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Re: [HSSG] Reach Objectives



Petar,
 
I'd like to understand the breakpoints between volume and relative costs depending on the reach.  For example, if 50m reach satisfies 70% of the data center market and a proposed 50m solution could be 3x less expensive than a 100m solution, then a 50m target may be more appropriate.  That's why it is important to understand the reach distribution in the data center.  Knowing where the volume lies will permit the study group to target an objective (and hopefully a solution) that is optimal for that reach.
 
Thanks,
Brad


From: Petar Pepeljugoski [mailto:petarp@us.ibm.com]
Sent: Tuesday, August 22, 2006 10:30 AM
To: Brad Booth
Cc: STDS-802-3-HSSG@listserv.ieee.org
Subject: Re: [HSSG] Reach Objectives


In HPC and Datacenter environment one can often find (and needs) distances that are closer to 100m. Some of the optical solutions might have the same specs for 50m/100, particularly since we plan on using only OM3. Unless the line rate becomes much higher than 10 Gb/s, the difference in penalties and attentuation is minimal, so we should go with the optimal solution (cost/distance).

Regards,

Peter




Petar Pepeljugoski
IBM Research
P.O.Box 218 (mail)
1101 Kitchawan Road, Rte. 134 (shipping)
Yorktown Heights, NY 10598

e-mail: petarp@us.ibm.com
phone: (914)-945-3761
fax:        (914)-945-4134



Brad Booth <bbooth@QUAKETECH.COM>

08/22/2006 01:04 PM
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Brad Booth <bbooth@QUAKETECH.COM>

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Re: [HSSG] Reach Objectives





I agree with Geoff.  As mentioned, the 802.3an task force worked very hard to achieve the 100m reach.  The 10GBASE-T 100m reach was driven by the horizontal cabling specification, not what the typical deployment was in a data center.  
 
Cheers,
Brad


From: Geoff Thompson [mailto:gthompso@NORTEL.COM]
Sent:
Tuesday, August 22, 2006 8:55 AM
To:
STDS-802-3-HSSG@listserv.ieee.org
Subject:
Re: [HSSG] Reach Objectives


Roger-

At 03:47 AM 8/22/2006 , Roger Merel wrote:

Agree with Drew.  Have a few additional comments on other reachs:

For reach objectives, we should start with customer based needs (for broad market potential) and only amend if an obvious technical limitation with compelling economics can t readily meet the broad customer need.

Specifically:

- Long Reach probably should be set at 80km rather than 100km (as this is the common hut-to-hut amplifier spacing in telecom)

- While 50m does serve a useful portion of the market (smaller datacenters and/or the size of a large computer cluster), it is somewhat constraining as I ve been lead to understand that the reach needed in larger datacenters is continuing to out-grow the 100m meter definition but the 100m definition at least serves the customer well.  Certainly 10G-BaseT worked awfully hard to get to 100m (for Datacenter interconnect).


I wouldn't attach a lot of creedence to the 10GBASE-T goal for 100 meters. It was, I believe, mainly driven by the traditional distance in horizontal (i.e. wiring closet to desktop) distances rather than any thorough examination of data center requirements.

Geoff


- For both in-building reaches (50m & 300m; or 100m & 300m), the bigger issue which affects the PMD is the loss budget arising from the number of patch panels.  The shorter / datacenter reach should include a budget for 1 patch panel.  The longer / enterprise reach should include a budget for 2 patch panels (one in the datacenter and 1 in the remote switch closet).


From: Drew Perkins [mailto:dperkins@INFINERA.COM]
Sent:
Tuesday, August 22, 2006 1:24 AM
To:
STDS-802-3-HSSG@listserv.ieee.org
Subject:
Re: [HSSG] Reach Objectives




John,




I suggest dividing Metro into Metro Short Reach at 10 km (equivalent application to 10GBASE-LR) and Metro Intermediate Reach at 40 km (equivalent application to 10GBASE-ER).



Drew

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Drew Perkins


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From: John DAmbrosia [mailto:jdambrosia@FORCE10NETWORKS.COM]
Sent:
Monday, August 21, 2006 9:38 PM
To:
STDS-802-3-HSSG@listserv.ieee.org
Subject:
[HSSG] Reach Objectives




All,


We have had some conversation on the reflector regarding reach objectives.  Summarizing what has been discussed on the reflector I see the following



Reach Objectives


Long-Haul   --> 100+ km

Metro       --> 10+ km

Data Center --> 50m & 300m



Data Center Reach Segregation


Intra-rack

Inter-rack

Horizontal runs

Vertical risers



Use this data to identify a single low-cost solution that would address a couple of the reach objectives



Other Areas


During the course of the CFI there were individuals who wanted Backplane Applications kept in for consideration, but I have not heard any further input in this area.  Are there still individuals who wish to propose Backplane as an objective?



John