The geographic coverage of carriers’ enterprise network services varies significantly. Not every carrier connects to every city in their customers’ networks, and not all services are available everywhere.
When narrowing down the universe of potential suppliers, enterprises must first consider how their geographic requirements overlap a potential service provider’s physical network. They then must determine if the specific data services they require are enabled at each of the service providers’ PoPs.
TeleGeography's WAN Services Coverage analysis—part of our Cloud and WAN Research Service—examines carrier network connectivity and service availability from a geographic perspective.
Here's a snippet of that analysis, followed by some handy definitions.