| 摘要 |
<p>PROBLEM TO BE SOLVED: To accurately supervise the legitimacy of a pointer value of the cell at a receiving terminal when a sending terminal sends an ATM cell of ITU-T recommendation I.363.1 provision. SOLUTION: This system is provided with a supervisory processing part 43 that detects a cell in which both sequence count(SC) value and pointer value in a SAR-PDU header of a receiving cell show 'zero', also, calculates a receiving cycle of a cell whose SC value and pointer value alike show 'zero' and supervises that a cell in which both the detected SC value and pointer value show 'zero' is received according to a calculated cycle and also, a prediction processing part 42 that predicts a receiving cycle of a cell in which both SC value and pointer value which are subsequently received after pointer synchronization is established show 'zero', and the supervisory processing part performs an alarm output and also detects abnormality of the part 42 by comparing the coincidence between the receiving cycle and predictive value of a cell when a cell whose SC value and pointer value alike is not received according to the calculated cycle.</p> |
