Re: Clock Tolerance and WAN PHY
Roy,
Roy Bynum wrote:
> ...<cut>... There is even a discussion going on as to
> the requirement for a +20 PPM clock for non-TDM multiplexed optical signals.
What do you mean with 'non-TDM multiplexed optical signals'?
Regards,
Erik.
--
* Erik van Oosten
* Lucent Technologies
* mailto:evoosten@xxxxxxxxxx
Roy Bynum wrote:
>
> Luigi,
>
> Be careful when comparing ITU-T standards to IEEE standards and the
> possible common applications. I am attending ITU-T SG7 where we will be
> doing approval of Ethernet over LAPS. I am also working with the people
> from WorldCom that are attending other ITU-T groups that are working on
> transmission specifications, including the OTN work.
>
> An interesting thing is emerging. Because of the management overhead for
> P802.3ae WAN PHY, it also becomes a client on the OTN. Because of the
> expense compatibility issues of implementing some of the elements of the
> OTN, I expect it will be several years before it becomes a reality. There
> are portions of the OTN architecture, referred to as Automatic Switched
> Optical Networking (ASON) that may be implemented earlier than the full
> OTN. The management overhead on the WAN PHY will help greatly in early
> deployment of that technology. There is even a discussion going on as to
> the requirement for a +20 PPM clock for non-TDM multiplexed optical signals.
>
> Thank you,
> Roy Bynum