RE: [RPRWG] 802.17 Outline: Stratum Clock distribution?
James,
> Stratum Clock Distribution to me means ANSI T1.101
> Synchronization hierarchy standard.
> This is very different to time-of-day clocks.
Please clarify why these are very different. I had thought
that synchronized time-of-day clocks (when sufficiently
accurate) is a superset of Stratum Clock distribution.
DVJ
David V. James, PhD
Chief Architect
Network Processing Solutions
Data Communications Division
Cypress Semiconductor
110 Nortech Parkway
San Jose, CA 95134
Work: +1.408.942.2010
Cell: +1.650.954.6906
Fax: +1.408.942.2099
Work: djz@xxxxxxxxxxx
Base: dvj@xxxxxxxxxxxx
> -----Original Message-----
> From: Chan, James [mailto:jchan@xxxxxxxxxxxxxxxxx]
> Sent: Wednesday, November 21, 2001 1:33 PM
> To: 'djz@xxxxxxxxxxx'; Jeanne.De_Jaegher@xxxxxxxxxx
> Cc: stds-802-17@xxxxxxxx
> Subject: RE: [RPRWG] 802.17 Outline: Stratum Clock distribution?
>
>
>
> Stratum Clock Distribution to me means ANSI T1.101
> Synchronization hierarchy
> standard. This is very different to time-of-day clocks. Synchronization is
> necessary from PSTN (TDM voice) perspective. It may also be required for a
> RPR network supporting circuit emulation services (there may be other ways
> to do it without synchronization). However, this is an implementation
> specific issue which should not be part of the RPR standard. Individual
> vendors may choose to do it as their differentiator.
>
> I was not aware of stratum clock discussion in the last meeting. Can any
> else shed some light?
>
>
> Regards,
>
> James Chan
>
>
>
>
> -----Original Message-----
> From: David James [mailto:djz@xxxxxxxxxxx]
> Sent: Wednesday, November 21, 2001 10:14 AM
> To: Jeanne.De_Jaegher@xxxxxxxxxx
> Cc: stds-802-17@xxxxxxxx
> Subject: RE: [RPRWG] 802.17 Outline: Stratum Clock distribution?
>
>
>
> Jeanne,
>
> Some physical layers have no provisions for accurately
> synchronizing time-of-day clocks (GMT like clocks) of
> clock slave's to clock masters.
>
> For physical layers without such services, this clause
> describes how such time-of-day clocks can be accurately
> synchronized by MAC-level services.
>
> From IEEE Std 1394 Serial Bus experiences, as well as
> the telecom industry as a whole, the value of synchronous
> transfers is greatly increased if time-of-day clocks
> can also be synchronized.
>
> DVJ
>
>
> David V. James, PhD
> Chief Architect
> Network Processing Solutions
> Data Communications Division
> Cypress Semiconductor
> 110 Nortech Parkway
> San Jose, CA 95134
> Work: +1.408.942.2010
> Cell: +1.650.954.6906
> Fax: +1.408.942.2099
> Work: djz@xxxxxxxxxxx
> Base: dvj@xxxxxxxxxxxx
>
> > -----Original Message-----
> > From: owner-stds-802-17@xxxxxxxxxxxxxxxxxx
> > [mailto:owner-stds-802-17@xxxxxxxxxxxxxxxxxx]On Behalf Of
> > Jeanne.De_Jaegher@xxxxxxxxxx
> > Sent: Wednesday, November 21, 2001 3:17 AM
> > To: stds-802-17@xxxxxxxx
> > Subject: [RPRWG] 802.17 Outline: Stratum Clock distribution?
> >
> >
> >
> >
> >
> > Good morning,
> >
> > Can someone tell me what the section over Stratum Clock
> > Distribution covers?
> >
> >
> > Thank's
> >
> > Jeanne
> >
> >
> >
>