WESM zl Management and Configuration Guide Supplement 2007-09

2
Introduction
Licenses resident in the Wireless Edge Services zl Module, the primary
Module, determine the number of radio ports supported by a wireless services-
enabled switch. The Redundant Wireless Services zl Module does not contain
any licenses itself. As a redundant Module, it uses a primary Module’s licenses.
A license for 12 radio ports is pre-installed at the factory. Additional license
products can be purchased to increase the number of radio ports supported.
Note Up to four zl Modules (primary or redundant) may be installed in a zl switch
chassis.
General Operation
In a wireless services-enabled zl switch, the Wireless Edge Services zl Module
and the Redundant Wireless Services zl Module use ports on the switch to pass
wired and wireless traffic to and from the network. When a Module adopts a
connected ProCurve Radio Port, it downloads configuration settings and
operating instructions to it. A custom protocol encapsulates all wireless
traffic, as well as management, status, and control communications with the
radio port. WLANs, each of which is identified by a service set identifier
(SSID), are configured and managed by the Module. WLANs define various
network and security policies, including authentication and encryption, for
the wireless services provided. A Web browser interface provides easy-to-use
management for the Module and the wireless LAN.
Terminology
While the Wireless Edge Services zl Module (J9051A) and the Redundant
Wireless Services zl Module (J9052A) differ in their roles, their configuration
and support by the zl switch is nearly identical (except that a Redundant
Wireless Services zl Module does not contain any radio port licenses, so it
cannot adopt and control any radio ports on its own). Throughout this
document, the term “Wireless Edge Services zl Module” is used to refer to both
Modules, unless explicitly noted. Also, for brevity, the term “Module” is used
throughout to refer to both of these products.