Special Features:

Dial up operation; 2-/4- wire closed line operation; automatice dial back up of leased lines; line-quality testing; itu v.13 half duplex; extensivesecurity features; industrial version available; x.25 network access; dc power supply options

Properties:

An item which modulates and demodulates one or more electrical signals. It connects data terminal equipment to a communication line or network such as telephone, radio or telegraph. It may include the multiplexing and demultiplexing circuits, circuit amplifiers and source(s) of carrier frequency. For items designed for light signals, see modem, fiber optic.