THE WHATIS.COM WORD-OF-THE-DAY November 28, 2002 bit stuffing ______________ TODAY'S SPONSOR: VeriSign - The Value of Trust
Secure all your Web servers now - with a proven 5-part strategy. The FREE Server Security Guide shows you how to: - DEPLOY THE LATEST ENCRYPTION and authentication techniques - DELIVER TRANSPARENT PROTECTION with the strongest security without disrupting users. And more. Get your FREE Guide now: http://WhatIs.com/r/0,,7806,00.htm?freeguide ______________ TODAY'S WORD: bit stuffing See our definition with hyperlinks at http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci214383,00.html Bit stuffing is not to be confused with bit robbing. In telecommunication, bit stuffing is the addition of a small number of binary digits to a transmission unit in order to fill it up to a standard size or to help synchronize signaling rates between points in a network. The receiver knows how to detect and remove or disregard the stuffed bits. For example, the timing or bit rate of T-carrier system signals is constantly synchronized between any terminal device and an adjacent repeater or between any two repeaters. The synchronization is achieved by detecting the transition in polarity for 1 bits in the data stream. (T-1 signalling uses bipolar signaling, where each successive bit with a value of 1 is represented by voltage with a reverse polarity from the previous bit. Bits with a value of 0 are represented by a no-voltage time slot.) If more than 15 bits in a row are sent with a 0 value, this "lull" in 1 bits that the system depends on for synchronization may be long enough for two end points to become out of synchronization. To handle this situation (the sequence of more than 15 0 bits), the signal is "stuffed" with a short, unique bit pattern (which includes some 1 bits) that is recognized as a synchronization pattern. The receiving end removes the stuffed bits and restores the bit stream to its original sequence. RELATED TERMS: bit robbing. http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci214388,00.html binary http://whatis.techtarget.com/definition/0,,sid9_gci211661,00.html T-carrier system http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci213096,00.html repeater http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci212890,00.html voltage http://whatis.techtarget.com/definition/0,,sid9_gci213320,00.html ______________________ QUIZ #32 | Securing Your Network How much do you know about network security? Take our latest quiz and find out. >> Take the quiz http://searchsecurity.techtarget.com/sDefinition/0,,sid14_gci857673,00.html ______________________ CROSSWORD PUZZLE #6 | Wireless Improve your flexible thinking skills. Print out the puzzle and keep it nearby to work on throughout your day! http://whatis.techtarget.com/definition/0,,sid9_gci861329,00.html ______________________ REAL-LIFE CHALLENGE #19 | XP Pro or Win2k Pro? It's upgrade time. The branch office manager at Company X would like his staff to have "the best", which he thinks is XP Pro. The head of IT thinks that Win2k Pro is a better choice, but admits he's never worked with XP. Can you advise? http://whatis.discussions.techtarget.com/WebX?[EMAIL PROTECTED]@.1dcfae0e/169 ______________________________ RECENT ADDITIONS AND UPDATES [1] matter http://whatis.techtarget.com/definition/0,,sid9_gci865252,00.html [2] core router http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci865184,00.html [3] vertical interval time code http://whatis.techtarget.com/definition/0,,sid9_gci865178,00.html [4] plasma http://whatis.techtarget.com/definition/0,,sid9_gci864603,00.html [5] instruction http://whatis.techtarget.com/definition/0,,sid9_gci212356,00.html ____________________________________________________________________ ::::::::::::::::::: WHATIS.COM CONTACTS ::::::::::::::::::: LOWELL THING, Site Editor ([EMAIL PROTECTED]) ____________________________________________________________________ MARGARET ROUSE, Associate Editor ([EMAIL PROTECTED]) ___________________________________________________________________ :::::::::::::::::::: ABOUT THIS NEWSLETTER ::::::::::::::::::::: Published by TechTarget (http://www.techtarget.com) TechTarget - The Most Targeted IT Media Copyright 2002, All Rights Reserved. If you would like to sponsor this or any TechTarget newsletter, please contact Gabrielle DeRussy at [EMAIL PROTECTED] Unsubscribe from 'Word of the Day' - Simply Reply to this Email with REMOVE within the Body or Subject > or - Go to: http://WhatIs.techtarget.com/register - Log in to edit your profile. - Click on the link to Edit email subscriptions. - Uncheck the box next to the newsletter you wish to unsubscribe from. - When finished, click "Save Changes to My Profile."
