Cisco WIRELESS LAN CONTROLLER OL-17037-01 User Manual download pdf (Page 71)

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Cisco Wireless LAN Controller Configuration Guide

OL-17037-01

Chapter 7 Controlling Lightweight Access Points

Configuring Power over Ethernet

Step 3 To clear the current, minimum, and maximum link latency statistics on the controller for a specific access

point, enter this command:

config ap link-latency reset Cisco_AP

Step 4 To view the results of the reset, enter this command:

show ap config general Cisco_AP

Configuring Power over Ethernet

When an access point that has been converted to lightweight mode (such as an AP1131 or AP1242) or a

1250 series access point is powered by a power injector that is connected to a Cisco pre-Intelligent Power

Management (pre-IPM) switch, you need to configure Power over Ethernet (PoE), also known as inline

power.

The dual-radio 1250 series access points can operate in four different modes when powered using PoE:

• 20.0 W (Full Power)—This mode is equivalent to using a power injector or an AC/DC adapter.

• 16.8 W—Both transmitters are used but at reduced power. Legacy data rates are not affected, but the

M0 to M15 data rates are reduced in the 2.4-GHz band. Throughput should be minimally impacted

because all data rates are still enabled. The range is affected because of the lower transmit power.

All receivers remain enabled.

• 15.4 W—Only a single transmitter is enabled. Legacy data rates and M0 to M7 rates are minimally

affected. M8 to M15 rates are disabled because they require both transmitters. Throughput is better

than that received with legacy access points but less than the 20 and 16.8 W power modes.

• 11.0 W (Low Power)—The access point runs, but both radios are disabled.

These modes provide the flexibility of running the 1250 series access points with the available wired

infrastructure to obtain the desired level of performance. With enhanced PoE switches (such as the Cisco

Catalyst 3750-E Series Switches), the 1250 series access points can provide maximum features and

functionality with minimum total cost of ownership. Alternatively, if you decide to power the access

point with the existing PoE (802.3af) switches, the access point chooses the appropriate mode of

operation based on whether it has one radio or two.

Note For more information on the Cisco PoE switches, refer to this URL:

http://www.cisco.com/en/US/prod/switches/epoe.html

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Cisco WIRELESS LAN CONTROLLER OL-17037-01 User Manual Page 71