THE WHATIS.COM WORD-OF-THE-DAY August 4, 2004 Complementary Code Keying
_____________ SPONSORED BY: SearchSecurity.com Security Alert e-newsletters Receive timely information on hard-hitting security vulnerabilities including mitigation strategies with SearchSecurity's Security Alert e-newsletter. http://searchsecurity.techtarget.com/registerProfile/1,291003,sid14,00.html?track=NL-34&ad=488413 ______________________ TODAY'S WORD: Complementary Code Keying Read our complete definition with hyperlinks at http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci996605,00.html?track=NL-34&ad=488413 Complementary Code Keying (CCK) is a modulation scheme used with wireless networks (WLANs) that employ the IEEE 802.11b specification. In 1999, CCK was adopted to replace the Barker code in wireless digital networks. A complementary code contains a pair of bit sequences of equal length, such that the number of pairs of identical elements (1s or 0s) with any given separation in one sequence of bits is equal to the number of pairs of unlike elements having the same separation in the other sequence of bits. A network using CCK can transfer more data per unit time for a given signal bandwidth than a network using the Barker code, because CCK makes more efficient use of the bit sequences. Wireless networks using the 802.11b specification employ CCK to operate at data speeds of up to a theoretical maximum of 11 Mbps in the radio-frequency (RF) band at 2.400 GHz to 2.4835 GHz. Networks using the 802.11g specification employ CCK when operating at 802.11b speeds. At higher speeds (up to a theoretical maximum of 54 Mbps), 802.11g WLANs use a more sophisticated modulation scheme called orthogonal frequency division multiplexig (OFDM). This is the modulation method used by 802.11a WLANs in the RF band at 5.725 GHz to 5.850 GHz. ______________________ RELATED TERMS: wireless LAN http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci213379,00.html?track=NL-34&ad=488413 802.11b http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci892752,00.html?track=NL-34&ad=488413 orthogonal frequency division multiplexing http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci523666,00.html?track=NL-34&ad=488413 ______________________ SELECTED LINKS: SearchMobileComputing.com provides a Wireless Learning Guide. http://searchmobilecomputing.techtarget.com/originalContent/0,289142,sid40_gci929575,00.html?track=NL-34&ad=488413 Intersil offers a paper that describes Complementary Code Keying in detail. http://www.eetasia.com/ARTICLES/2001MAY/2001MAY25_NTEK_DSP_AN.PDF _____________________ TODAY'S TECH NEWS: LINUXWORLD: IBM DELIVERS 64-BIT BLADE SERVER FOR LINUX The window is wide open for Linux developers as IBM's 64-bit blade server makes its debut. http://searchenterpriselinux.techtarget.com/originalContent/0,289142,sid39_gci996571,00.html?track=NL-34&ad=488413 MICROSOFT FIXES INTERNET EXPLORER FLAWS The fix addresses Internet Explorer security holes exploited by Download.ject and other malicious code. http://searchsecurity.techtarget.com/originalContent/0,289142,sid14_gci996525,00.html?track=NL-34&ad=488413 64-BIT WINDOWS FOR THE PRICE OF 32 Microsoft has signaled its plans to let buyers of a 32-bit version of Windows upgrade to a future 64-bit version of Windows Server 2003 for free. http://searchwin2000.techtarget.com/originalContent/0,289142,sid1_gci996530,00.html?track=NL-34&ad=488413 >> Catch up on all the latest IT news at http://searchtechtarget.techtarget.com?track=NL-34&ad=488413 ______________________ SECRET WORD-OF-THE-DAY A tricky manoeuver at the beach? No, it's a relatively simple but fairly effective way to access someone's private information. What is it? http://searchsecurity.techtarget.com/gDefinition/0,294236,sid14_gci802244,00.html?track=NL-34&ad=488413&offer=SWOD ______________________ GEEK TRIVIA QUESTION OF THE DAY We say once in a blue moon to mean not very often. It actually happens at an average rate of once every 2.5 years, but what exactly is a blue moon? >> See answer http://www.obliquity.com/astro/bluemoon.html ______________________ ABBREVIATION QOTD Another name for superstring theory, which seeks to reconcile seeming contradictions between the Theory of Relativity and quantum theory, is sometimes abbreviated as TOE. What does TOE stand for? a. the Theory of Everything b. the Theory of Encompassment >> See answer http://searchsmallbizit.techtarget.com/sDefinition/0,,sid44_gci341514,00.html?track=NL-34&ad=488413&offer=QOTD ______________________________ RECENT ADDITIONS AND UPDATES (1) Complementary Code Keying http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci996605,00.html?track=NL-34&ad=488413 (2) hot zone http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci996039,00.html?track=NL-34&ad=488413 (3) megapixel http://searchsmallbizit.techtarget.com/sDefinition/0,,sid44_gci995969,00.html?track=NL-34&ad=488413 (4) URL shortener http://searchsmallbizit.techtarget.com/sDefinition/0,,sid44_gci995868,00.html?track=NL-34&ad=488413 (5) bluesnarfing http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci952393,00.html?track=NL-34&ad=488413 _______________________________ Expert Answer Center Come get fast answers to your IT questions! 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