Re: [EFM] TDM circuit emulation
Kent:
There already exists an IEEE802 standard with a PHY under a 802.3 MAC that
supports both 802.3 packets and real, not virtual TDM services. That is
802.9a. However as it was vintage '94, it is a copper only standard and at 10
Mb/sec.
Richard Brand
kmccammon@xxxxxxxxxxx wrote:
> Bruce and all,
> SBC does consider that next generation fiber access solutions should support
> TDM such as T1 and voice services. If TDM services must be done on a
> separate wavelength and not with the PHY below 802.3 MAC, the EFM optics
> group should pick a wavelength plan that can support wavelength evolution.
> -Kent
>
> Kent G. McCammon
> Access and Video Technologies
> SBC Technology Resources, Inc
> 4698 Willow Road
> Pleasanton, CA 94588
> 925-598-1246
> kmccammon@xxxxxxxxxxx
> This e-mail and any files transmitted with it are the property of SBC, are
> confidential, and are intended solely for the use of the individual or
> entity to whom this e-mail is addressed. If you are not one of the named
> recipient(s) or otherwise have reason to believe that you have received this
> message in error, please notify the sender at 925-598-1246 and delete this
> message immediately from your computer. Any other use, retention,
> dissemination, forwarding, printing, or copying of this e-mail is strictly
> prohibited.
>
> > -----Original Message-----
> > From: Bruce Tolley [mailto:btolley@xxxxxxxxx]
> > Sent: Sunday, December 09, 2001 6:19 PM
> > To: bob.barrett@xxxxxxxxxxxxxxxxxx; stds-802-3-efm@xxxxxxxxxxxxxxxxxx
> > Subject: RE: [EFM] TDM circuit emulation
> >
> >
> >
> >
> > Bob:
> > I would welcome a presentation on this topic.
> >
> > If there is serious interest in supporting this application,
> > while I think
> > support for it is clearly outside the scope of the project,
> > one approach
> > would not be to define a PHY to support it but to leave wavelengths
> > available so we do not break the ability of other implementations to
> > support it.
> >
> > Bruce Tolley
> > Cisco Systems
> >
> > At 10:03 PM 12/9/2001 +0000, Bob Barrett wrote:
> >
> > >Jangrai
> > >
> > >I am interested in TDM over EFM and over IP, however, so far
> > EFM has ruled
> > >TDM as out of scope or implementation specific.
> > >
> > >It is one thing to run TDM in packets, it is actually easier
> > to run TDM in
> > >side bands, but that would mean changing the PHY. I was going to do a
> > >presentation on this in Portland but I pulled it because
> > there appeared to
> > >be zero chance of changing the PHY at that point. If the
> > group adopts OAM
> > >other than in frames the PHY will need to be changed, and at
> > that time
> > >Pandora's Box will be open, so to speak, and I will come
> > back in with my
> > >presentations. May as well be hung for a sheep as a lamb.
> > I.E. if we are
> > >changing the PHY for OAM we may as well change it to add
> > side band TDM.
> > >
> > >In all packet networks circuit emulation as frames or IP is
> > needed in the
> > >metro / back-haul. Side band TDM won't cut it.
> > >
> > >In traditional networks circuits can be done as they are
> > today, or at worst
> > >they need to be carried in the last mile / first mile along
> > side the packet
> > >traffic, to where the SONET / SDH metro handles them in the
> > back-haul.
> > >
> > >I have technology for both that I would be willing to
> > contribute to EFM if
> > >the group were to feel that that was a desirable enhancement
> > to the EFM
> > >specification.
> > >
> > >There is certainly new silicon for EPON, probably for
> > outside plant 1GE, and
> > >probably for 10Base4 copper. However, I see the
> > applicability being EPON and
> > >1GE only, unless there is a benefit in changing the T1/E1
> > from its current
> > >copper coding to something else to reduce cross-talk on the
> > copper PHY.
> > >
> > >Hugh / Howard - any comment on this from the copper track please?
> > >
> > >Best regards
> > >
> > >Bob
> > >
> > > > -----Original Message-----
> > > > From: owner-stds-802-3-efm@majordomo.ieee.org
> > > > [mailto:owner-stds-802-3-efm@majordomo.ieee.org]On Behalf Of ???
> > > > Sent: 09 December 2001 15:39
> > > > To: stds-802-3-efm@xxxxxxxxxxxxxxxxxx
> > > > Subject: [EFM] TDM circuit emulation
> > > >
> > > >
> > > >
> > > > Hello,
> > > >
> > > > What do you think of T1/E1 and T3/E3 circuit emulation over EFM?
> > > > Some vendors have announced TDM integration over IP.
> > > > It might be some problematic in cost/performance due to cost of
> > > > delay/jitter compensation. And how about supporting resiliency?
> > > >
> > > > Jangrai Roh
> >
begin:vcard
n:Brand;Richard C.
tel;work:408 495 2462
x-mozilla-html:FALSE
org:Advanced Technology Investments;Nortel Networks (408) 495 2462
adr:;;;;;;
version:2.1
email;internet:rbrand@xxxxxxxxxxxxxxxxxx
title:Director, Network Architecture & Applications
fn:Richard C. Brand
end:vcard