Control of power supply to subcribers in digital switch board with respect to data-communication calls
AssigneeFujitsu Limited
InventorYasunori Ogawa
Life of this patent
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Abstract
A device for controlling power supply to subscribers in a digital subscriber-switch board includes subscriber-line circuits which supply power to the subscribers, and a carrier-detection unit which is connected to a communication path to detect a carrier signal of a modem once the communication path is established between a caller and a receiver, the caller being one of the subscribers, wherein one of the subscriber-line circuits corresponding to the one of the subscribers is controlled to suspend power supply to the one of the subscribers when the carrier-detection unit detects the carrier signal on the communication path.
Claims16
A device for controlling power supply to subscribers in a digital subscriber-switch board, comprising:
- subscriber-line circuits which supply power to said subscribers;
- and
- a carrier-detection unit which is connected to a communication path to detect a carrier signal of a modem once said communication path is established between a caller and a receiver, said caller being one of said subscribers,
- wherein one of said subscriber-line circuits corresponding to said one of said subscribers is controlled to suspend power supply to said one of said subscribers when said carrier-detection unit detects said carrier signal on said communication path.
A subscriber-line circuit used in a digital subscriber-switch board and supplying power to a subscriber, comprising:
- a carrier-detection unit which looks for a carrier signal of a modem on a communication path once said communication path is established through said subscriber-line circuit between a caller and a receiver, said caller being said subscriber,
- wherein the power supply to said subscriber is suspended when said carrier-detection unit detects said carrier signal on said communication path.
Dependencies are inferred from the claim text.