Cisco Systems 3560X Manual De Usuario
13-7
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 13 Configuring Interface Characteristics
Interface Types
10-Gigabit Ethernet Interfaces
The Catalyst 3750-X and 3560-X switches have a network module slot into which you can insert a
10-Gigabit Ethernet network module, a 1-Gigabit Ethernet network module, or a blank module.
10-Gigabit Ethernet network module, a 1-Gigabit Ethernet network module, or a blank module.
A 10-Gigabit Ethernet interface operates only in full-duplex mode. The interface can be configured as a
switched or routed port.
switched or routed port.
For more information about the Cisco TwinGig Converter Module, see the switch hardware installation
guide and your transceiver module documentation.
guide and your transceiver module documentation.
Power over Ethernet Ports
A PoE-capable switch port automatically supplies power to one of these connected devices if the switch
senses that there is no power on the circuit:
senses that there is no power on the circuit:
•
Cisco pre-standard powered device (such as a Cisco IP Phone or a Cisco Aironet Access Point)
•
IEEE 802.3af-compliant powered device
•
IEEE 802.3at-compliant powered device
A powered device can receive redundant power when it is connected to a PoE switch port and to an AC
power source. The device does not receive redundant power when it is only connected to the PoE port.
power source. The device does not receive redundant power when it is only connected to the PoE port.
After the switch detects a powered device, the switch determines the device power requirements and then
grants or denies power to the device. The switch can also sense the real-time power consumption of the
device by monitoring and policing the power usage.
grants or denies power to the device. The switch can also sense the real-time power consumption of the
device by monitoring and policing the power usage.
This section has this PoE information:
•
•
•
•
Supported Protocols and Standards
The switch uses these protocols and standards to support PoE:
•
CDP with power consumption—The powered device notifies the switch of the amount of power it
is consuming. The switch does not reply to the power-consumption messages. The switch can only
supply power to or remove power from the PoE port.
is consuming. The switch does not reply to the power-consumption messages. The switch can only
supply power to or remove power from the PoE port.
•
Cisco intelligent power management—The powered device and the switch negotiate through
power-negotiation CDP messages for an agreed-upon power-consumption level. The negotiation
allows a high-power Cisco powered device, which consumes more than 7 W, to operate at its highest
power mode. The powered device first boots up in low-power mode, consumes less than 7 W, and
negotiates to obtain enough power to operate in high-power mode. The device changes to
high-power mode only when it receives confirmation from the switch.
power-negotiation CDP messages for an agreed-upon power-consumption level. The negotiation
allows a high-power Cisco powered device, which consumes more than 7 W, to operate at its highest
power mode. The powered device first boots up in low-power mode, consumes less than 7 W, and
negotiates to obtain enough power to operate in high-power mode. The device changes to
high-power mode only when it receives confirmation from the switch.
High-power devices can operate in low-power mode on switches that do not support
power-negotiation CDP.
power-negotiation CDP.