Black Box SP-3-SDP Micromux Dual Port DCE Interface

The Black Box SP-3-SDP Micromux Dual Port DCE Interface is a two-port X.21 data-communications module designed to occupy the DCE side of X.21 links, helping operators correctly interface DTE equipment with the X.21 network. The unit provides two X.21 ports configured for DCE signaling, with connector options described as BNC and balanced-pair terminations, enabling flexible integration with a variety of X.21 devices and cabling schemes. It is powered from a 240 VAC supply, reflecting its heritage in telecom and industrial environments where reliable AC-powered equipment is common. As part of the Micromux family from Black Box, the SP-3-SDP offers a purpose-built, dual-port solution for establishing X.21 connections, supporting lab testing, network emulation, and field deployments that require a dedicated DCE interface without ambiguity about port roles. With two X.21 ports, technicians can route, monitor, or emulate two X.21 links in a single module, simplifying test setups and reducing equipment footprint.