SYNCHRONOUS NETWORK SYSTEM, SYSTEM FOR CONFIRMING NUMBER OF CHAINS FOR THE SAME AND RECORDING MEDIUM RECORDING CONTROL PROGRAM THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a synchronous network system capable of easily monitoring the number of chains of a synchronous network timing reference and easily confirming whether the previously specified number of chains is satisfied or not. SOLUTION: A counter part 13 adds and clears 'inter-SSU chain number' and 'total chain number' added to an SSM extracted from an STM-n signal by terminating parts 11 and 12. A discrimination part 14 discriminates whether the 'inter-SSU chain number' and 'total chain number' exceed the preset specified number or not and a reporting means 15 reports the 'inter-SSU chain number' and 'total chain number' exceed the specified number to the outside. Based on this discriminated result, a generation part 16 generates a new SSM, STM-n signal transmitting parts 17 and 18 add the new SSM to the STM-N signal and respectively transmit it to network devices 2 and 3, and a 2M signal transmitting part 19 adds the new SSM to a 2M signal and transmits it to an SSU 4.