SONET/SDH

In the first installment in this series, we reported that service provider CapEx spending on Carrier Ethernet equipment seems to be overtaking spending on SONET/SDH in transport applications and that the respondents overwhelmingly (nearly 100 percent agreement) indicated support for Carrier Ethernet in the access portion of the network, while closer to 80 percent support its use in the core.

There are a number of things that service providers like about SONET/SDH.  They like the 50ms protection switching, deterministic performance even when the ring is fully loaded and five-9&rsq

Network operators today are facing a critical transition thanks to a number of factors, including continued expansion of IP-based business services and the overwhelming growth of new video and data