Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

Re: [EFM] TDM circuit emulation



Not as a big surprise BellSouth also agrees.

B.F.

At 12:25 PM 12/12/01 -0700, Charles Cook wrote:
>
>Qwest concurs with SBC.
>
>Charles
>
>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
>> >
>


Brian Ford
BellSouth Telecommunications
Science and Technology
SMTS - Exploratory Development
ford_b@xxxxxxxxxxxxxxxxx
Phone +1 (404) 332-2217
FAX +1 (404) 529-8025