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. 19, 2017
Filed:
Oct. 22, 2014
Applicant:
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Inventors:
Assignee:
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F 1/00 (2006.01); G02F 2/00 (2006.01); H04B 10/00 (2013.01); H04J 14/00 (2006.01); H04J 14/02 (2006.01); H04Q 11/00 (2006.01);
U.S. Cl.
CPC ...
H04J 14/0297 (2013.01); H04J 14/0282 (2013.01); H04J 14/0295 (2013.01); H04Q 11/0066 (2013.01); H04Q 2011/0016 (2013.01); H04Q 2011/0043 (2013.01); H04Q 2213/1301 (2013.01); H04Q 2213/13295 (2013.01);
Abstract
A protection method wherein an ONU switches a reception wavelength to a backup wavelength so as to be logically connected to a backup OSU designated in advance for each ONU when the ONU detects a failure in an OSU to which the ONU is originally assigned, while the ONU keeps on holding its own connection information with the OLT. In the OLT, a backup OSU for the ONU which is originally assigned to the failed OSU is notified of the information on the ONU when the OLT detects a failure in an OSU. In this way, the ONUs which are originally assigned to the failed OSU resumes communication in a short period.