FRAME SYNCHRONIZING METHOD

摘要

PROBLEM TO BE SOLVED: To enable reducing time required for restoring into a normal synchronous state by judging that an error or erroneous synchronization of a received package signal occurs when an undefined code value is received on a reception side and starting packet synchronization processing for taking in a new packet immediately. SOLUTION: Since frame synchronizing information is not detected within a timer time of T-05, communication equipment recognizes the occurrence of abnormality at this point of time. After that, packet synchronization processing for immediately taking in a new packet is started. Packet synchronization is established, frame synchronization information in a signal 400 is detected and the frame synchronization is established by a frame packet signal 400 of a frame frequency f(100)-#1 next to a frame F#100. Thus, the frame synchronization can be recovered by a time FS-T until the frame synchronization information is detected by a frame frequency f(100)-#2 after erroneous synchronization is generated by an n-th frame frequency f(100) of the frame F#100.