Re: [802.3BA] 5 Criteria mod to support 40 G on SMF
Hong,
Good point. Most data that I'd previously seen presented for Gigabit
Ethernet and 10 Gigabit Ethernet indicated that the 1-2 km range
satisfied the campus network environment. The 2 km and 10 km reaches in
10 Gigabit Ethernet were intended to satisfy the campus and metro
networks, respectively. If, as you suggest, this is to target the
server and computing applications, then the campus (1-2 km) reach would
be a better target.
In my humble opinion, the focus being presented is to go beyond the
server and computing environment. HSSG took a year to formulate its
objectives and 5 criteria, and 40G 10km SMF was passed over. While it
is the right of the task force to re-consider, there is also a price to
be paid in the impact to the project. It is a bit concerning to see the
objectives and 5 criteria requiring changes as the task force needs to
start to selecting proposals to form a baseline draft.
Is 40G starting to show feature creep?
Thanks,
Brad
-----Original Message-----
From: Hong Liu [mailto:hongliu@GOOGLE.COM]
Sent: Thursday, February 07, 2008 5:53 PM
To: STDS-802-3-HSSG@LISTSERV.IEEE.ORG
Subject: Re: [802.3BA] 5 Criteria mod to support 40 G on SMF
Before we dive into the power budget and spreadsheet, we should probably
investigate the best balance of reach and cost for 40Gb/s SMF for server
market and computing applications.
Economically, it probably doesn't make sense to do 40Gb/s SMF at 10km
for server and computing. 1km~2km should be more than sufficient.
Hong Liu
Google Inc.
-----Original Message-----
From: Howard Frazier [mailto:hfrazier@BROADCOM.COM]
Sent: Thursday, February 07, 2008 3:21 PM
To: STDS-802-3-HSSG@LISTSERV.IEEE.ORG
Subject: [802.3BA] 5 Criteria mod to support 40 G on SMF
Dear members of the IEEE 802.3ba Task Force,
I have reviewed our approved set of 5 Criteria responses
http://www.ieee802.org/3/ba/PAR/HSSG_5C_0707.pdf
looking for any material that will need to be changed in the event we
adopt an objective to support 40 Gb/s operation on 10 km of single mode
fiber. In my opinion, the responses will remain valid and complete, with
one exception.
On page 6 of the above referenced file, in our response to the Economic
Feasibility criterion, we state:
Presentations indicate that for the server market and
computing applications the optimized rate to provide
the best balance of performance and cost is 40 Gb/s.
For the network aggregation market and core networking
applications, the optimized rate offering the best
balance of performance and cost is 100 Gb/s.
If we adopt a 40 Gb/s SMF objective, then this response should be
modified along the lines of:
Presentations indicate that for the server market,
computing applications and some cost-sensitive
aggregation applications, the optimized rate to provide
the best balance of performance and cost is 40 Gb/s.
For the network aggregation market and core networking
applications, the optimized rate offering the best
balance of performance and cost is 100 Gb/s.
The change being the insertion of the words "some cost-sensitive
aggregation applications" in the first sentence.
I think that our previously approved responses for Broad Market
Potential, Compatibility, Distinct Identity, and Technical Feasibility
will not require any change in the event that we adopt an objective for
40 Gb/s operation on SMF. I think that the proponents of the new
objective will be able to readily demonstrate this.
If you think I have over looked something else that might need to be
changed, please speak up, and please provide a proposed change.
Howard Frazier
Broadcom Corporation