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:
Jul. 19, 1983
Filed:
Jun. 29, 1981
Roberto Delle Donne, Milan, IT;
Abstract
A transmitting section of a PCM station in a telecommunication system, embodied in an integrated-circuit chip, comprises a channel-forming circuit receiving a stream of data bits to be organized into a succession of outgoing frames each consisting of a series of channels containing respective 8-bit words or bytes. A multiplexer in the channel former replaces part of a received byte assigned to the No. 0 channel of each frame, including its second and third bits, with certain bits to be included in two alignment words A and B respectively transmitted to a remote terminal at the beginning of alternate frames. The third bit of word B is high when a malfunction is detected or when the replaced second and third bits of the corresponding byte have certain configurations detected by a decoder, calling either for the closure of a loop between the local transmitting and receiving sections or for the monitoring of the PCM line extending to the remote terminal. The latter operation is controlled by a remote-supervision circuit which, in response to either of two such bit configurations, causes the bits of one or more frames to be sent out in either of two representations selectively established by an associated coder.