Until Digital Subscriber Line (DSL) technology became a reality, service providers such as Internet Service Providers (ISPs), Competitive Local Exchange Carriers (CLECs), and Network Service Providers (NSPs) did not have a viable technology for cost-effectively serving a large number of buildings and tenants. With alternative technologies such as Ethernet or fiber, service providers could address only a limited segment of the market due to technological limitations or the requirement for expensive new infrastructure—and thus found it difficult to develop and justify a profitable business case. DSL has changed the competitive landscape, as it is a technology well suited to in-building deployments, allowing service providers to profitably deliver broadband services to MTU, MDU, and hotel properties.
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