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Arrangement for subscriber circuits utilizing digital time division multiplex telecommunication installations and particularly for PCM local exchanges

  • US 4,309,766 A
  • Filed: 08/30/1979
  • Issued: 01/05/1982
  • Est. Priority Date: 09/27/1978
  • Status: Expired due to Term
First Claim
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1. An arrangement for subscriber circuits of digital time division multiplex telecommunication installations such as PCM local exchanges for connecting subscriber lines having analog signals to digital switching networks comprising, at least two subscriber stations, a subscriber line connected to each subscriber station, a plurality of analog circuit elements associated with each subscriber line for processing analog signals, a coding and decoding time division multiplex circuit receiving and supplying digital and analog signals and converting them into analog and digital signals connected to at least two subscriber lines, with a number of subscriber lines connected to said coding and decoding circuit being limited by the product of the scanning frequency which forms the time base for the time division multiplex circuit and the conversion and transfer time which is necessary for the total and decoding in said time division multiplex circuit, an indicating circuit connected to said analog circuit elements and translating control signals on the subscriber lines into indication signals, digital interface circuits connected to said coding and decoding time division multiplex circuit, and digital trunk circuits connected to said digital interface circuits.

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