Q 1 : Does ISDN connection require any special cable to be laid ?
Ans : No. ISDN line works on the same copper cable up to a distance of 5 Km (approx.) from the
Exchange/RSU. However, ISDN lines cannot be extended over longer distances as of now. Q 2 : Will ISDN connection help in getting INTERNET Access ?
Ans : INTERNET consists of a world-wide network of Information Banks. An ISDN line can be used to
access the INTERNET and in that case the data transfer speed would be 64 kbps or more !
Q 3 : Do I get dial tone by connecting an ordinary phone set on an ISDN line ?
Ans : No. You need an NT1 to be connected first on the ISDN line cable pair. To hear dial tone, with the
NT1 either you will have to connect an ISDN Phone or, a Terminal Adapter and then through the
TA an ordinary phone set.
Q 4 : Will I get any electric shock by touching an ISDN line cable pair ?
Ans : An ISDN line cable pair carries 100 V DC across the leads. So, you may feel a mild shock which
is however not at all fatal to any human being.
Q 5 : Must the NT1 be kept always powered on ?
Ans : Normally Yes. However, if there is no power connected to the NT1, you can still make a voice call
from your ISDN feature phone. But you will not be able to receive calls if the NT1 is powered off.
Q 6 : How an ISDN communication is disconnected ?
Ans : Same way as for an ordinary phone call. However, ISDN communication can be released by
either party in communication.
Q 7 : From an ISDN Line can I contact a non-ISDN line ?
Ans : You can always make a voice call. But using an ISDN data card you will be able to engage in data communication only with another PC equipped with another ISDN data card. Video
conferencing with a non-ISDN line is, of course, out of question.
Q 8 : Will calls made from different gadgets on the ISDN line be billed separately?
Ans : NO. Since you are, after all, using only one ISDN connection, all your meter readings will be
added up and billed together.
Q 9 : How I will know I have been given MSN ?
Ans : You will notice that you are able to receive calls on your ISDN feature phone but can’t make any
outgoing call. Using the ISDN feature phone you will have to program your MSN 1st. Then you will
be able to make outgoing calls.
Q 10 : Shall I get Dynamic Locking Facility on my ISDN line?
Ans : YES, only on ISDN lines from EWSD exchanges / RSUs. However, as such tampering with an
ISDN line is difficult as the full set of Customer Premises Eqpt. Would be required ; plus one
would need to know the MSN programmed by the actual user. So, on the whole, security is high
with ISDN lines.
Q 11 : What are the informations carried by ISDN channels?
Ans : Three types of information are carried in the ISDN
1. User information
2. Control information
3. Network information to subscribers Q 12 : What is bearer service of ISDN ?
Ans : It is the means to convey information (speech, data and video ect.) between
users in real time and without alteration of the content of the message. This
includes speech service with 64kbps, 8khz circuit mode, 64kbps Audio data
analogous to normal PSTN service. Q 13 : What are the supplementary services one can have using ISDN?
Ans : Following are the supplementary services one can have using ISDN.
1. Direct dialling in services
2. Multiple subscribers numbers
3. Calling line Identification
4. Call Forwarding
5. Call Waiting
6. Call Transfer
7. Line Hunting
8. Conferance Call
9. Closed User Group
10. Advice of Charge
11. User to User Signalling Services. Q 14 : What are the different access configuration of ISDN?
Ans :  Point to point configuration.
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