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To: Kenneth E. Phillipps who wrote (2250)	10/25/1998 8:47:00 AM
From: Hiram Walker	Respond to of 12823

Kenneth, Ovum is a little wrong and a little right. There are significant hurdles to a transparent all optical network,and interoperability issues there that may take 5 years or more to solve. But they are wrong as to MetroDWDM and opaque add/drop multiplexors,and a regenerated signal at the hub. That is here and now,and totally interoperable. In fact it is being deployed en mass with TCI for future services,and COX where future services may need more capacity. As far as Telco's are concerned, I hear there will be a big announcement regarding DWDM from BellSouth very soon. Expect things to heat up very fast,most networks initially install WDM for upstream capacity. Then they start to install two-way DWDM. I think they are underestimating MetroDWDM as that is here and now,the transparent all optical network is a few years away at least,and maybe more than that. The frontier has gone from the backbone to the MAN. I don't understand the carry issues,DWDM will carry anything under it,it is layer lambda and is going to work great with both ATM and SONET. I expect SONET to underly DWDM for at least a few years at layer 1. Hiram