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WHAT IS ISDN ?

Integrated Services Digital Network(ISDN) is a state-of-the-art Public Switched Digital Network for provisioning of different services – voice, data & image transmission over the telephone line through the telephone network. Click to download form for ISDN registration

Benefits of ISDN

1.	Single connection can support both voice and data.
2.	High quality services being digital right from subs, premises (End to End).
3.	Eight terminals can be connected on a single line.
4.	High speed data transfer from PC to PC is possible – 64 Kbps against existing 9.6 Kbps (6 times faster).
5.	Two calls can be established simultaneously on a single pair of wires.
6.	The call set time is very short (1-2 seconds).
7.	A number of supplementary services are supported like in pots.

Calling Line Identification, Call Forwarding, Call Forwarding on busy signal, Call Forwarding on no reply, Call Forwarding unconditional, Advice of Charge, Terminal Portability, Multiple Subscriber Number, Closed User Group.

Benefits of ISDN for Network Operator

• Avoidance of separate networks for different services.
• Economical use of the equipment of the digitalized telephone network, especially the copper pair of the subscriber line.
• Reduction in costs due to simplified operation and maintenance procedures.

Who Can Avail Of This Service ?

With the introduction of state of the art digital technology in the telecom network in India, a firm foundation has been laid for provision of a range of new, powerful and modern services through the integrated services digital network.The services will be of a great significance for both business and residential subscribers. The services will be available through new technology exchanges . The ISDN connection will be provided at the customer premises located within the permissible distance from a new technology exchange or its remote units.

For ISDN Stations Click Here

For ISDN Countries Click Here

How is ISDN line superior to the phone line ?

• The signal on the ISDN line -voice or data ,is sent in digital mode. It therefore enjoys very high immunity from the line noise- an invaluable technological providing very high quality of service.
• The signal level at subscriber 's terminal equipment is independent of line length and line noise which further enhances quality of reception. A significant advantage over plain old telephone lines.
• An ISDN subscriber can establish two simultaneous independent calls which could be voice, data , image or combination of any two whereas only one call is possible on ordinary telephone lines.
• The call set up time between two ISDN subscriber is extremely short.
• ISDN subscribers have full connectivity to all the other analog subscribers both nationally and internationally . ISDN supports a whole range of additional facilities. To mention a few :
  • Calling line identification presentation ( CLIP)
  • Multiple subscriber Number (MSN)
  • Terminal Portability (TP)

ACCESS TO INTERNET
ISDN subscribers can have access to internet with a higher bandwidth of 64/128 kbps giving significantly improved response time and quality of service compared to internet quality of plain and analog telephone lines. When 64 kbps bandwidth is used for internet, you can still make telephone calls on the other channel , which is a big advantage , since internet connections are likely to occupy the line for very long duration.

ISDN will also support a whole new set of additional facilities called supplementary services.