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USSD

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- USSD (Unstructured Supplementary Service Data) is a Global System for Mobile(GSM) communication technology that is used to send textbetween a mobile phone and an application program in the network. Applications may include prepaid roaming or mobile chatting.

USSD is similar to Short Messaging Service (SMS), but,unlike SMS, USSD transactions occur during the session only. With SMS, messagescan be sent to a mobile phone and stored for several days if the phone is notactivated or within range.

The Wireless Application Protocol (WAP) supports USSD. USSDis defined in the GSM standard documents GSM 02.90 and GSM 03.90.

Learn more about WLAN Standards

802.11 protocols: Learn about the newest wireless protocol, 802.11n, as well as how to evaluate which protocol is best for your environment. You also get a run-down of 802.11a, 802.11b and 802.11g.
802.11 protocols: Learn about the newest wireless protocol, 802.11n, as well as how to evaluate which protocol is best for your environment. You also get a run-down of 802.11a, 802.11b and 802.11g.
Wireless LAN vulnerabilities: Learn about common wireless LAN vulnerabilities and how a few best practices can change wireless LAN issues from a problem into a helpful tool for any enterprise.
Wireless LANs -- 'CCNA Official Exam Certification Library, Third Edition,' Chapter 11: Learn about wireless LAN (WLAN) technology in preparation for the CCNA exam in this excerpt from the CCNA Official Exam Certification Library, Third Edition.
Introduction to wireless networks -- from 'The book of wireless': Learn about the standards and specifications that control wireless networks and explains how data moves through the network from one computer to another.
Wireless protocols learning guide: Wireless protocols, technologies and deployment issues such as access points, security and troubleshooting are found in this basic intro to wireless protocols and technologies.

CONTRIBUTORS:	Eduardo Gonzalez
LAST UPDATED:	18 Apr 2007

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More resources from around the web:

-	Mobile USSD provides additional information.
-	MobileIN.com also provides additional information.

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