Network & IT Ops - Week 4. Basic Wireless Concepts and Configuration Part I. Basic Wireless Concepts and Configuration. The Wireless LAN. Why Use Wireless?. Business networks today are evolving to support people who are on the move.
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Basic Wireless Conceptsand ConfigurationPart I
The Wireless LAN
Silver and Diamond Cell Phone $1.3Million
Wind Energy Cell Phone Charger
Note: Values are estimates and do not reflect actual pricing.
Network Architecture Standards
Wireless NICs tend to reduce battery life.
(Avoidance) instead of CSMA/CD
Different Frame Format
Wireless Access Points (AP) instead of a switch.
Client with Wireless NIC
Wireless Access Point (AP)
Final ratification expected in November, 2009
Remember, stations actually communicate through the Access Point. The access point has a single channel for all traffic.
802.11g is backward compatible with 802.11.b.
Mixed mode supports both.
Several access points can share an SSID.
A shared service set identifier (SSID) is a unique identifier that client devices use to distinguish between multiple wireless networks in the same vicinity.
Alphanumeric, case-sensitive, from 2 to 32 characters.
5 MHz overlap
The IEEE 802.11 standard establishes thechannelization scheme for the useof the unlicensed ISM RF bands in WLANs.The 2.4 GHz band is broken down into11 channels for North Americaand 13 channels for Europe.
3 Access Points
Many access points can automatically select a channel based on adjacent channel use.Some products continuously monitor the radio space to adjust the channel settings dynamically in response to environmental changes.
Best practices for WLANs that require multiple access points are set to use non-overlapping channels.
Each arc represents 1 channel.
Basic Service Area
Different MAC Addresses
= different BSSIDs.
The only part of the process that may be broadcast on a regular basis. Not necessarily enabled.
Number of Access Points
20,000 Sq. Ft.
(1860 Sq. Meters)
Minimum of 6 Mbps 802.11b throughput for each Basic Service Area (BSA)
Can be achieved with a coverage area of 5,000 Sq. Ft. (465 Sq. Meters)
20,000 Sq. Ft. with a coverage of 5,000 Sq. Ft. results in 4 Access Points.
Dimension of Coverage Area
50 foot (15 Meter) Radius
71 foot (22 Meter) Square
Location of Access Points