RATE COLLECTING SYSTEM FOR COIN TELEPHONE FOR OUTDOOR SERVICE

摘要

PURPOSE:To secure collection of the coin for the coin telephone of outdoor service by calling out the special number of a small digit number to open the cover of a box. CONSTITUTION:The operator picks up handset 11 and dials the special number to call out the special trunk. Switchboard 20 connects special trunk 30 with terminal unit 10 to send the ring-back tone to handset 11. After confirmation of the ring-back tone, the operator turns on button 14 exclusive for the coin collecting work. Thus, the C-relay of the special trunk operates to stop the ring-back tone as well as to supply DC voltage E1 for opening the box to line L2.