Optical network terminal with low-power sleep logic that substantially extends the life of the battery after the AC main power supply has been lost
AssigneeTellabs Petaluma, Inc.
InventorsJerry Vereen, Ronald Diego, Barry Farber
Life of this patent
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Abstract
An optical network terminal includes a sleep logic circuit that assumes responsibility for monitoring off-hook transitions after the AC main power supply has failed for a predetermined period of time. The sleep logic circuit is very low power and, as a result, allows the optical network terminal to remain active and provide lifeline support for a much greater period of time.
Claims34
An optical network terminal (ONT) that receives a video signal, a data signal, and a voice signal from an optical line terminal and transmits the video signal, the data signal, and the voice signal to a subscriber when power from an external power source is present, the ONT consuming a first amount of power when the ONT simultaneously transmits the video signal, the data signal, and the voice signal to the subscriber, the ONT comprising:
- a processor having a normal mode and a battery mode, the processor:
- continuously monitoring the external power source, and checking a power status indicator from a battery power source;
- detecting a loss of power from the external power source;
- entering the battery mode from the normal mode and stopping a transmission of the video signal after detecting the loss of power from the external power source, the ONT consuming a second amount of power when the ONT simultaneously transmits the data signal and the voice signal, the second amount of power being less than the first amount of power;
- stopping a transmission of the data signal while in the battery mode after the external power source has been lost for a first predetermined period of time, the ONT consuming a third amount of power when the ONT only transmits the voice signal, the third amount of power being less than the second amount of power;
- and
- detecting off hook transitions when power from the external power source is present, and during the first predetermined period of time.
The ONT of claim 21 wherein the voice message is periodically repeated while the processor is waiting to receive the ranging message.
A method of extending an amount of time that battery power is available to an optical network terminal (ONT) that receives a video signal, a data signal, and a voice signal from an optical line terminal and transmits the video signal, the data signal, and the voice signal to a subscriber when power from a first power source is present, the ONT consuming a first amount of power when the video signal, the data signal, and the voice signal, are simultaneously transmitted, the method comprising the steps of:
- continuously monitoring the first power source, and checking a power status indicator from a second power source;
- detecting a loss of power from the first power source, the second power source providing power when the loss of power from the first power source is detected;
- stopping a transmission of the video signal when the first power source is detected as lost, the ONT consuming a second amount of power when simultaneously transmitting the data signal and the voice signal, and the video signal is turned off, the second amount of power being less than the first amount of power;
- stopping a transmission of the data signal after the first power source has been detected as lost for a first predetermined period of time, the ONT consuming a third amount of power when transmitting only the voice signal, the third amount of power being less than the second amount of power;
- and
- detecting off hook transitions when power from the first power source is present, and during the first predetermined period of time.
An optical network terminal (ONT) that receives a video signal, a data signal, and a voice signal from an optical line terminal and transmits the video signal, the data signal, and the voice signal to a subscriber, the ONT consuming a first amount of power when the ONT simultaneously transmits the video signal, the data signal, and the voice signal to the subscriber, the ONT comprising:
- a processor having a normal mode and a battery mode, the processor:
- continuously monitoring an external power source, and checking a power status indicator from a battery power source;
- detecting a loss of power from the external power source;
- entering the battery mode from the normal mode and stopping a transmission of the video signal and the data signal after detecting the loss of power from the external power source, the ONT consuming a second amount of power when the ONT only transmits the voice signal, the second amount of power being less than the first amount of power;
- and
- detecting off hook transitions when power from the external power source is present, and during the first predetermined period of time.
Dependencies are inferred from the claim text.