Circuit emulation, though advancing in sophistication, continues to concern operators and limit their enthusiasm for transitioning fully to Ethernet optical transport. Most operators believe Ethernet will in fact catch up soon, but standards work must be completed, performance demonstrated, and interoperability proven.

They still think of the core as more of a static thing.

You don?t have quite the bandwidth requirements, or the density of high-bandwidth customers in one location.

If an operator puts one in every central office to manage their fibers, then you're talking about a big market: 20,000 COs in the U.S..