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Cisco Wireless LAN Controller Configuration Guide
OL-8335-02
Chapter 1 Overview
Power over Ethernet
Power over Ethernet
Lightweight access points can receive power via their Ethernet cables from 802.3af-compatible Power
over Ethernet (PoE) devices, which can reduce the cost of discrete power supplies, additional wiring,
conduits, outlets, and installer time. PoE also frees installers from having to mount Cisco 1000 series
lightweight access points or other powered equipment near AC outlets, providing greater flexibility in
positioning Cisco 1000 series lightweight access points for maximum coverage.
When you are using PoE, the installer runs a single CAT-5 cable from each lightweight access point to
PoE-equipped network elements, such as a PoE power hub or a Cisco WLAN Solution Single-Line PoE
Injector. When the PoE equipment determines that the lightweight access point is PoE-enabled, it sends
48 VDC over the unused pairs in the Ethernet cable to power the lightweight access point.
The PoE cable length is limited by the 100BASE-T or 10BASE-T specification to 100 m or 200 m,
respectively.
Lightweight access points can receive power from an 802.3af-compliant device or from the external
power supply.
Pico Cell Functionality
A Pico Cell is a small area of wireless provisioning provided by antenna, which allows for a dense
high-bandwidth deployment for installations such as stock exchanges. Pico Cell wireless configurations
require a specific supplicant to function correctly with Pico Cell environments. Off-the-shelf laptop
supplicants are not supported.
Note Do not attempt to configure Pico Cell functionality within your wireless LAN without consulting your
sales team. Non-standard installation is not supported.
Note Do not change the configuration database setting unless you are committing to a Pico Cell installation
or without the advice of Cisco technical support.
Pico Cell functionality includes optimization of the operating system (operating system) to support this
functionality as follows:
• The Cisco WCS Pico Cell Mode parameter reconfigures operating system parameters, allowing
operating system to function efficiently in pico cell deployments. Note that when the operator is
deploying a pico cell network the operating system must also have more memory allocated (512 to
2048 MB) using the config database size 2048 CLI command.
• Client mobility between multiple mobility domains when such exist.
• Addition of a WPA2 VFF extension to eliminate the need to re-key after every association. This
allows the re-use of existing PTK and GTK.
• With WPA2 PMK caching and VFF, the PMK cache is transferred as part of context transfer prior
to the authentication phase. This allows expedited handoffs to work for both intra- and inter-Cisco
Wireless LAN Controller roaming events.
• A beacon/probe response that allows a Cisco 1000 Series lightweight access point to indicate which
Cisco Wireless LAN Controller it is attached to so that reauthorization events only occur when
needed, minimizing inter-Cisco Wireless LAN Controller handoffs and thus reducing CPU usage.