[AI] Asymmetric Digital Subscriber Line (ASDL), OpenSocial, and much much more!

Tech Dose of the Day vishnuhappy at yahoo.com
Tue Jun 17 05:48:49 EDT 2008


Asymmetric Digital Subscriber Line (ASDL)
Dosed by Venkat Viswanathan (from MphasiS Software Services)
What is an ADSL?
Asymmetric Digital Subscriber Line (ADSL) is a form of DSL, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voice band modem can provide. It does this by utilizing frequencies that are not used by a voice telephone call. A splitter - or micro-filter - allows a single telephone connection to be used for both ADSL service and voice calls at the same time. Because phone lines vary in quality and were not originally engineered with DSL in mind, it can generally only be used over short distances, typically less than 3 miles (5.5 km).
In India, MTNL and BSNL provide Internet over ADSL.
How does it work?
The service makes use of your existing telephone line. It splits into two channels, one for voice communications and the other for the high speed data connection. It makes use of frequencies between 25 KHz and around 1.1 MHz which is very much higher than normal voice communications.
Further References
http://en.wikipedia.org/wiki/ADSL
http://www.webopedia.com/TERM/A/ADSL.html
http://electronics.howstuffworks.com/dsl1.htm

OpenSocial
Dosed by Baskar P – M & E Team (from MphasiS Software Services)
What is OpenSocial?
OpenSocial is a set of common APIs developed by Google for implementing Social Network System into Web-applications. OpenSocial APIs are interoperable with any other Social Network System that support them. OpenSocial consists of both JavaScript APIs and Google Data APIs.
OpenSocial is a set of three common APIs, defined by Google with input from partners, that allow developers to access core functions and information at social networks:
• Profile Information (user data)
• Friends Information (social graph)
• Activities (things that happen, News Feed type stuff)
These APIs are created with maximum flexibility.
What is its usefulness?
OpenSocial APIs are built based on Google Gadgets framework. By using standard HTML and Javascript in a web-application, OpenSocial can be implemented easily in to the application by simple client-side Javascript and can access third party Social Network System and its features. Web application developers can create apps using the OpenSocial model and they will be able to run on dozens of different social networking sites. OpenSocial is largely based on open standards and there's only minor developer lock-in. It uses the essential browser open standards of XML, HTML, Javascript, and the data formats are all ATOM and RESTful/WOA.
Developers only have to learn the APIs once in order to build applications that work with any OpenSocial-enabled website. Any website can implement OpenSocial, developers have a broad distribution network to reach users. Websites also benefit by engaging a much larger pool of third party developers than they could without a standard set of APIs.
Further References
http://en.wikipedia.org/wiki/Open_Social
http://www.google.com/intl/en/press/pressrel/opensocial.html


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