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@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: 408-904-4644
Email:
dperkins@xxxxxxxxxxxx
WWW :
http://www.infinera.com
_____________________________
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