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Wireless Networking (History (802.11-1997 (The ORIGINAL wireless protocol)…
Wireless Networking
History
802.11-1997
The ORIGINAL wireless protocol
802.11a
One of two amendments to the original 802.11 specification released simultaneously
802.11b
Second of two amendments released in 1999
802.11a and b
Both introduced at the same time
802.11a
Faster
More expensive to manufacture
Operated in 5Ghz band
Mainly used in industrial settings
802.11b
Slower
Cheaper to manufacture
Operated in 2.4Ghz band.
Mainly used in residential settings
802.11g
Pretty much the most common wireless network in use today.
802.11n
Newest member of the 802.11 family.
Has rated 600Mbit/s bandwidth
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
Compatible to each other?
Not yet.
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
What is..
A technology that enables two or more entities to communicate without network cabling
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
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)
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, Compatible with original 802.11 DSSS standard
Disadvantages:
Speed may fluctuate