Communication system and communication apparatus controlling a switching hub for power saving
AssigneeCanon Kabushiki Kaisha
InventorHiroki Ito
Life of this patent
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Abstract
A CPU of an image forming apparatus controls, according to establishment of a sleep change condition, a MAC/PHY in a network unit to change the image forming apparatus from a link-up state to a link-down state. The CPU controls the image forming apparatus to change from a normal mode to a deep sleep mode. A CPU of the network unit controls, according to the change of the image forming apparatus from the normal mode to the deep sleep mode, the MAC/PHY to change the link-down state of the image forming apparatus to the link-upstate. The CPU controls the MAC/PHY to transmit a MAC address necessary for causing the image forming apparatus to participate in VLAN to a switching hub.
Claims8
A communication apparatus comprising:
- a network unit;
- and
- a power control unit configured to cause the communication apparatus to return from a power-saving mode,
- wherein a communication speed of the communication apparatus operating in the power-saving mode is a first communication speed, and, when the communication apparatus returns from the power-saving mode, the communication speed of the communication apparatus is changed from the first communication speed to a second communication speed that is higher than the first communication speed,
- wherein, when the communication apparatus is started and a communication link is established with a switching hub, the network unit transmits identification information of the communication apparatus to the switching hub,
- wherein, when the communication apparatus returns from the power-saving mode and a communication link is established with the switching hub, the network unit transmits the identification information again to the switching hub.
A communication method for a communication apparatus comprising a network unit, and a power control unit configured to cause the communication apparatus to return from a power-saving mode, the method comprising:
- changing a communication speed of the communication apparatus from a first communication speed to a second communication speed that is higher than the first communication speed, when the communication apparatus returns from the power-saving mode, the communication speed of the communication apparatus operating in the power-saving mode being the first communication speed;
- when the communication apparatus is started and a communication link is established with a switching hub, transmitting, by the network unit, identification information to the switching hub;
- and
- transmitting, by the network unit, the identification information again to the switching hub, when the communication apparatus returns from the power-saving mode and a communication link is established with the switching hub.
A non-transitory storage medium storing a program causing a computer to function as units of a communication apparatus comprising:
- a network unit;
- and
- a power control unit configured to cause the communication apparatus to return from a power-saving mode,
- wherein a communication speed of the communication apparatus operating in the power-saving mode is a first communication speed, and, when the communication apparatus returns from the power-saving mode, the communication speed of the communication apparatus is changed from the first communication speed to a second communication speed that is higher than the first communication speed,
- wherein, when the communication apparatus is started and a communication link is established with a switching hub, the network unit transmits identification information of the communication apparatus to an external apparatus,
- wherein, when the communication apparatus returns from the power-saving mode and a communication link is established with the switching hub, the network unit transmits the identification information again to the switching hub.
Dependencies are inferred from the claim text.