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Integrated Services Data Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network. It was first defined in 1988 in the CCITT red book.
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Definition of ISDN.
How to Work?
Types of ISDN: BRI- Basic Rate Interface PRI- Primary Rate Interface BISDN- Broadband ISDN
Communication channel B channel : media and Data D channel : Data and Controlling signals
ISDN Netwrok
PRI also have Digital service which allows entire company to show the main advertised phone number on every call
PRI digitally delivers the local, long distance, Direct Inward Dial (DID) and internet service over one 4 wire interface.
PRI connects to PBX via PRI card
BISDN- In other words Broadband Integrated Services Digital Network which is designed to handle high bandwidth applications.
Asynchronous Transfer Mode Protocol
Data Transfer rate: 155 to 622 Mbps.
Suitable for Conversational Services such as Video telephony, Video conference and high volume, high speed data transfer etc.
Messaging Services which is mainly Store and forward service . It includes voice & video mail, multimedia mail as well as traditional electronic mail.
Retrieval service providing access to public info. Stores, and
the information can be retrieved upon user request or demand.
No/user control of presentation. Eg.TV broadcast, where user can choose either to view or not in no user ctrl presentation whereas in user ctrl presentation user can partially ctrl the broadcast.
Apps: although it differs from ISDN standard, but plays an important role in the future success of ISDN. Specially B-ISDN which is been generally aimed for Multimedia and communication purpose. For ex. Videophone, Low-res voice and High-res sound etc.
ATM: Due to improvement of ATM tech. data transfer rate has increased to 155 Mbps. And still research is going on to increase Coverage and Data transfer rate.
Replacing twisted copper wire with Fiber Optic Cables.
Throughout the presentation we have discussed about ISDN where it has been Divided into 3 different sections BRI, PRI and B-ISDN. Whereas amongst these three B-ISDN is widely used and still being researched for further improvements and updates.
http://en.wikipedia.org/wiki/Basic_Rate_Interface http://en.wikipedia.org/wiki/Primary_Rate_Interface#PRI_and_B
RI http://www.javvin.com/protocolATM.html http://en.wikipedia.org/wiki/Broadband_Integrated_Services_Di
gital_Network http://www.javvin.com/protocolBISDN.html http://www.doc.ic.ac.uk/~nd/surprise_95/journal/vol2/vm4/articl
e2.html http://hea-www.harvard.edu/~fine/ISDN/future.html Verizon: No Longer Taking Orders for ISDN Service in Northeast
Starting May 18". Talkers. March 28, 2013. Retrieved April 6, 2013.
"What is ISDN?". Southwestern Bell. Retrieved April 6, 2013
