SEMINAR ON VOICE OVER

WIRELESS LAN

MARODE DNYANESHWAR D. B.E.(E&C)

Wireless LAN Voice over WLAN Working Application Advantages Challenges Summary

OUTLINE

WIRELESS LAN

INTERNET CONNECTION BASED ON WLAN

Wireless LANs (WLANs) are LANs that use RF

instead of cable or optical fiber. Allows high-speed data transfer without wires

or cables. Supports typical enterprise applications (e-

mail, file transfer, audio/video conferencing, & so on).

Has the great advantage of roaming.

Wireless LAN

All components that can connect into a wireless

medium in a network are referred to as stations. All stations are equipped with wireless network

interface cards(WNICs). Wireless stations fall into one of two categories:

access points (APs), and clients. APs are base stations for the wireless network. Clients can be Laptops, IP-phones, desktops

enabled with wireless network interface.

Important terms related to WLAN

Uses radio or infrared or microwave transmission for

communication without cables. For communication any of these three technology is

used.1. Frequency Hoping Spread Spectrum (FHSS).2. Direct Sequence Spread Spectrum (DSSS).3. Infrared (IR).

TECHNOLOGY USED IN WLAN

Wireless LAN Topologies

Star configuration using wireless distribution system

Chain configuration using Wireless Distribution System

Ring configuration using wireless distribution system

Integrates two technologies IP telephony &

WLAN. Application related to high quality voice &

data communication. Provides the liberty to roam in the local area

without loosing the connectivity. Saves in-building cell phone usage fees by

integrating VOWLAN on existing LAN.

VOICE OVER WIRELESS LAN

• WLAN handsets are connected to WLAN through

AP(Access Points) as Wireless Interface Network devices are connected.

• WLAN handsets are integrated to IP Telephony call server to provide high quality voice and data communication.

CONNECTION DETAILS

WLAN at Different Places

In the organization the mobile device accesses VoIP server and e.g. Lotus Same time , Microsoft RTC Server.

On the road VoIP and other real time communications is handled by mobile networks. 3G r5 and r6 have native VoIP.

At home the mobile device uses via WLAN local or enterprise VoIP service, Skype.

VoIP service

Mobile network

Intranet

Internet

Home

WLAN

Enterprise VoIP server

WLAN

Other communications server

WLAN-mobile roaming (UMA)

PublicWLAN

VoWLAN DEVICE TYPES

Softphones for PDAs 802.11 handsets Integrated

GSM/3G/WLAN/devices

Health care Retail Education Hotels Government establishments and so on.

APPLICATIONS

• Need latest Technology• Well trained workers• Complications

CHALLENGES

Office mobility, Quick installation, Cost effective alternative, Minimal infrastructure costs, Promising solutions to challenges.

Advantages

Organizations are moving rapidly to adopt VoWLAN solutions to enhance business communication and boost employee productivity while leveraging their existing investment in WLAN and VoIP infrastructures.

To ensure that those moves are successful, businesses require solutions that can provide the necessary reliability, enterprise-class security, and QoS requirements.

SUMMARY