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Excellent link!

Also, for those that are new to the "RAN" terminology (as I was just a few minutes ago! <g>):

Are these part of WAN's[Wide Area Network]....?

A RAN is mini-WAN?

I would say Yes in terms of size: usually most of RANs are nationwide.

But No in term of type: RAN is a functional part of operator operational network and therefore not as function and traffic neutral as a WAN is.