An enclosure used with a system for delivering broadband service, including standard telephone service and telephone/DSL service, to a subscriber. The system includes a pair gain system, a cross-connect system, and a service distribution system. The enclosure is a retro-fit enclosure that incorporates the service distribution system into an existing cross-connect enclosure in a cost-effective and aesthetic manner. The service distribution system is operably located such that the standard telephone service and telephone/DSL service are routed from the service distribution system to the subscriber without being routed through the cross-connect system. The service distribution systems include terminating modules and switching modules. In some embodiments, the switching modules include protector plugs that protect the system from over-voltages and/or over-currents, and provides upstream and downstream diagnostic testing.