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Welcome to the ZyXEL Networking Glossary - your definitive source for descriptions of networking terms and ZyXEL's product features.

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    A Dual End Loop Test (DELT) is also called a Loop Diagnostic Mode test or LDM test. Use DELT to perform a loop test where a CPE has been deployed. It provides details about the physical condition of a DSL subscriber’s line and more information than SELT, including line data rate, SNR margin and noise. It uses the CO equipment and the CPE to test the loop in both directions.