System Software For Managing Power Allocation To Ethernet Ports In The Absence of Mutually Exclusive Detection And Powering Cycles In Hardware

• US 20100049999A1
• Filed: 11/05/2009
• Published: 02/25/2010
• Est. Priority Date: 05/25/2006
• Status: Active Grant

• Current Assignee: ARRIS Enterprises LLC (CommScope Holding Company, Inc.)
• Original Assignee: Foundry Networks Incorporated (Broadcom, Inc.)
• Inventors: Hansalia, Rakesh
• Granted Patent: US 8,001,397 B2
• Time in Patent Office: Days
• US Class Current: 713/300
• CPC Class Codes: H04L 12/10 Current supply arrangements
• CPC Class Codes: H04L 49/351 for local area network [LAN], e.g. Ethernet switches
• CPC Class Codes: H04L 49/40 Constructional details, e.g. power supply, mechanical construction or backplane

Abstract

A method of allocating power to ports in an Ethernet switch, including: (1) determining the available capacity of a power pool used to supply the ports, (2) assigning a configuration power to each of the ports, (3) selecting a port to be enabled, (4) determining whether the available capacity of the power pool exceeds the configuration power assigned to the selected port, and, if the available capacity of the power pool exceeds the configuration power assigned to the selected port, then (4) subtracting the configuration power assigned to the selected port from the available capacity of the power pool, (5) enabling and powering the selected port and simultaneously detecting whether the selected port is connected to a powered device, and (6) adding the configuration power assigned to the selected port to the available capacity of the power pool if the port is not connected to a powered device.

Claims

1. A method comprising:

pre-allocating a first configuration power to a first port of a switch, wherein the first configuration power defines a maximum power sourcing capacity of the first port;

determining that an available power pool of the switch is greater than the first configuration power;

then

subtracting the first configuration power from the available power pool of the switch;

then

supplying power from the available power pool to the first port and detecting whether a powered device is connected to the first port in a single indivisible operation.

2. The method of claim 1, further comprising adding the first configuration power to the available power pool upon detecting that a powered device is not connected to the first port.

3. The method of claim 2, further comprising assigning the first port to a state that indicates the first port is enabled but not powered upon detecting that a powered device is not connected to the first port.

4. The method of claim 1, further comprising setting the first port to a powered and enabled state upon detecting that a powered device is connected to the first port.

5. The method of claim 1, further comprising:

pre-allocating a second configuration power to a second port of the switch, wherein the second configuration power defines a maximum power sourcing capacity of the second port;

assigning a first priority to the first port, and a second priority to the second port;

determining that the available power pool of the switch is less than the second configuration power;

then

detecting that a first powered device is connected to the first port, wherein the first port supplies power to the first powered device;

determining that the second priority is greater than the first priority;

determining that the available power pool of the switch plus the first configuration power is greater than or equal to the second configuration power; and

disabling the first port, such that the first port does not supply power to the first powered device.

6. The method of claim 5, further comprising:

subtracting the second configuration power from the available power pool of the switch;

then

supplying power from the available power pool to the second port and detecting whether a powered device is connected to the second port in a single indivisible operation.

7. The method of claim 1, wherein the switch comprises a plurality of ports, the method further comprising pre-allocating configuration powers to each of the plurality of ports.

8. The method of claim 7, further comprising pre-allocating different configuration powers to different ports.

9. The method of claim 7, further comprising pre-allocating the same configuration power to each of the plurality of ports.

10. The method of claim 1, further comprising assigning a priority to each of the ports.

11. The method of claim 1, further comprising adding the first configuration power to the available power pool if a powered device connected to the first port is powered off, or is disconnected from the first port.