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Introduction, Specifications & Technology

October 3rd, 2003 7:23 pm - Doc | [ Bottom ]

Date Written:

10/3/2003

Manufacturer: X-micro

Author: Aleksandr Kagan

Introduction:

As we enter into a wireless era, we begin looking for different ways to connect to the Internet. For mobile users, most current laptops have some kind of built in WLAN capability or a PC Card slot for WLAN cards. For desktop users, it was never as easy to connect to a WLAN since it was required to open up a computer. X-micro came up with a way to have access to a WLAN with almost one step, by inserting the USB Adapter into any USB slot, that applies to any laptop user or a desktop user. Now we can enjoy the internet around the house without making holes in the walls for the famous RJ45 cable.

Specifications:

IEEE 802.11b
Interface: USB 1.1
Frequency: 2.4~2.4835 GHz
Power: 5V DC
Transfer rates (Max): 11/5.5/2/1/fully auto Mbps

System Requirements:

PC-compatible computer, CPU speed of 200 Mhz or above
Memory: 64MB or above, 128MB recommended
Microsoft Windows 98SE/ME/2000/XP/Linux

Technology:

There are several specifications in the 802.11 family:

802.11 -- applies to wireless LANs and provides 1 or 2 Mbps transmission in the 2.4 GHz band using either frequency hopping spread spectrum (FHSS) or direct sequence spread spectrum (DSSS).
802.11a -- an extension to 802.11 that applies to wireless LANs and provides up to 54 Mbps in the 5GHz band. 802.11a uses an orthogonal frequency division multiplexing encoding scheme rather than FHSS or DSSS.
802.11b (also referred to as 802.11 High Rate or Wi-Fi) -- an extension to 802.11 that applies to wireless LANS and provides 11 Mbps transmission (with a fallback to 5.5, 2 and 1 Mbps) in the 2.4 GHz band. 802.11b uses only DSSS. 802.11b was a 1999 ratification to the original 802.11 standard, allowing wireless functionality comparable to Ethernet.
802.11g -- applies to wireless LANs and provides 20+ Mbps in the 2.4 GHz band.

Here we have a clear view of the 802.11 technology.

�	802.11a	802.11b	802.11g
Spectrum	5GHz	2.4GHz	2.4GHz
Data-capacity	54Mbps (72Mbps)	11Mbps	54Mbps
Throughput	25-27Mbps	5-6Mbps	25-27Mbps
Signal range	50-70m	100m	100m
Capacity	8-12 channels	3 channels	3 channels
Audio Support	Yes	No	No
Approved by IEEE	September 1999	September 1999	November 2001

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