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:
Jun. 15, 1993
Filed:
Oct. 31, 1989
Minoru Ishikawa, Tochigi, JP;
Nobuki Nakata, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An improved drop/insert multiplexer for use in a channel access unit that uses common channel slots for data channels in first and second directions, and uses less wiring between a multiplexer/de-multiplexer section and a channel section. The drop/insert multiplexer has at the receive side thereof, a time slot phase difference setting stage for providing a predetermined phase difference between received timing signals as well as receive data from the first and second directions; a receive channel pulse generating stage generates multiplexed channels pulses; a receive channel pulse decoding stage and a PCM decoder reproduces a voice signal by receiving selected received data. At the send side thereof, a time slot phase difference correcting stage corrects the set phase difference for sending out channel data to the first and second directions; a send channel pulse generating stage generates multiplexed channel pulses; a send channel pulse decoding stage and a PCM coder produces PCM signals to send out to the first and second directions as channel data.