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Method of saving power in optical access network

  • US 8,346,082 B2
  • Filed: 05/22/2008
  • Issued: 01/01/2013
  • Est. Priority Date: 10/23/2007
  • Status: Expired due to Fees
First Claim
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1. A method of reducing power consumption for an optical network terminal (ONT) in an optical access network (OAN), the method comprising:

  • applying power so that the ONT operates normally in an activation mode;

    monitoring for a first state, a second state, and a third state;

    switching the ONT from the activation mode to a power-saving mode if one of the first, second, and third states is detected;

    transmitting, if any of the first, second, and third states are detected, a sleep signal, as a message notifying that the ONT will soon switch to the power-saving mode, from the ONT to an optical line terminal (OLT);

    switching the ONT to the power-saving mode and cutting off power for all functions of the ONT except for power for monitoring and controlling an external input;

    monitoring for a fourth state and a fifth state;

    switching from the power saving mode to the activation mode if one of the fourth and fifth states is detected; and

    transmitting, if the requirements for switching from the power-saving mode to the activation mode are satisfied, a wake-up signal from the ONT to the OLT and switching the ONT to the activation mode for normal operation;

    wherein the first state is a state in which all terminals connected to the ONT are in an abnormal operational state,the second state is a state in which the OLT has no packets to transmit to a terminal connected to the ONT while at least one of the terminals connected to the ONT is in a power-saving mode and the remaining terminals malfunction, andthe third state is a state in which the OLT cannot operate normally due to a link failure while at least one of the terminals connected to the ONT is in the power-saving mode and the remaining terminals malfunction.

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