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Just considering all the possibilities.

As others have said, a particular channel set can cover a large geographic area, and not necessarily in an obvious or logical manner. It's the shared capacity that matters not the physical location of the users, people 10 miles away could be sharing your capacity (and affecting your connection) while others on the next street don't

My definition of local on VM would be everything from the CMTS down to the end user, the edge network being everything from the CMTS to the core, and the core being well, the bits that have core in their name.