The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 1999
Filed:
May. 15, 1997
Atsuo Hatono, Yokohama, JP;
Tatsuo Mochinaga, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An ATM exchange for performing the flow control adaptively in accordance with the seriousness of congestion, provided with a first threshold comparing circuit and a second threshold comparing circuit for comparing a cell queue length in a buffer of the exchange with a first and a second threshold, a timer counter which starts counting when the queue length exceeds the first threshold and is cleared to zero when the the queue length becomes smaller than the second threshold, a permissible time comparing circuit for comparing the count value with a permissible time, and a congestion counter for counting the output of the comparing circuit. The ATM exchange sets the first threshold, second threshold, and permissible time from the number of multiplexings of standard traffic, mean cell rate, peak cell rate, mean survival time of burst length, and false alarm probability, and judges that the heavy congestion is occurring when the queue length does not return to the second threshold or lower within the permissible time, and controls the flow of traffic, and at the same time, when this state continues, the flow restriction is enhanced depending on the elapsed time from the permissible time.