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:
Nov. 12, 2002
Filed:
Nov. 18, 1998
Takashi Fujinaga, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An optical subscriber unit comprises a portion for detecting whether or not an installation distance of the optical subscriber unit is a short distance or a long distance when the optical subscriber unit receives a subscriber command from a center unit by referring to a received optical power, and a portion for transmitting response burst signal to an entrance use slot of the current frame when the installation distance is the short distance and to an entrance use slot of the next frame when the installation distance is the long distance. The center unit comprises a response burst signal detecting portion for detecting whether or not the response burst signal of the optical subscriber unit against the subscriber command in the current entrance use slot is present in the current entrance use slot, and an installation distance detecting portion for measuring a delay time period of the response burst signal of the optical subscriber unit against the subscriber command in the current entrance use slot so as to obtain the installation distance of the subscriber unit.