PURPOSE: To suppress the increase of traffic caused by insertion of a monitoring use cell at the time of the normal state and at the same time to secure the monitoring ability at the time of the deterioration state.
CONSTITUTION: A 1st BIP computing part 111 calculates the bit interleave parities at every virtual path or channel and for every certain number of cells and outputs the calculated parities as the 1st computing results. A monitoring cell inserting part 115 inserts the monitoring cell storing the 1st computing results in the pay load into a transmission line. A monitoring use cell extracting part 118 extracts the monitoring cell out of the transmission line. Then a 2nd BIP computing part 117 calculates the bit interleave parities every certain number of cells of the correspondent virtual path or virtual channel that is sandwiched between the extracted monitoring cells and outputs the calculated parities at the 2nd computing results. Then a computing result comparing part 119 compares the 1st computing result with the 2nd one to monitor the bit error ratio and to vary a certain number of cells at every virtual path or channel.
NISHIHARA MOTOO
UEDA HIROMI
OTA HIROSHI
NIPPON TELEGRAPH & TELEPHONE
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