Ethernet Transport
So far, this book has addressed the reasoning behind adopting Ethernet as an access interface rather than a TDM interface. But as discussed in this section, Ethernet isn't limited to being an access technology. Many efforts have been made to extend Ethernet itself into the MAN as a transport technology. Since the early 2000s, metro Ethernet deployments have taken many shapes and forms; some have proven to work, and others have not. When Ethernet is used as a transport technology, the access network can be built in either ring or hub-and-spoke topologies. These are discussed next.
Gigabit Ethernet Hub-and-Spoke Configuration
In a Gigabit Ethernet hub-and-spoke configuration, Ethernet switches deployed in the basement of buildings ...
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