Special Features:

Critical application

Properties:

A component consisting of two or more different items, such as resistors, telephone repeating coils and capacitors, electrically connected and designed to provide facilities for connecting one or more two-wire communications circuits to one or more four-wire communications circuits. May include band-pass filters and/or protective apparatus. For items fabricated by monolithic and/or thin film techniques, see microcircuit (as modified). See also network, impedance matching.