Wireless network guide
- 2. Introduction What is a wireless network? A technology that enables two or more entities to communicate without network cabling
- 3. Different Wireless Networks IrDA (Infrared Data Association) Uses beams in the infrared light spectrum Bluetooth Uses 2.45 gigahertz radio waves, but emits weak signals Limits distance to 10 feet, but travels through walls HomeRF (SWAP) – developed by businesses 6 voice channels and 1 data channel Slow, and limited range, but cheap
- 4. Wireless Fidelity (Wi-Fi) Essentially, this technology is a variation of the IEEE 802.11 specification known as 802.11b Focuses on Direct-Sequence Spread Spectrum (DSSS) High data rate (max of 11 Mbps) In the case of interference, speed drops in halves (11 Mbps to 5.5 Mbps to 2 Mbps to 1 Mbps)
- 5. Wi-Fi Advantages: Fast (11 Mbps) Reliable Long Range (up to 1000 ft outdoors, 400 ft indoors) Easy integration to wired networks Compatible with original 802.11 DSSS standard Disadvantages: Speed may fluctuate
- 6. 802.11a vs. 802.11b Frequency 802.11b transfers at 2.4 gigahertz 802.11a transfers at 5 gigahertz Coverage Distance 802.11b goes about 400 feet indoors 802.11a goes about 60 feet indoors Need more access points to cover a location Compatible to each other? Not yet.
- 7. ITL Wireless Equipment 2 Wireless Access Point Routers (with built in 4 port switch) Wired Equivalent Privacy (WEP) available 8 Wireless PCMCIA Cards 4 ORiNOCO Gold 11 Mbps PC Cards 4 3Com 11 Mbps PC Cards
- 8. Wireless Access Point LINKSYS Model No. BEFW11S4 ver. 2 Supports IEEE 802.3 (10BaseT) IEEE 802.3u (100BaseTX) IEEE 802.11b (Wireless) Built-in router capability Obtains a Clarkson IP and uses DHCP Built-in 4 port switch Fully-configurable through simple web interface
- 9. Wireless Cards 11Mbs 802.11b compatible 4 3Com Cards Model No. 3CRWE62092A 4 ORiNOCO (Lucent) Cards Model No. 012352/G
- 10. Performance Inside Range anywhere except in bathrooms Usually 11 Mbps connection Outside Range To the SC lecture wing door (closest to ERC) Covers faculty lot next to ERC Half way to Rowley Connection slows as move away from access point
- 11. Summer Research Protocol Method of Communication Spoken Language Networked Programs (AIM) HTTP, Telnet, FTP
- 12. Two Main Protocols (Internet) UDP (User Datagram Protocol) Fast, bare-bones, not reliable or friendly Can lose data at any time TCP (Transmission Control Protocol) Slower, many features, very reliable All data will get to the other side
- 13. How Can I Secure My Wireless Network Here’s a complete guide to secure your wireless network. Check this Wireless Network Guide now.