This manual describes the Telephone Line Simulator-4A which tests telephones and other telecommunications devices. The TLS-4A Telephone Line Simulator offers a convenient means for setting up temporary “telephone lines” to demonstrate or test equipment where actual central office lines are not easily available. The TLS-4A provides four simulated lines, two “talk paths” or connections, and an audio interface port, making it a versatile device for a variety of applications including:
