DUPLEX COMMUNICATION METHOD FOR CATV SYSTEM

摘要

PURPOSE:To improve the reliability of audio data sent from a terminal equipment to a transmission line by reducing a time required for polling of all terminal equipments. CONSTITUTION:For example, four terminal equipments I-IV are used for one block and an exciting command to excite a PLL for generating an incoming FSK signal to allow the terminal equipments to output data simultaneously is sent and after the exciting is finished, a reply data request command to request incoming data is sent to recover the incoming data while designating the terminal equipments of the block sequentially.