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. 27, 1990
Filed:
Aug. 08, 1988
Iwatsu Electric Co., Ltd., Tokyo, JP;
Abstract
There is disclosed a data circuit-terminating equipment (DCE) which connects a start-stop synchronous data terminal equipment (DTE) which is not synchronized with a PCM transmission line having various speeds. Further the DCE can satisfy recommendations of the V25 bis of CCITT. The DCE includes a start-stop synchronizing circuit to deliver a sampled request-to-send signal RS, a sampled send data and to transmit a clear-to-send signal CS to the DTE, a PLL obtaining a clock from the line, a timing generator generating timings for circuits, a mapping circuit mapping to make the sampled send data match into the line speed, a sending register converting transmission speed of the mapping circuit output to send to the line at the instructed period, a receiving register receiving data from the line to deliver data with the required speed during the required period for the DTE, and a demapping circuit receiving the receiving register output to demap and send to the DTE. In the DCE satisfying the recommendations, the demapping circuit ANDs a clear-to-send signal and bits indicating the synchronized state to send the clear-to-send signal, and a short line shorting the clear-to-send signal and a carrier detect signal is employed.