RE: [EFM] On cost benefit

["Bob Barrett" <bob.barrett@xxxxxxxxxxxxxxxxxx>]

Hans

Actually the sync out of E1s recovered from SDH is usually too poor to use
for a base station. Too much wander and jitter caused by the output PLL.
Take a look at an MTIE, then compare this to the PRC mask. The TDMoverEFM
specification that I would like to bring to 802.3ah can meet the PRC mask.

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 Hans
Mickelsson (ERA)
Sent: 25 January 2002 10:02
To: 'Bob Barrett'; O'Mahony, Barry; FEffenberger@xxxxxxxxxxxxxxxxx;
rabynum@xxxxxxxxxxxxxx; carlosal@xxxxxxxxxxxxxxxxxx; Chou, Joey; Thomas
Kallstenius (ERA)
Cc: stds-802-3-efm@ieee.org
Subject: RE: [EFM] On cost benefit



The support for synch will opening a new part of the access market, namely
the radio access networks that are used to connect base stations to higher
nodes. Today they rely on highly synchronous SONET/SDH links, therefore a
synchronous Ethernet link fulfilling the demands of SONET/SDH timing
requirements is necessary for these applications. Keep in mind that it is
strict legal demands on frequency stability radio antennas and this
stability relates to the accuracy of clocks in the fixed network (that, in
this case, will transported over Ethernet links).

	HANS

> -----Original Message-----
> From: Bob Barrett [mailto:bob.barrett@xxxxxxxxxxxxxxxxxx]
> Sent: den 25 januari 2002 06:56
> To: O'Mahony, Barry; FEffenberger@xxxxxxxxxxxxxxxxx;
> rabynum@xxxxxxxxxxxxxx; carlosal@xxxxxxxxxxxxxxxxxx; Chou, Joey
> Cc: stds-802-3-efm@ieee.org
> Subject: RE: [EFM] On cost benefit
>
>
>
> We have great voice quality on GSM, so long as the base
> stations are sync'd
> to stratum clocks for hand over. US digital is pretty good
> too. Charges are
> outrageous for rooming, but these service providers are our
> customers. What
> goes around comes around.
>
> Support for a sync mechanism in EFM could be a factor in
> success in these
> markets.
>
> Bob
>
> -----Original Message-----
> From: owner-stds-802-3-efm@majordomo.ieee.org
> [mailto:owner-stds-802-3-efm@majordomo.ieee.org]On Behalf Of O'Mahony,
> Barry
> Sent: 24 January 2002 21:41
> To: 'FEffenberger@xxxxxxxxxxxxxxxxx'; rabynum@xxxxxxxxxxxxxx;
> carlosal@xxxxxxxxxxxxxxxxxx; Chou, Joey
> Cc: stds-802-3-efm@ieee.org
> Subject: RE: [EFM] On the Worship of Speed
>
>
>
> Just to play devil's advocate here, the fastest growing segment of the
> telephony market, namely mobile telephony, apparently has
> little trouble
> selling in service to customers, despite long, "poor" latency.
>
> Of course the argument goes that the "advantage factor" of mobility
> counteracts the reduction on perceived voice qulaity in
> people's minds.
> Maybe so.  But I bring it up to point out that there is some
> quesiton, in
> some quarters, as to how well a test subject's responses in a
> MOS testing
> scenario correlate to what they're actually willing to pay for.
>
> ~~~~~~~~~~~~~~~~~~~~~~~
> Barry O'Mahony
> Intel Labs
> Hillsboro, OR, USA
> tel: +1 (503) 264-8579
> barry.omahony@xxxxxxxxx
> barry.omahony@xxxxxxxxxxxx
> ~~~~~~~~~~~~~~~~~~~~~~~
>
> -----Original Message-----
> From: FEffenberger@xxxxxxxxxxxxxxxxx
> [mailto:FEffenberger@xxxxxxxxxxxxxxxxx]
> Sent: Wednesday, January 23, 2002 8:06 PM
> To: rabynum@xxxxxxxxxxxxxx; FEffenberger@xxxxxxxxxxxxxxxxx;
> carlosal@xxxxxxxxxxxxxxxxxx; joey.chou@xxxxxxxxx
> Cc: stds-802-3-efm@ieee.org
> Subject: RE: [EFM] On the Worship of Speed
>
>
>
> DSL uses ATM.
>
> Also, DSL typically leaves the existing POTS service undisturbed,
> and is most often a data-only service.
>
> If you are talking of VoIP, then the answer to your question
> is "Poorly".
> The slop in the network is hidden by intensive processing on both ends
> of the network.  Echo-cancellers and error concealment.  And,
> of course,
> no guarantee of performance.  Of all people, I shouldn't have
> to convince
> you of the problems of trying to sell such a service to customers.
>
> Sincerely,
> Frank
>
> -----Original Message-----
> From: Roy Bynum [mailto:rabynum@xxxxxxxxxxxxxx]
> Sent: Wednesday, January 23, 2002 10:00 PM
> To: FEffenberger@xxxxxxxxxxxxxxxxx; carlosal@xxxxxxxxxxxxxxxxxx;
> joey.chou@xxxxxxxxx
> Cc: stds-802-3-efm@ieee.org
> Subject: Re: [EFM] On the Worship of Speed
>
>
>
> Frank,
>
> How does it work on 128kb DSL links with PPOE today?
>
> Thank you,
> Roy Bynum
>
> At 09:38 PM 1/23/2002 -0500, FEffenberger@xxxxxxxxxxxxxxxxx wrote:
>
>