Integrierter metallischer Zugriff für DSLAM mit hoher Portdichte

A multi-services access platform (30) is presented for supporting metallic test access in switching or multiplexing devices such as digital subscriber line access multiplexers (DSLAMs). The multi-services access platform (30) includes a chassis (100) within which a predetermined number of card slots (102-106) are included. Each of the card slots includes a number of input/output ports. A backplane runs along the chassis and includes a metallic test access bus (142). The metallic test access bus (142) is operable to selectively couple to one or more input/output ports within the line card slots of the chassis to establish one or more metallic test paths. A relay matrix may be used to provide the selective coupling for the metallic test access bus, and the flexibility provided by the configuration of the relay matrix supporting the metallic test access bus allows for a variety of different test access ports (TAPs) to be supported. Specific TAP configurations may be configured that support both a Safety Extra Low Voltage (SELV) rated stimulus and a Telecom Network Voltage (TNV) rated stimulus such that local loops that support a variety of different signaling protocols can be tested using the metallic test access bus either individually or concurrently.