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:
Sep. 10, 1996
Filed:
Mar. 16, 1994
Eiji Sugawara, Kawasaki, JP;
Fujitu Limited, Kawasaki, JP;
Abstract
A method and apparatus for detecting the presence or absence of errors caused along a designated section of a virtual path established within a communication network. The number of errors is detected at both the entrance and exit of a detection section. The number of errors detected at the entrance is transmitted to the exit by using a path overhead of a virtual path to be monitored, and the number of errors at the entrance is subtracted from the number of errors at the exit, thereby calculating the number of errors caused along the detection section. The path overhead containing data on the detected error count includes a parity compensation bit that is set so that the parity carried in the path overhead remains unchanged. This eliminates the need to recalculate bit interleave parity-2 for the virtual path under monitoring.