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Lifeline telephony provision for voice over digital subscriber line

  • US 6,272,209 B1
  • Filed: 08/16/1999
  • Issued: 08/07/2001
  • Est. Priority Date: 08/16/1999
  • Status: Expired due to Term
First Claim
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1. A method of operating voice over digital subscriber line (VoDSL) system comprising line terminating equipment incorporating a first VoDSL modem and coupled via a subscriber loop to customer premises equipment having a subscriber loop port coupled via a second VoDSL modem to a local telephony port so as to provide the customer with a lifeline voice service in the event of a customer premises equipment power supply failure, the method comprising the steps of:

  • at the line termination equipment, detecting a loss of digital transmission over the subscriber loop from the customer premises equipment, and, in response thereto, reconfiguring the first VoDSL modem as a voice telephony (POTS) interface and providing electrical power to the subscriber loop for operation of the customer premises equipment; and

    , at the customer premises equipment, responsive to said power supply failure providing a direct connection between said local telephony port and said subscriber loop port so as to enable direct communication between said local telephony port and said subscriber loop port and thereby maintain at least a voice service to the customer.

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