| 摘要 |
<p>PURPOSE:To suppress the difference in the observation accuracy due to the speed and to eliminate the observation error by setting an observation period for respective calls and observing at the arbitrary section. CONSTITUTION:An observing point of time the is the holding time unit of a fixed length packet and the observation of the traffic on a line is executed by an observing part 10. A counter part 15 holds the number of the packets to arrive in a past observation period time T up to the present time point as an observation value at the counter part 15. A value sum of the counter part 15 at a certain observation point of time shows the number of the arriving packets for the past observation period time from the time point. At a deciding part 16 to judge whether or not the observation result at the observing part 10 exceeds an arriving packet number specified value max in the observation period set to a specified value holding part 18 beforehand, the value sum of the counter part 15 and the value of the specified value holding part 18 are compared in a control part 17 and at the time of sum>msx, a specified value exceeding signal is generated.</p> |
