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:
Aug. 27, 2002
Filed:
Jun. 01, 1998
Toshiya Kondo, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A selective VP protection method in an ATM network for protecting a virtual path connection selectively employing VP end protection and arbitrary VP protection is proposed. In the method, the VP-AIS cell which is transmitted downward by each failure detecting node is composed including an area for carrying a switching flag which indicates the presence or absence of execution of the arbitrary VP protection by the failure detecting nodes. When an ATM cross-connect node capable of executing the arbitrary VP protection detected a line failure, the failure detecting ATM cross-connect node determines whether or not it executes the arbitrary VP protection in order to relieve the line failure, and transmits downward the VP-AIS cell in which the switching flag has been set according to the determination. The VP end node which received the VP-AIS cell refers to the switching flag and executes the VP end protection if the switching flag indicated the absence of execution of the arbitrary VP protection by the failure detecting nodes. By adequate selective use of the arbitrary VP protection and the VP end protection according to the method, high speed VP protection in an ATM network and high compatibility between various types of VP end protection and various types of arbitrary VP protection can be realized.