Abstract: A meter interface unit for interconnecting utility meter reading apparatus to a telephone line to allow the automatic reading of utility usage at the telephone central office in response to an interrogation signal from the telephone central office. The meter interface unit converts meter reading signals to alternating signals for transmission to the telephone central office when a subscriber's telephone is on-hook. The unit also encodes a subscriber or customer identification signal which is transmitted with utility usage data to eliminate the need of any manual reading of the utility meter at the customer's premises. The meter interface unit is powered over the telephone line.

Abstract: A test set designed for testing meter reading units as well as telephone line connections for automatic utility meter reading systems. The test set is capable of simulating the meter reading apparatus when testing the telephone line and of simulating the telephone line when testing the meter reading components. The test set further simulates the receiving apparatus in the central office to test the combination of the meter reading apparatus and the telephone line. The test set is self powered by batteries or may be powered from conventional AC outlets. The test set is operative both in the telephone plant and in the field.