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Voice over Wireless LAN Solution Guide v1.0 December 2005
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QoS over the air techniques generally require complementary feature support by client and AP
alike, which means that some legacy devices or products that are slower to implement certain
features ultimately can impact the overall solution for voice with respect to QoS. The Hybrid
Coordination Function (HCF) is designed to smooth this transition by supporting a combination of
channel access methods, both new and legacy. However, it will be very challenging in the future
to attempt to support HCF Controlled Channel Access (HCCA)-based VoWLAN devices (future
802.11e), which are deterministic, alongside Enhanced Distributed Channel Access (EDCA)-
based (WMM) VoWLAN devices while providing sufficient quality to the latter group.
1.2 Scope of document
This solution guide does not encompass every WLAN product in the broader portfolio, nor does it
feature a number of LAN infrastructure components. The scope is defined as below.
1.2.1 Products Included
This solution guide addresses the following Nortel products:
WLAN Security Switch (WSS) 2300 series and WLAN Access Point 2330 (Release 4.0)
Ethernet Switch (ES) 460-24T-PWR and Ethernet Routing Switch (ERS) 5520
Ethernet Routing Switch (ERS) 8600 and Ethernet Routing Switch (ERS) 8300
WLAN Handsets 2210, 2211, and 2212
WLAN Telephony Manager 2245 and WLAN Application Gateway 2246
IP Softphone 2050 (PC)
Mobile Voice Client 2050 (PDA)
Multimedia Communication Server (MCS) 5100 and MCS Client
Communication Server 1000 (Release 4.0), Meridian 1 PBX (Release 4.0), and Business
Communications Manager (BCM) (Release 3.7)
1.2.2 Infrastructure components
This document covers in general terms topologies that include supported third-party AP products,
but does not address the configuration of those devices. In addition to the network equipment,
certain support devices, such as WLAN Management System (WMS) 2300, Enterprise Network
Management System (ENMS), Dynamic Host Configuration Protocol (DHCP) servers, and
Domain Name System (DNS) servers are addressed as well.
1.2.3 Configurations not included
This document does not currently address VoWLAN products in combination with WLAN Access
Point 2220/2221, WLAN Security Switch 2250, or Adaptive WLAN 2200 series. It does not
address networks that include Ethernet Switch (ES) 8100, Ethernet Routing Switch (ERS) 1424T,
or Ethernet Routing Switch (ERS) 1600 series.
2. Nortel VoWLAN solution
Due to the volume of material on the subject, the guide is organized in a topical manner. For
example, redundancy and security are treated separately, each imposing its own restrictions and
recommendations on the network. This section describes the basic architecture and some typical
design scenarios.