Twin-core, copper-core, insulated, twisted, oxygen-free, piano, coaxial, armored and optical: wires and cables are great, but working without them is better.
The PC and the mobile phone have, between them, driven two significant wireless standards into our home.
802.11 is a cellular wireless protocol designed primarily for wire-free communication networking. The current standard is 802.11g which, when introduced in 2002, combined the benefits of the two earlier standards, 802.11a and 802.11b.
Unlike 802.11A, which also supported a data transfer rate of 54Mbps, 802.11g uses an unregulated frequency at 2.4GHz which gives a far better range than 11A's regulated 5GHz frequency did, but is also more likely to suffer interference from things like microwaves and cordless phones, or indeed anything that uses this free-for-all frequency.
Blutooth would probably have had far less impact on the PC were it not for mobile phones. Rather than being designed for coverage of relatively large areas, Bluetooth was primarily a short-range means for devices to talk directly to each other. Printers, laptops, headsets, fax machines, PDAs, keyboards and more can all be operated and allowed to communicate with each other using the Bluetooth protocol.
Bluetooth operates in the same unregulated frequency band at 2.45GHz and is thus also susceptible to interference for other devices. Of course the way Bluetooth deals with this issue is by using relatively low powered signals with an average range of just 10 metres. This combined with the rapid 1600Hz frequency switching and resulting small, rapid data packets mean actual interference is quite rare.
Just in case you care, the term Bluetooth comes from the name of Harold Bluetooth Gormson, king of Denmark around 958BC. He apparently united Denmark with part of Norway before introducing christianity to the area. The name reflects the importance of this part of the world in the communications industry as well as symbolising the process of unification.
If you own a PC and a Bluetooth enabled mobile phone, then chances are that like me you also own a Bluetooth dongle, a small USB powered transceiver that allows you to transfer pictures, ringtones, contact details and so on back and forth between your phone and your PC. I'm also guessing that, like me again, you've managed to loose it more than once or twice.
So with Bluetooth adoption on the increase and the benefits of wireless LANs suddenly spawning home networks all around the world, it seems thoroughly sensible that someone should combine both features into a single product, and that someone sensible just happens to be MSI.
Today I'm looking at their 802.11b/g and Bluetooth enabled networking card which, quite aptly, is named DualNet.
As usual the specs:
|Wireless Data Rates
• OFDM: 54,48,36,24,18,12,9 and 6 Mbps
• DQPSK:2 Mbps
• DBPSK:1 Mbps
||119.9mm x 83.15 mm
||Storage Temperature : -20°C ~ 100°C
Operating Temperature : 0°C ~ 60°C
||• Initialization Current <= 130 mA
• Receive Mode <=240 mA
• Transmit Mode <= 440mA
||2.4 GHz ~ 2.4835 GHz
||• EIRP <=20 dBm
• Output Power(Before Antenna)
= 14 ± 1 dBm(IEEE 802.11g)
• Output Power(Before Antenna)
= 17 ± 1 dBm(IEEE 802.11b)
|Wireless Transmission Power
|Bluetooth Spec Compliance
Around 723 Kbps(data channels)
5V from PCI interface
FHSS (Frequency Hopping Spread Spectrum)
|Output Power Class
||Bluetooth Power Class 2
||Windows XP, Windows 2000,Windows ME, Windows 98SE