TELEPHONE DROP FOR CONNECTING SUBSCRIBER ANALOG LINE TO DIGITAL EXCHANGE USING TIME-DIVISION CHANNEL MULTIPLEX

摘要

telephone communications. SUBSTANCE: relay circuit is, essentially multifunction circuit arrangement and interface circuit is designed to perform inspection functions including check-up of subscriber line and subscriber terminal as well as to conduct tests of telephone drop circuit. EFFECT: simplified design due to reduced number of parts performing relay functions. 2 cl, 1 dwg