| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a system and method for metallic-testing a subscriber line that provides both voice and digital subscriber line services. SOLUTION: The voice service is provided by a voice switch and the DSL service is provided by a digital subscriber line access multiplexer (DSLAM). Each of them includes a metallic line test unit. The voice line in the voice switch has a connection to a first metallic line test bus connected to the voice switch metallic line test unit via a first relay set. The DSL line in the DSLAM card has a connection to a second metallic line test bus, which is also connected between the DSLAM metallic line test unit and the subscriber line. A second set of relays control the connection of the metallic line test bus to the subscriber line. A signal is sent from either metallic test unit to cause the relays to change to provide a clear path for metallic testing.</p> |
