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Telephony system with automatic test call generator for remote port groups

  • US 4,430,530 A
  • Filed: 11/29/1982
  • Issued: 02/07/1984
  • Est. Priority Date: 08/24/1981
  • Status: Expired due to Term
First Claim
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1. A method for testing circuitry in a telephony network that comprises a digital central office with call processing means that transfer voice data and supervisory data, remote port units connected to remote subscriber lines, a communications link between the remote port units and the digital central office, interface means for interfacing the communications link, an automatic test call means for communicating through the digital central office means and a remote test call means in each remote port unit, said method comprising the steps of:

  • A. establishing a communications path between a remote test call means and the automatic test call means,B. generating, in the automatic test call means, a first tone for transfer through the interface means as voice data to the remote test call means in response to the establishment of communicatins,C. generating, in the remote test call means, a second tone for transfer through the interface means as voice data to the automatic test call means in response to the receipt of the first tone from the automatic test call means,D. generating, in the remote test call means, signals corresponding to dial pulses for transfer as supervisory data through the interface means to the automatic test call means in response to the completion of the second tone, andE. testing, in the automatic test call means, the second tone and dial pulse signals, andF. generating, in the automatic test call means, an indication of success or failure of the test in response to said testing.

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