Wireless Technology

Rod Harris & Roger WhiteChemeketa Community College

Salem, Oregon

Wireless Networking Today

• Home Networking

• SOHO Networking

• Enterprise Networking

• Wireless Network Security

Typical Wireless Devices

• Access-Points• Bridges• Switches• Routers• Antennas• Client Adaptors

• Laptops• PDAs• Phones• Printers• Desktop PCs• Bar Code Scanners

Cisco Wireless Devices Recommended for Wireless Curriculum

Aironet 1200 Series

Access-Point

Aironet 1100 Series

Access-Point

Aironet 1300 Series

Bridge

Cisco Client Adapters

Yagi mast or wall mount

Antenna

Diversity omnidirectional ceiling mount

Antenna

2.2-dBi dipole

antenna

Omnidirectional mast mount

Antenna

Linksys - SOHO Wireless Devices

WRT300NWireless-N Broadband

Router

WRT54GWireless-G Broadband

Router

WAP4400NWireless-N Access

Point with Power Over Ethernet

WAP54GWireless-G

Access Point

WPC54GWireless-G Notebook Adapter

WUSB54GCCompact

Wireless-G USB Adapter

WMP54GWireless-G

PCI Adapter

WPC300NWireless-N Notebook

Adapter

Typical Application of Access-Points

PC with Wireless Card

Access Point

WirelessRouter

Wireless Laptops

Access Point

Wireless Laptop

Wired Infrastructure

Backbone

PC with Wireless Card

Wireless Laptop

Wireless Bridge Applications

Wireless Bridge

IEEE 802.11 Standards - Wireless• IEEE 802.11a, provides 54Mbps data rate at 5GHz.

• IEEE 802.11b, or Wi-Fi, has a maximum data rate of 11Mbps, at 2.4GHz.

• IEEE 802.11g, provides 54Mbps data rate at 2.4GHz.

• IEEE 802.11n, a proposed standard to provide 540 Mbps data rate at 2.4 GHz or 5 GHz, using MIMO (Multiple-In, Multiple-Out)

• MIMO transmits two or more data streams in the same radio channel at the same time.

• With MIMO, the maximum data rate per channel grows linearly with the number of different data streams that are transmitted in the same channel.

Channel Assignment 1 3 5 7 9 11

2 4 6 8 10

5 10

4 9

3 8

2 7

1 6 11

2.4 GHz 2.441 GHz 2.483 GHz

Frequency

802.11b & g Extended Geographic Coverage using 3 - Channel Layout

6

61 11 1

1

1 611

11

Three non-overlapping channel frequencies in a non-adjacent configuration allows maximum coverage of a geographic area without cross channel interference and ensures complete RF coverage.

Channels 1, 6, and 11 most popular configuration for this type of layout. Other combinations are possible.

Typical Site Survey Process

• Obtain floor plan / campus site map

• Visually inspect the floor plan

• Identify user areas on the floor plan

• Identify potential problems areas on floor plan

• Identify Access-Point locations and Antenna types

• Document all findings

Typical Site Survey Tools

• Laptop or PDA with Wireless adaptor• Site Survey Software for Wireless• Access-Points• RF Analyzer• Two-Way Communication Devices• Antennas – Variety of types• Distance measuring devices• Handheld GPS device with cordinence

measurement capabilities

Campus Map used for Site Surveys

CISCO ACADEMY STANDARD EQUIPMENT BUNDLE

FWL - Ver 1.2 as of - 30 Nov 2005

Wireless Product Description Qty

802.11a/b/g triband wireless LAN Laptop client adapter 4

802.11a/b/g triband Wireless LAN Desktop client adapter 2

802.11g 1300 Series Wireless Bridge/Access-Point 2

802.11a/g dualband 1100 Series Access-Point 1

802.11a/g dualband 1200 Series Access-Point 1

802.11a 5GHz 3.5dBi articulating dipole antenna 2

802.11g 2.4GHz 2.2dBi articulating dipole antenna 6

Console Cable for 1100 & 1200 Series Access-Points 2

END