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Re: SONET/Ethernet clock tolerance


At 11:06 AM 3/29/00 +0900, Osamu ISHIDA wrote:
>Here 10 Gigabit Ethernet will require only ONE Path STS-192c in the payload.
>I don't believe re-using expensive SONET regenerator for 10GbE is a good 
>unless you have already invested in it.

Exactly,  I think you hit the nail on the head.  I have listened very hard 
for months now to the SONET discussion and the debates on the LAN vs WAN PHY.

I have always interpreted the requirement for the so-called WAN PHY as an 
installed base issue. Some WAN folks believe there is a requirement to 
preserve the investment in installed SONET-TDM equipment which is driven by 
a return on invested capital business model.

There are other models and other ways of building networks.  It is 
refreshing to hear other points of view.

Bruce Tolley
Cisco Systems