How do I wire up a filter and a dedicated wire in my outside dmarc for a home? SBC DSL FAQ| This is a step-by-step way to wire an outside dmarc (teleco box that separates the inside house wiring from the outside teleco wiring). This method needs to used if there's an alarm, or the existing wiring degrades the DSL line. Home wiring details Note: This pictorial also shows you how to remove a half-ringer/MTU/maintenance test unit. Orignally submitted by ADSL Guy. by Ranma | ||