Configuring an operating state of a terminal device

• US 8,082,458 B2
• Filed: 11/12/2008
• Issued: 12/20/2011
• Est. Priority Date: 11/12/2008
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Kay, William Kevin
• Primary Examiner(s): Phan, Raymond
• Application Number:
  US12/269,431
• Publication Number:
  US 20100122098A1
• Time in Patent Office: 1,133 Days
• Field of Search: 713/300, 713/310, 713/323, 713/324, 713/340, 709217-219
• US Class Current: 713/320
• CPC Class Codes: G06F 1/3209 Monitoring remote activity, e.g. over telephone lines or network connections
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04L 12/2818 from a device located outside both the home and the home network access arrangements H04L12/2856; for remote control or remote monitoring of applications H04L67/025; arrangements for transmitting signals characterised by the use of a wireless eletrical link G08C17/00; telephonic communication systems adapted for combination with remote control systems H04M11/007
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

Techniques are described herein for achieving network-based wake-up functionality for power management functions using a standard network controller for embedded applications. A network controller is configured to receive packets sent via a network and to respond to the packets depending on a destination media access control (MAC) address contained in the packets. A processor coupled to the network controller configures an operational MAC address for network traffic that the network controller is responsive to based on an operating state.

Claims

1. A method comprising:

generating a predetermined locally administered destination media access control (MAC) address from a global destination MAC address;

configuring, in response to a low power event, a destination MAC address for network traffic that a network controller in a terminal device is responsive to from the global destination MAC address to the predetermined locally administered destination MAC address; and

entering a low power state for the terminal device in response to the low power event.

2. The method of claim 1, and further comprising in response to a network packet received by the network controller that is addressed to the predetermined locally administered destination MAC address, switching an operating state of the terminal device from the low power state to another operating state.

3. The method of claim 1, and further comprising the network controller not responding to broadcast packets addressed to a local broadcast domain associated with the terminal device in the low power state.

4. The method of claim 1, wherein generating the locally administered MAC address comprises setting at least one bit in a field of the global destination MAC address to a predetermined value.

5. The method of claim 1, and further comprising receiving a network packet comprising a low power command that corresponds to the low power event.

6. The method of claim 2, wherein switching the operating state comprises switching the operating state from the low power operating state to a normal operation state.

7. The method of claim 6, wherein switching the operating state is responsive to a packet addressed to the predetermined locally administered MAC address that is received via a local area network.

8. The method of claim 2, and further comprising transmitting a message indicating a change in status of the terminal device.

9. An apparatus comprising:

a network controller that is configured to receive packets sent via a network and to respond to the packets depending on a destination media access control (MAC) address contained in the packets; and

a processor coupled to the network controller, wherein the processor is configured to;

generate a predetermined locally administered destination MAC address from a global destination MAC address, and

configure an operational MAC address for network traffic that the network controller is responsive to based on an operating state.

10. The apparatus of claim 9, wherein the processor configures the operational MAC address to be the global destination MAC address when in a normal operating state and to be the predetermined locally administered destination MAC address when in a low power state.

11. The apparatus of claim 9, wherein the processor is configured to generate the locally administered MAC address by setting at least one bit in a field of the global destination MAC address to a predetermined value.

12. The apparatus of claim 10, wherein the processor enters the low power state in response to a low power event, and wherein the network controller is not responsive to packets addressed to the global destination MAC address or broadcast MAC address during the lower power state.

13. The apparatus of claim 12, wherein in the low power state the network controller is responsive to a received network packet that is addressed to the predetermined locally administered destination MAC address to send an interrupt to the processor that causes the processor to switch from the low power state to the normal operating state.

14. The apparatus of claim 12, wherein the processor is configured to respond to a network packet comprising a low power command that corresponds to the low power event.

15. Logic stored on a computer readable storage media for execution and when executed operable to:

monitor an operating state of a terminal device;

generate a predetermined locally administered destination media access control (MAC) address from a global destination MAC address; and

configure an operational MAC address for network traffic that a network controller is responsive to based on the operating state of the terminal device, wherein the network controller will not respond to the network traffic when the operational MAC address is the predetermined locally administered destination MAC address.

16. The logic of claim 15, wherein the logic that configures comprises logic that configures the destination MAC address to be the global destination MAC address when in a normal operating state and to be the predetermined locally administered destination MAC address when in a low power state.

17. The logic of claim 15, and further comprising logic that generates the locally administered MAC address by setting at least one bit in a field of the global destination MAC address to a predetermined value.

18. The logic of claim 16, and further comprising logic that switches the operating state from the normal operating state to the low power operating state in response to a low power event, and such that the network controller is responsive only to packets addressed to the predetermined locally administered destination MAC address when in the low power state.

19. The logic of claim 18, and further comprising logic that is responsive to reception of a network packet that is addressed to the predetermined locally administered destination MAC address to switch from the low power state to the normal operating state.

20. The logic of claim 18, and further comprising logic that is responsive to reception of a network packet that comprises a low power command that corresponds to the low power event.