Improvements to a test system of circuit Telephone '.'This Invention relates to improvements in Test System of telephone circuit.Characterized in that it comprises in combination mechanisms to implement a number of the coded pulse CircuitThe Series includes a coded encoding of direction; in the detector Circuit, a Remote Point, to detect the number of coded pulses; comparators connected to sensors.To receive the impulse series and compare the coding with the same direction in a direction Coding stored,To determine whether it has received the appropriate Coding direction; a First Switch connected to the Comparator operable during reception of the Codification of appropriate LeadershipTo connect a return Circuit of the Mesh circuit communicationIn response to receipt of the appropriate Instruction in the series return Mesh coded impulses; and a Second Switch connected to the Comparator operable for receivingThe Codification of the right direction, to control a Isolating Switch in respo

摘要

Telephone line testing equipment in which a series of alternating current tone pulses are transmitted from the central office along the lines to a sensing means placed at a remote point in the circuit. The sensing means receives the coded tone pulse sequence, decodes it to determine if the address is correct, and if so, what information is present, and then either connects or disconnects the remote equipment from the line or, in the alternative, connects suitable loopback testing circuits to the line.