What is ISDN?

The Integrated Services Digital Network (ISDN), a new telecommunications technology, was developed from the existing telephone network by combining all telecommunications services from today various networks and other new modem telecommunications services in ISDN system into this new network.

It enable transmission of voice, data, text, pictures and video in larger quantities and quicker than the original network. Besides, the ISDN transmission is reliability, ISDN is a digital network and information is sent by digital signal in the whole system, so that there is no transforming from digital signal to analog signal and vice versa.

Then there is so little noise and communication signal will have no distortion. Data will have more accuracy than transmitting in analog signal like present network.
The advantage of using Internet with ISDN is higher speed of transmitting since ISDN network can transmit communication signal in the speed at 64Kbps per channel.

Principle services of ISDN

1.     Basic Access Interface (BAI)

Using only one wire pair, subscribers can choose to install 8 terminal equipment in an ISDN wire pair that has 3 channels. They compose of 2 channels B for voice, data picture and video (digital) signal transmission so subscribers can use simultaneously 2 communication equipment without interference to each other, for example subscribers can use telephone and facsimile at the same time. Each of the 2 channels B have a speed at 64Kbps, and 1 channel D has speed at 16Kbps for transmitting signal to request services and call control channels B.

2. Primary Rate Interface (PRI)

This type of linkage connects the user's ISDN PABX by using optical fiber cable. The channel structure contains 30 channels B speed at 64Kbps each without interference to each other, being able to use simultaneously installed behind ISDN PABX 30 communication equipment and 1 channel D speed at 64Kbps.
Therefore, it's still provides other support services such as presentation, providing more than 1 number for each telephone, expanding telephone numbers services, moving equipment during communication without releasing the signal (Terminal Portability) and so on etc.

There are many "other services" available. Some important things to bear in mind are:

1. Are you paying for more than you need?
If, for example, you use "broadband" unlimited connections say at Bt3,500 a month for "all ways on" do you really need this?

2. Is your line only for your exclusive use, as in ISDN and ADSL or will your broadband provider keep adding more people to their line to cover their very high line costs? The more that are added, the slower your connection becomes.

3. If you use 100 hours a month, then why not pay for 100 hours a month? It is cheaper in the long run.

4. Always connected with broadband means exactly that. So if you do not understand firewalls and PC protection and you leave your pc on all the time then a "hacker" could attempt and maybe succeed in gaining access to your private information. With ADSL and ISDN this cannot happen as you have to physically turn on your modem (ADSL) or dial up to your leased line (ISDN)

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