the card. These burn a lot of
power too. That is why I think there should be a power objective when there
hasn't been one in the past.

Here's what I've gotten from the board specs:

PCI Express -
for a 4x or 8x card (this is the backplane bandwidth suitable for 10 Gig),
a standard height card is allowed 25 W, a low profile card is allowed 10 W.
The 25 W number assumes that sufficient cooling is provided by the system.

Infiniband -
for a standard single wide slot is 25 W.

Generally the systems vendors prefer that we stay under 15 W as a system
full of 25 W cards is a lot for them to handle.

If a 10GBASE-T transceiver was under 5 W or so, that would leave us power
for the other functions we need on the PCI Express standard height card and
on Inifiniband. That power level probably wouldn't enable low profile cards
with full offload functions.

Regards,
Pat

-----Original Message-----
From: Booth, Bradley [mailto:bradley.booth@intel.com]
Sent: Thursday, July 31, 2003 2:45 PM
To: xichen@marvell.com; stds-802-3-10gbt@ieee.org
Subject: Re: [10GBASE-T] Technical feasibility: power



I was trying to recall if 802.3 used and specific power numbers in the GbE
and 10GbE objectives or 5 criteria.  Considering I don't have web access
right now, I'm just going by memory.  I believe 802.3 did not dictate power
requirements, but did use power estimations in selection of the PHY to put
into the draft.  This is just a Study Group, so it may only be required
that to state that due consideration will be given to the power
requirements.

Thoughts?

Thanks,
Brad

-----------------
Sent from my BlackBerry.

-----Original Message-----
From: xichen@marvell.com <xichen@marvell.com>
To: stds-802-3-10gbt@ieee.org <stds-802-3-10gbt@ieee.org>
Sent: Thu Jul 31 13:52:04 2003
Subject: RE: [10GBASE-T] Technical feasibility: power


Burce,

That is what I called painful lessons.  The customers always want parts
that have high performance margin and low power.  I believe that has become
the rule for our designers unless you really want something that can also
fry eggs.  In order to give a reasonable estimation of the power
comsuption, we should defintely take into account all possible technology
and design tricks that we know and we can use in 5 years.  Of course, we
cannot predict any magic stuff that can save the world will come out soon,
but we can wait.

A well-estimated number will save a lot words.

Xiaopeng




             Bruce Tolley <btolley@cisco.com>


07/31/2003 12:56 PM

        To:        xichen@marvell.com, Bruce Tolley <btolley@cisco.com>
        cc:
        Subject:        RE: [10GBASE-T] Technical feasibility: power




Xiaopeng
Thanks for the response

The first 1000BASE-T parts were much more than a few watts. Also the power
numbers on the roadmaps of the various vendors started dropping as soon one
of the competitors achieved lower power numbers. All the sudden, the
impossible became possible.

And yes we need data to be presented in September.

Bruce

At 11:10 AM 7/31/2003 -0700, xichen@marvell.com wrote:

Hi,

I believe that everyone of us has painfully learned a lot from the history
of 1000BASE-T.  We have observed the power of a single 1000BASE-T dropped
from a few watts to sub-watt level today.   And we can pretty confidently
assess the impact of the technology that we are gonna use in 5 years and we
definitely should take that into account NOW.

Many circuit design experts will tell you that the power of digital circuit
part can be scaled down while the semiconductor technology got significant
improvement in the following years (how about using 65nm when 10GB-T reach
the market), but the analog circuit part won't get too much benefit from
that and its performance (for example, the ADC resolution) will be limited
by some fundamental physical rule.  Due to the complexity increase of the
DSP part and the analog part, even using 65nm technology for digital
circuit and using SiGe technology for analog circuit, to reach 100m on
CAT-7, the estimated power of the transceiver (assume it is practically
feasible) will be a number that can surprise you.  I believe more and more
data will be given in the following meeting to show you the reality.

Xiaopeng



Bruce Tolley <btolley@cisco.com>
Sent by: owner-stds-802-3-10gbt@majordomo.ieee.org

07/31/2003 10:12 AM

       To:        pat_thaler@agilent.com, yousefi@broadcom.com,
pat_thaler@agilent.com, btolley@cisco.com, bradley.booth@intel.com,
stds-802-3-10gbt@ieee.org
       cc:
       Subject:        RE: [10GBASE-T] September interim meeting


Pat

Thanks for providing detail on data centers. I would argue that in terms of
broad market potential, 10GBASE-T would pass muster even if the only market
application was data centers.

On the power issue, the first 1000BASE-T implementations did not appear
until well after the standard was done, some 5 years after the High Speed
Study Group got its PAR, and consumed an obscene about of power. We might
have never achieved the  low power 1000BASE-T PHYs we have today if we had
tried to agree on exact numbers in 1996.

Bruce

At 11:00 AM 7/31/2003 -0600, pat_thaler@agilent.com wrote:
Nariman,

CX4 is useful especially when we have in rack connections to make or ones
going to the next rack. However, the distance is too short for many other
data center connects. Also, the cable for the long distance is relatively
bulky which may be a problem for some uses. We will be glad to get it, but
it only solves a corner of the problem space.

Something for the longer distances in data centers that is lower cost than
fiber would be useful. For that environment, it doesn't necessarily have to
rely on already installed wiring. Running on existing wiring is nice, but
not essential.

My view of the important items for the data center environment:

It must perform solidly on the media we choose for it - data integrity
factors such as BER must be met.
It must be able to live on "standard" server bus adapter formats with a
TOE: e.g. PCI Express and Infiniband
  which means power is a concern
It must be transparent to existing MACs - that is, the MAC must see the
same behavior it sees with 10 Gig fiber.
100 m would be desireable (partly to enable future horizontal usage) but
the data center could live with shaving something off that. (100 m is nice
from a standards development standpoint as it saves us from arguing about
what lower number is enough.)
The media it runs over should not be so stiff or bulky that it is a problem
to accomodate with normal rack and data center cable management.
Of couse it must also meet EMI requirements

Regards,
Pat
-----Original Message-----
From: Nariman Yousefi [ <mailto:yousefi@broadcom.com>
mailto:yousefi@broadcom.com]
Sent: Wednesday, July 30, 2003 8:10 PM
To: pat_thaler@agilent.com; btolley@cisco.com; bradley.booth@intel.com;
stds-802-3-10gbt@ieee.org
Subject: RE: [10GBASE-T] September interim meeting

Pat,

I agree that the issues you raised must be addressed by November. One of
the biggest challenges for this group is to establish reality on technical
feasibility on Cat7, Cat6 and Cat5e channels.  Different vendors have
different conclusion on Technical feasibility. That is due to assumptions
on alien cross talk mitigation techniques, impact on implementation
impairments on SNR, channel model, coding gain, and analysis on chip
complexity in a given process. Assumptions must be stated clearly by
vendors that present technical feasibility. In this case, technical
feasibility drives the broad market potential.  Technical feasibility must
be addressed at least based on the following criteria:

1. Achievable distance on Class D channel with and without installation
mitigation techniques.
2. Achievable distance on Class E channel with and without installation
mitigation techniques.
3. Transceiver complexity in terms of estimated power dissipation and
realistic targets for building blocks like ADC, PLL and etc 2-3 years from
now.

We reached a conclusion that cat7 cable or class F channel has high enough
capacity for 10Gbps operation.  But, can a transceiver be built with
reasonable power dissipation and cost say in 90nm process or finer
geometries to achieve broad market potential?

We need to keep in mind that customers have fiber and CX4 as alternatives.

Nariman







At 01:08 PM 7/30/2003 -0600, pat_thaler@agilent.com wrote:
Bruce,

Generally, when the group can agree on clear objectives, then they can
finish the rest of the work. Fuzzy objectives often indicate a lack of real
concensus.

In November, I will also be expecting arguments that support the 5 criteria
based on the objectives -
especially:
Broad market potential - evidence that there will be a broad market the
minimum requirements of the objectives are met.

Technical feasibility - is it feasible to meet those minimum requirements

Economic feasibility - when you have met the minimum requirements will cost
be suitable to make it a viable product in the markets?

In the discussions at the plenary, a power consumption issue was raised by
some of the speakers.
If the broad market potential is based in part on use in devices such as
end nodes (including servers in data centers), then an objective for power
consumption such that this can reside in server card formats would be
important. Can it fit within the power constraints of a PCI Express board
and an Infiniband board (remembering that one has to allow some power for
the MAC and probably TOE/RDMAP engine)?

Looking at the objectifves in agenda_1_07_03, I don't see any that address
power consumption or the abilitiy to live on server card formats. In a
quick search, I also didn't find any material on power consumption in the
presentations that have been made to the study group. I hope that in
September the group will address the issue of power.

Regards,
Pat
-----Original Message-----
From: Bruce Tolley [ <mailto:btolley@cisco.com> mailto:btolley@cisco.com]
Sent: Monday, July 28, 2003 1:22 PM
To: Booth, Bradley; stds-802-3-10gbt@ieee.org
Subject: Re: [10GBASE-T] September interim meeting

Brad:

Thanks for the follow up.

I am confident that if we can agree on crisp, clear objectives for 10 Gbps
reach and media supported in September that we can get our PAR approved and
move into Task Force mode, which is where the real work begins.

Bruce

At 06:35 PM 7/24/2003 -0700, Booth, Bradley wrote:

Study Group Members,

Just to let others that were not at the meeting know the outcome of the
802.3 Working Group meeting, the Study Group will have to complete its PAR,
5 Criteria and Objectives in November.  This gives the Study Group the task
of completing the PAR, 5 Criteria and Objectives in 4 months.  This will
make our September Interim meeting extremely important.  We will need to
complete the effort as much as possible to pre-submit to the 802.3 Working
Group prior to the November Plenary.  November will permit us the ability
to modify the PAR, 5 Criteria and Objectives prior to asking 802.3 to put
the PAR on the NesCom agenda.  The September Interim meeting will focus on
the completion of our PAR, 5 Criteria and Objectives.
Thanks,
Brad

Chair, 10GBASE-T Study Group


Bruce Tolley
Senior Manager, Emerging Technologies
Gigabit Systems Business Unit
Cisco Systems
170 West Tasman Drive
MS SJ B2
San Jose, CA 95134-1706
internet: btolley@cisco.com
ip phone: 408-526-4534
"Don't put your hiking boots in the oven unless you plan on eating them."

Colin Fletcher, The Complete Walker



Nariman Yousefi
Vice President Networking Engineering

PH  (949) 585 5450
FAX (949) 453 1848
e-mail : Yousefi@Broadcom.com


Bruce Tolley Senior Manager, Emerging Technologies Gigabit Systems Business
Unit Cisco Systems 170 West Tasman Drive MS SJ B2 San Jose, CA 95134-1706
internet: btolley@cisco.com ip phone: 408-526-4534
"Don't put your hiking boots in the oven unless you plan on eating them."
Colin Fletcher, The Complete Walker


Bruce Tolley Senior Manager, Emerging Technologies Gigabit Systems Business
Unit Cisco Systems 170 West Tasman Drive MS SJ B2 San Jose, CA 95134-1706
internet: btolley@cisco.com ip phone: 408-526-4534
"Don't put your hiking boots in the oven unless you plan on eating them."
Colin Fletcher, The Complete Walker