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
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@xxxxxxxxxxxx]
Sent: Tuesday,
August 22, 2006 1:24 AM
To:
STDS-802-3-HSSG@xxxxxxxxxxxxxxxxx
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
_____________________________
Drew Perkins
Chief Technology
Officer
Infinera Corporation
1322 Bordeaux
Drive
Sunnyvale, CA 94089
Phone:
408-572-5308
Cell:
408-666-1686
Fax:
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Email: dperkins@xxxxxxxxxxxx
WWW
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_____________________________
From: John
DAmbrosia [mailto:jdambrosia@xxxxxxxxxxxxxxxxxxx]
Sent:
Monday, August 21, 2006 9:38 PM
To:
STDS-802-3-HSSG@xxxxxxxxxxxxxxxxx
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