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:
Feb. 22, 2000
Filed:
Nov. 22, 1996
Atsuo Serikawa, Tokyo, JP;
Yasuhiro Saito, Tokyo, JP;
Yuji Maeda, Tokyo, JP;
Satoshi Kasuya, Nagoya, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
A communication-line-quality measuring system includes transmission and terminal equipment. Transmission equipment has a first frame assembling part transmitting a down-link multiplexed frame signal to a down-link line having a first frequency, and a first frame disassembling part disassembling an up-link multiplexed frame signal transmitted through an up-link line having a second frequency. Terminal equipment has a second frame disassembling part disassembling the down-link multiplexed frame signal, and a second frame assembling part transmitting the up-link multiplexed frame signal obtained by frame-multiplexing an output signal of the subscriber unit with a control signal, to the up-link line. A pattern generation part in the first frame assembling part provides a test signal to an available channel of signal frames in the down-link multiplexed frame signal. A loop-back part between the second frame disassembling part and the frame assembling part loops back the test signal derived from the down-link multiplexed frame signal in the second frame disassembling part to the second frame assembling part. The second frame assembling part provides the test signal in the up-link multiplexed frame signal to transmit to the transmission equipment. A comparing part in the transmission equipment compares the test signal in the up-link multiplexed frame signal, which is looped back by a control of the loop-back part, with a reference signal the same as the test signal generated in the pattern generation part.