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Extreme Networks Technical Brief

Enterprise Wireless LANs (WLANs) are increasingly being

deployed to access mainstream applications. One of the key

applications is to deploy Voice over Wireless LAN (VoW-

LAN) services for the mobile workforce. Worker productiv-

ity and enhanced customer service are the key drivers for

such a move. However, existing WLAN solutions have not

been able to scale in capacity and performance to enable

large scale VoWLAN deployment. In addition, VoWLAN

services demand the same level of reliability users have

come to expect from landline voice services.

With the Summit WM 4.0 release, enterprise customers can

conﬁdently deploy large scale reliable VoWLAN services

across the network, without impacting the performance of

existing legacy data services over the same network. The

Summit WM VoWLAN solution is standards-based, which

ensures interoperability with a variety of VoWLAN handsets

and client applications. This provides customers with

extreme ﬂexibility in designing the appropriate end user

VoWLAN solutions.

Features in 4.0 Release

VoWLAN Enhancements

The advanced VoWLAN features include the following:

Call Admission Control (CAC)

A landline voice user wishing to make a call waits for a dial

tone before dialing the number. The dial tone is a signal to

the user that the voice network is available to make a call. If

the network was extremely busy, the user would be unable

to get a dial tone for sometime.

Now transfer the same analogy to VoWLAN services.

Currently, WLAN data services are provided on a Best

Effort basis. There is usually minimal impact to the data

applications due to network latency; however a latency-

sensitive application like voice or video demands low

latency and guaranteed bandwidth across the network. In

order to ensure good quality, the network has to verify that

it has the required bandwidth and resources to accept a

voice call requiring a deﬁned Quality of Service (QoS). If the

network has the required resources, the call is admitted.

This prevents oversubscription of network resources, which

can lead to breaking established QoS sessions, and drastic

degradation of overall performance.

The Summit WM 4.0 CAC feature is implemented per IEEE

802.11e Trafﬁc Speciﬁcations (TSPEC). TSPEC is the trafﬁc

stream management entity which provides the management

link between higher layer QoS protocols such as IntServ or

DiffServ with the 802.11e channel access functions. TSPEC

describes characteristics of trafﬁc streams, such as data

rate, packet size, delay and service interval. TSPEC

negotiation between peer WLAN MAC layers provides the

mechanism for controlling admission, establishment,

adjustment and removal of trafﬁc streams.

To initiate a call, the client sends a request to the Access

Point (AP) via ADD Trafﬁc Stream (ADDTS) Request

<ADDTS Request> frame. The AP then decides to assign

the client to a queue, depending on several TSPEC param-

eters, such as data rate, packet size, delay and service

interval. If the requested queue is not available, it responds

with <ADDTS Deny>. If accepted AP responds with

<ADDTS Accept>. A denied client can request a call with a

lower priority service (eg. Best Effort) or query another AP

for admission to a particular queue.

With 4.0, Summit WM software allows administrators to

conﬁgure the number of clients allowed on an AP with

either voice or video priorities. Clients that do not support

CAC can still be associated with the AP for best effort

service. Therefore, it makes sense to put “intelligent” clients

that support CAC on a separate Access Domain from clients

that do not support CAC. Figure 1 shows an example of

CAC feature operation.

Summit

WM100 and Summit WM1000 4.0 Release

1 2 3 4 5 6

Résumé du contenu

Page 1 - Features in 4.0 Release

Extreme Networks Technical BriefEnterprise Wireless LANs (WLANs) are increasingly being deployed to access mainstream applications. One of the key app

Page 2 - ADDTS = Add Traffic Stream

Page 3 - Corporate

Page 4 - Availability Enhancements

Page 5 - External Captive Portal (ECP)

Page 6 - Product Structure

Extreme Networks Technical Briefwww.extremenetworks.com email: [email protected] North AmericaExtreme Networks, Inc.3585 Monroe Str

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Extreme Networks Summit WM1000 Manuel d'utilisateur

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