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Cisco Wireless LAN Solution Product Guide
OL-7955-01
Chapter 1 Overview
Cisco Wireless LAN Controllers
Note Cisco 4400 Series Wireless LAN Controller models come from the factory with integral 19-inch EIA
equipment rack flush-mount ears.
The 4402 Cisco 4400 Series Wireless LAN Controller uses one set of two redundant front-panel
SX/LC/T SFP modules (SFP transceiver, or Small Form-factor Plug-in), and the 4404 Cisco 4400 Series
Wireless LAN Controller uses two sets of two redundant front-panel SX/LC/T SFP modules:
• 1000BASE-SX SFP modules provide a 1000 Mbps wired connection to a network through an
850nM (SX) fiber-optic link using an LC physical connector.
• 1000BASE-LX SFP modules provide a 1000 Mbps wired connection to a network through a
1300nM (LX/LH) fiber-optic link using an LC physical connector.
• 1000BASE-T SFP modules provide a 1000 Mbps wired connection to a network through a copper
link using an RJ-45 physical connector.
The following power supply module is also available:
• AIR-PWR-4400-AC — All Cisco 4400 series power supplies. One Cisco 4400 series power supply
can power Cisco 4400 series power supplies can power Cisco 4400 series power supplies, the Cisco
4400 series power supplies are redundant.
Distribution System Ports
A Distribution System (DS) port is a physical port through which controller talks to access points across
the network. DS ports are where packets are exchanged between the Cisco Wireless LAN Solution
wireless LANs and the rest of the network.
Note The Distribution System Port cannot be assigned to a dedicated controller service port.
As described in the “Layer 2 and Layer 3 LWAPP Operation” section on page 1-7, when the LWAPP
communications are set to Layer 2 (same subnet) operation, the Distribution System must have one
management interface to control all inter-controller and all controller-to-access point communications,
regardless of the number of physical Distribution System ports.
Also as described in the “Layer 2 and Layer 3 LWAPP Operation” section on page 1-7, when the LWAPP
communications are set to Layer 3 (different subnet) operation, the Distribution System must have one
management interface to control all inter-controller communications, and must have one AP-Manager
interface to control all controller-to-access point communications, regardless of the number of physical
Distribution System ports.
Each physical Distribution System port can also have between one and 512 operator-defined interfaces
assigned to it. Each operator-defined interface is individually configured, and allows VLAN
communications to exist on the distribution system port(s).
About the Management Interface
The logical Management Interface controls Layer 2 communications between Cisco Wireless LAN
Controllers and Cisco 1000 series lightweight access points.
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