Switch Interfaces for Network AccessThe sophisticated network access platforms being deployed worldwide share a common technical heritage. These can all trace their roots to the relay concentrators and early subscriber loop carrier systems that were deployed to relieve congested feeder plant. These early systems, for the most part, were developed as adjuncts to specific switches and consequently were not universally applicable. As the potential of these systems to provide additional services and their economics became appreciated, "pair gain" became less of an issue. With the advent of more capable access platforms and the demand for a richer service offering from subscribers, a powerful and extensible open interface between switch and access network elements became a vital requirement for telephone operating companies to remain competitive.
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