In telecommunications, a multiplexer is a device that combines several input information signals into one output signal, which carries several communication channels, by means of some multiplex technique. A demultiplexer is in this context a device taking a single input signal that carries many channels and separates those over multiple output signals. Below is a list of multiplexor suppliers

• Waveline, Inc.
• Anatech Electronics, Inc.
• Instruments for Industry
• Narda Microwave East
• Reactel, Inc.
• M/A-COM
• Star Microwave, Inc.
• Wenteq Microwave
• Dow-Key Microwave
• Microwave Circuits, Inc.
• M2 Global
• Marki Microwave
• Maury Microwave, Inc.
• MCLI
• Mega Industries, Inc.
• Microtech, Inc.
• Microwave Development Laboratories
• Microwave Devices
• Microwave Filters
• Nanowave