Welcome to the ZyXEL Networking Glossary - your definitive source for descriptions of networking terms and ZyXEL's product features.
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SELT (Single End Loop Test) and DELT (Dual End Loop Test) are both loop test methods used to test the copper DSL line from the central office to the subscriber’s location. SELT is used to get basic information about a copper DSL line without having to install a CPE device (DSL modem for example) at the far end of the loop (such as the subscriber's home). See also DELT.