a system for communicating

a conductor for transmitting electrical or optical signals or electric power

a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication

telephone central where circuits are completed with patchcords

electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds

the computer-based telephone system of the United States National Library of Medicine that provides rapid linkage to MEDLARS

a conductor for transmitting electrical or optical signals or electric power

a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication

telephone central where circuits are completed with patchcords

electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds