FRAME MAPPING AND DEMAPPING UNIT IN THE N-ISDN FOR CATV DISTRIBUTION

摘要

a first group multiplexing interface means(21) interfacing with a frame of the first group multiplexing unit; a clock distributing means(25) distributing it into the first group multiplexing interface means(21) the clock received from the multiplexing unit outside the PCM control means(22) mapping the channel information of one subscriber from the first group multiplexing signal of 12 subscribers with a time slot; several frame arranging means(23) arranging the frame; several phase arranging means(26) arranging the phase difference between the data and the clock; a switching means(27) switching to transmit the designated number; and a CPU(24) providing the switching means with the subscriber information through a RS-232C connection part(28).