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RE: [EFM][EFM-P2P] 100Mbps P2P over SMF

Dave, you are bringing up several of the important issues in dense, short distance topologies; I think that's good and clearly needed for EFM to become the overall success we all anticipate.
A detail we may need to take care of; if we are considering for EFM to make use of an existing 802.3 100Mbps PMD, we need to find out how EFM OAM can be put into it (or on top of it).

In my opinion, we should also think of 100Mbps P2P in sparse topologies, and how it would satisfy [fairly] long home runs. Ideally, we should gather the required data & cost estimates etc., to calculate what this suggested new PMD can do in just about any network scenario.

Ingvar Froroth

> -----Original Message-----
> From: Horne, David M [mailto:david.m.horne@xxxxxxxxx]
> Sent: Wednesday, November 21, 2001 4:37 PM
> To: 'Ulf Jönsson F (ERA)';;
> stds-802-3-efm-p2p@xxxxxxxxxxxxxxxxxx
> Subject: RE: [EFM][EFM-P2P] 100Mbps P2P over SMF
> Hi Ulf, I would be interested in 100M, particularly in the 
> context of the
> local legs of active architectures and the HALF-PON 
> architecture I brought
> up a while back 
> ( ).
> It has some similarities to your recent presentation at:
> 1_1101.pdf
> We will run into the same multiple-distance-support questions 
> as 1G P2P.
> 100M seems most interesting to me--in the context of an active
> architecture--with a long distribution fiber at 1G, and short 
> feeders on the
> local legs to each ONU at 100M (or, 1G broadcast-and-select passive
> downstream, and 100M upstream to an active node for 
> HALF-PON). How short is
> short, is the question. Maybe 300m; maybe 500m; maybe 1-2km. 
> Inexpensive is
> key. The INTENT should be to serve short feeders in this 
> range, rather than
> trying to be all things to all people. The distance extension 
> premium may be
> too high to justify the cost per user of the longer distance 
> capability as
> an umbrella solution. 
> If the network layout needs longer multi-km feeders, a different
> architecture (or proprietary distance-extended 100M) would be 
> used. 300m
> serves a high percentage of medium- to high-density 
> residential applications
> at 16:1 aggregation. Possibly (haven't run any numbers on 
> this) 64:1 fits
> with 1km. If the cost to increase from 300m to 1km is only a 
> few bucks per
> user, then it makes sense for 1km to be the goal. If it 
> costs, say, 30 bucks
> to go from 300m to 1-2km capability, it will be hard to 
> justify anything but
> 2 separate specs. 30 bucks times zillions of users is a lot 
> of Cap-ex that
> goes wasted for a network operator whose layout logistics 
> dictate deployment
> at 16:1 / 300m, but has to pay the premium for the 
> capabilities to reach 1km
> because the spec says so. Compare the costs of 100BaseSX 
> versus 100BaseFX,
> for example (which is much greater than 30 bucks).
> However, these are all points that would be addressed, and no doubt
> resolved, AFTER the general concept of 100Mbps P2P is 
> approved. I am in
> favor of the general concept, and believe it meets the 5 
> criteria using the
> same arguments as the current set of P2P and P2MP. 
> Architecturally, active
> topologies were left out of EFM for some reason. They are a natural
> complement to the current set of supported architectures, and 
> should be
> included. 
> --Dave Horne
> -----Original Message-----
> From: Ulf Jönsson F (ERA) [mailto:Ulf.F.Jonsson@xxxxxxxxxxxxxxx]
> Sent: Tuesday, November 20, 2001 5:54 AM
> To:;
> Subject: [EFM][EFM-P2P] 100Mbps P2P over SMF
> Hi all,
> On the January meeting we will make a presentation on the 5 
> criteria for
> 100Mbps P2P over SMF. Many of you have already indicated your 
> interest and
> in order to have a broad acceptance of the proposal we invite 
> all of you who
> would like to support, contribute or participate in this 
> presentation. 
> Please respond to me if you are interested. We intend to have 
> a first draft
> presentation during next week that we can discuss off-line. 
> Best regards,
> Ulf Jönsson
> Ericsson
> +46 70 2673313