FRAME PHASE CONVERSION CIRCUIT, CROSS CONNECT DEVICE AND RECEIVER

摘要

PROBLEM TO BE SOLVED: To warrant time sequence between signals through a same transmission line by adopting a control method of a phase conversion buffer among plural signals in common, making a difference between a write address and a read address between buffers constant while no stuffing is made to the phase conversion buffer so as to transmit plural signals while keeping a frame phase difference. SOLUTION: A demultiplexer section 1 demultiplexes an STM-1 frame into three AU-32 and gives them to highways 32-34. A memory is divided into ES2-4 and buffers 11-13, and a clock signal is replaced in one memory. Then a phase comparator section 7 makes analog discrimination as to whether or not twice- reading or skipped reading of the ES to absorb wondering is to be executed, stuff bits are produced simultaneously in the AU-32#1-#3, stuffing is executed in post-stage buffers 11-13 and transmission is attained while arranging frame phases between the AU-32. Furthermore, independent frame phase conversion is attained for an input signal having an independent frame phase.