Professional IT Specialists
802.11g, Is it better??
If your wireless LAN applications require high performance, then you're probably facing a decision on whether to use 802.11a/b or wait for 802.11g. Before making the choice, you need to fully understand what both of these standards have to offer. Let's compare and contrast these two competing technologies and then see which one best fits your needs.
The 802.11g standard is still under development, with a final standard likely available by the end of 2002. With pre-standard chipsets just becoming available now, product vendors will probably release 802.11g radio cards and access points in late 2002 or early 2003.
802.11g is an extension to 802.11b, the basis of the majority of wireless LANs in existence today. 802.11g will broaden 802.11b's data rates to 54 Mbps within the 2.4 GHz band using OFDM (orthogonal frequency division multiplexing) technology. Because of backward compatibility, an 802.11b radio card will interface directly with an 802.11g access point (and vice versa) at 11 Mbps or lower depending on range. You should be able to upgrade the newer 802.11b access points to be 802.11g compliant via relatively easy firmware upgrades.
Range at 54 Mbps will likely be less than existing 802.11b access points operating at 11 Mbps. As a result, don't count on upgrading your existing access points that currently provide 11 Mbps throughout all areas. You'll probably need to move the access points closer together and include additional ones to accommodate higher data rates.
Similar to 802.11b, 802.11g operates in the 2.4GHz band, and the transmitted signal uses approximately 30MHz, which is one third of the band. This limits the number of non-overlapping 802.11g access points to three, which is the same as 802.11b. This means that you'll have the same difficulty with 802.11g channel assignment as you do with 802.11b when covering a large area where there is a high density of users. The solution of course is to lower the power of each access point, which enables you to place access points closer.
A big issue with 802.11g, which also applies to 802.11b, is considerable RF interference from other 2.4 GHz devices, such as the newer cordless phones. Companies often complain about limited wireless LAN performance when people in the facility operate cordless telephones. It possible to manage the problem by limiting sources of RF interference; however, you can't always eliminate the problem.
3 Ghz Workstations, what's the scoop?
SANTA CLARA, Calif., - Intel Corporation today introduced its fastest Intel® Xeon™ processors, exceeding 3 GHz, for dual processor servers and workstations. The company also said that more than 9,000 companies around the world are now selling components or systems based on the Intel Xeon processor family.
The Intel Xeon processor at 3.06 GHz features a 512 KB level two cache and a 533 MHz system bus and the Intel Xeon processor at 3 GHz includes a 512 KB level two cache and a 400 MHz system bus.
"Intel continues to raise the bar on system performance and manufacturing execution by delivering the first processors to exceed 3 GHz for dual processor servers and workstations to system vendors worldwide," said Richard Dracott, director of marketing for Intel's Enterprise Platforms Group. "In 2003, we will continue to enhance the Intel Xeon processor family with industry leading performance and scalability."
Systems based on Intel Xeon processors are used as general-purpose servers for Web hosting, data caching, search engines, security and streaming media, and as workstations for digital content creation, mechanical and electrical design, financial analysis, and 3D modeling.
The Intel Xeon processor at 3.06 GHz is drop-in compatible with existing systems designed with the Intel® E7501 or Intel® E7505 chipsets, which have shipped in volume since November 2002, while the Intel Xeon processor at 3 GHz is drop-in compatible with systems designed with the Intel® E7500 or Intel® 860 chipsets.
The Intel Xeon processor at 3.06 GHz and the Intel Xeon processor at 3 GHz are available worldwide. Intel's suggested list prices are $722 and $658 respectively in 1,000-unit quantities.
Intel, the world's largest chip maker, is also a leading manufacturer of computer, networking and communications products. Additional information about Intel is available at www.intel.com/pressroom