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Black Box Network - Mt1430A-Sm-Sc - Black Box T1E1 To Fiber Mux Single-Mode Duplex Sc 30 Km - Optical Fiber CoaxialIdeal for extending T1 connections over fiber to remote PBX equipment. Local loopback on both the copper and fiber ports. It also offers remote fiber loopback and circuit test modes. configurable alarm relay contacts enable you to set ..