RE: [EFM] EFM Requirements
Any active switch that serves multiple (business) subscribers is going to
need to be resilient. This needs to be reflected in the business case
comparisons.
I am not convinced that the raw fiber plant requirement for EPON is any
different to that for p2p in the real world. In dense areas there is logic
in co-locating splitters and fanning out the tail circuits. The only
difference is passive or active equipment at the 'hub'. Both topologies look
like physical stars. Note that a lot of real-world SONET / SDH rings also
look like physical stars too.
Can carriers comment on this please?
Bob
> -----Original Message-----
> From: owner-stds-802-3-efm@majordomo.ieee.org
> [mailto:owner-stds-802-3-efm@majordomo.ieee.org]On Behalf Of Sukanta
> ganguly
> Sent: 19 August 2001 17:06
> To: ramu_raskan@angelfire.com; stds-802-3-efm@ieee.org
> Subject: Re: [EFM] EFM Requirements
>
>
>
> Ramu,
> A all Fiber architecture will be simpler in the
> overall aspect but would be a extremely expensive
> deployment. So wo should have some sort of E/O deliver
> in the last/first half mile.
>
> Rich, Vladimir,
> An active architecture within the field isn general
> is not a good idea, but actual scenario may digress
> from generality. Some switching is required, no doubt.
> I haven't read any deeper discussion on the switching
> complexity (Maybe I missed some of the discussions in
> the past.) I also did not understand the assumption of
> the last/first 0.5 mile being more scalable than PON.
> What kind of scalability is required at the last/first
> mile. If you are talking about 1000baseX being
> distributed to the real consumer or to then the amount
> of bandwidth that is to be switched is fairly small
> (i.e. in comparison to the 10G portion). The switching
> components as far as scaleability and complexity is
> concerned will be very different and hence, atleast
> from my point of view is a very different discussion.
> I think, and you folks may help me understand it
> better, it is not a good idea to come up with a
> generic one switching logic which can be applied to
> 100base-X/1000base-X and 10G network.
> I would be extremely interested in discussing the
> active component network on different scale of
> operation as opposed to a PON as far as cost/ease of
> deployment and maintainence, complexity etc is
> concerned.
>
> My two cents.
>
> Thanx
> SG
> (Sukanta Ganguly, An independent view)
>
> --- ramu <ramu_raskan@xxxxxxxxxxxxx> wrote:
> >
> > Rich, not sure I understand the logic behind some of
> > your points, but the simple answer appears to be
> > that it requires new trenching for the new copper
> > drops, which will never fly. If I misunderstand,
> > please elaborate.
> >
> > I don't quite get you conclusion: 'since E/O is
> > required, 1KBaseX is significantly more cost
> > effective, scalable, and simpler than PON.'
> >
> > If E/O is required in the field it can't be PON.
> > Whether it is significantly more cost effective
> > cannot be judged without detailed designs of each.
> > Whether it is more scalable I guess depends on your
> > definition. Simpler is hard to imagine, but again
> > may depend on definition. If you could elaborate
> > your view I would be interested.
> >
> > Since you are suggesting an active architecture with
> > new electronics in the field, I for one would
> > welcome a discussion of such a network architecture
> > that had fiber for the last thousand feet. No one
> > has addressed that at all to my recollection. None
> > of the architectues is perfect in all respects so an
> > all-fiber active architecture undoubtedly has some
> > advantages.
> >
> >
> ==================================================================
> > Vladimir,
> >
> > It would seem that the most cost effective approach
> > for a 10 mile EFM
> > solution would be to use standard point-to-point
> > 1000BASE-X or 10GBASE-X
> > for the first 9.5 miles and then a 0.5 mile copper
> > tail for the
> > first/last half mile. Since E/O conversion is
> > required at the 9.5 mile
> > mark, standard 1000BASE-X or 10GBASE-X technology
> > would be significantly
> > more cost effective, scalable and simpler that PON
> > at that point. I
> > expect that there will be switching equipment
> > located at the upstream
> > (10 miles away) side, negating any benefit of a PON
> > split at that point.
> >
> > Please tell me what's wrong with this picture?
> >
> > P.S. I understand that this does not address the
> > rural market portrayed
> > by Frank Miller in this thread, but neither does
> > PON.
> >
> > --
> >
> > Best Regards,
> > Rich
> >
> >
> >
> > Get 250 color business cards for FREE!
> > http://businesscards.lycos.com/vp/fastpath/
> >
> >
>
>
> __________________________________________________
> Do You Yahoo!?
> Make international calls for as low as $.04/minute with Yahoo! Messenger
> http://phonecard.yahoo.com/