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Transport/Core networks require new look at test The move to next-generation networks (NGN) is anything but straightforward. Evolving technology, unprecedented customer expectations, and the challenges of a legacy infrastructure combine to present some daunting tasks. Yet with advanced, highly integrated test equipment, telecom operators can overcome these challenges while effectively managing capital and operational expenditures.    MAN Testing goes Next-Generation Companies providing communications services to the enterprise market are going to find themselves using existing Ethernet over SDH/SONET (EoS) infrastructure. Doing so drastically changes the requirements for testing metropolitan area networks (MANs), however. Traditional physical layer tests no longer provide the in-depth testing required for valid and reliable results.