BSNL ISDN, Basic Rate Access Service, Primary Rate Access Service, Tariff, FAQ

 ISDN - Integrated Service Digital Network
An ISDN user can set up two simultaneous independent Telecom calls on the
existing pair of telephone wires. The two simultaneous calls can be of any
type - speech, data, image or video.
Using an ISDN line the data transfer rate with another ISDN line on dial-up basis
is a fantastic 64 Kbps ! It can go upto 128 Kbps !!
Features of ISDN
Universality : Various facilities in the same interface.
Portability : Shifting of terminal possible during call.
Integration of Services : Speech, facsimile or data can be transmitted through the same channels.
Flexibility of Services& : Disconnecting / connecting the services needed by the subscriber is possible.
Broad band : ISDN can provide broadband connections (more than 64 kbps) also.
The interface between the ISDN subscriber and the network is called User Network Interface. There are two types of User Network Interface :-
1. ISDN - Basic Rate Access Service
2. ISDN - Primary Rate Access Service

ISDN - Basic Rate Access Service
With an ISDN line you can do video-conferencing with another ISDN subscriber on dial up basis.
Two types of Video conferencing are being offered.
  • Ordinary video conferencing (128 Kb/s), operating on one ISDN line.
  • High quality video (384 Kb/s), requiring simultaneous use of three ISDN lines.
What Equipment you need for ISDN ?

a) an ISDN Phone Set,
b) a PC through an ISDN data card or digital
c) Video Conferencing equipment - for
conference over long distances.
d) Digital-G4 FAX - a much faster and better
quality of FAX sending with another G4 FAX.
How to connect an ordinary phone or FAX ?
No problem. Connect to the NT1 through a
Terminal Adapter ( TA ).
ISDN Feature Phone :- It looks like a feature phone with hands-free operation, memory dialling, LCD
display etc. It can display the dialed No. calling party No. for an i/c call, & short
text message. It can store the calling No. in case of �no reply� for later retrieval
(log-in facility). It is also used for programming of MSN, CF etc. ( discussed
later ). While signaling a �Call Waiting� it can display the waiting caller�s Phone No. also.
It enables use of many ISDN facilities using existing Phones, Fax machines,
Modem etc. The TA may have two types of connectors.
Analog connector :- Connect ordinary phones, Modems, FAX, Answering machine, Cordless
Phones etc.
Data Port :- Any serial port of the PC can be connected to this port. Data transfer using standard
software packages like TELIX, XTALK or PROCOMM is possible at 64 Kbps or faster
speeds upto 128 kbps. Additional Modem is not required.
ISDN PC card :- This card is fitted in a standard PC expansion slot. Data Transfer speed
supported is 64 kbps & above. It consists of a PC with a VDU, a Video Camera
and associated controller cards plus software. The system is connected to the
Exch. via 1 to 3 ISDN lines (depending on the Model). The equipment establishes
connection to a similar equipment on the other side by dialling. Video images of
the conference participants & / or Video tape movies as well as conversations
can be sent / received. Data transfer can also be done simultaneously. Both the
transmitted & the received pictures can be viewed on two windows on the PC
On one ISDN line after the NT1 you can connect a maximum of 8 Telecom gadgets using RJ45
plug and sockets. The internal wiring in the subscriber premises is terminated on RJ45 sockets,
all in parallel on a 8-wire S-bus. However, only two gadgets at a time may be used on one ISDN
connection. Video conferencing will, of course, be only one at a time.
�PHONE PLUS� facilities on an ISDN Line :
ISDN also supports a whole new set of additional facilities boosting the versatility of usage.
Calling Line Id. Display (CLI-P) When an SDN user receives a call, the calling subscriber
number will be displayed on the LCD display panel of his
ISDN phone during ringing .
Advice of Charge (AOC) The amount charged for a call, in terms of call units, will be
displayed on the calling subscriber�s ISDN phone.
In case of long distance calls, it is possible to display the
metered call increments while the call is in progress.
Multiple Subscriber No. (MSN) For calling a specific device / terminal connected to the NT1,
separate Phone No. can be allotted to each Customer
Premises Equipment. This is useful when the call is received
from normal (analog) subscriber. In case a call is received
from another ISDN subscriber, the terminal selection will
be automatic.
Call Waiting (CW) If a 3rd call arrive while an ISDN phone user is busy talking, a
Call Waiting tone will be heard and the Feature phone LCD
display will show the Waiting caller�s phone No.
Terminal Portability (TP) This facility is available for both the calling as well as the
called ISDN subscriber. It allows transfer of the call during
conversation, from one terminal to another on the S-bus or
even remove the terminal from its RJ45 socket and connect
it to another socket at a different location on the same S-bus
Closed User Group (CUG) Companies with officers in different Cities can have their ISDN
numbers in a closed user group. This group can enjoy certain
calling privileges like selective call barring & additional level
of security. This will ensure security of data transfer & prevent
unauthorized access.
User to User Signaling (UUS) The ISDN user can send a short message (up to 40 characters)
from the ISDN terminal at the time of call setup. This will be
displayed at the called terminal even before answering. 

Primary Rate ISDN Line
A primary rate (PRI) ISDN line is designed to provide ISDN facilities to corporate EPABX extensions or access to a Server computer / corporate Intranet.
A PRI ISDN line supports 30 B channels and depending on bandwidth requirements, for any one communication any combination of B channels - up to 30, can be used.
The bit transmission rate on a PRI ISDN link is 2 Mb/s with time slot structure same as that of a normal TDM / PCM link used for inter-exchange junctions. So, the link is supported either on copper cable with Digiplexers at both ends, or on all standard media used for inter-exchange links e.g. optical fibre, microwave, satellite etc.
The PRI ISDN line is terminated onto NT2 at the Customer�s premises.
( NT2 is to be provided by the customer )

Tariff of ISDN
Installation and Testing Charges (one time charge in Rs.)
Wiring Charges up to NT for Primary Rate Access (PRA)4000
Wiring Charges up to NT1 for Basic Rate Access (BRA)*300
Subscriber Interface Bus 500
Cost of ISDN Terminals
Ordinary ISDN Phone 275
ISDN PC Card 400
ISDN Feature Phone 550
Terminal Adapter 475
ISDN PBX per port 800
G4 Fax Terminal 6000

* Rs. 250 may be waived off in case of internal wiring provided by the customer.
** Installation and testing charges for ISDN terminals will not be levied in case
such equipment is purchased and installed by the subscriber on its own.

Fixed Monthly Charges for Access on BRI ISDN line revised on 11.06.2008
Plans (Amount in Rs.)
Registration chargesNilNilNilNil
Initial deposit**3000300030003000
Plan charges--59011402640
Fixed Monthly Charges360360360360
Free Calls070012503000
Unit Call Charges beyond free calls

** Additional Security Deposit Rs. 3000/- for NTI, if provided by BSNL

Fixed Monthly Charges for Access on PRI ISDN line w.e.f. 11.06.2008:
Particulars Plans (Amount in Rs.)
GeneralEconomySpecialSuperMegaSuper Mega
Registration chargesNil NilNilNilNilNil
Initial deposit (ARD)100001000015000150001500015000
Plan ChargesNil8250182504325088250298250
Fixed Monthly Charges175017501750175017501750
Free Calls (MCU)Nil7500180004400090000325000
Unit Call Charges beyond free calls1.101.10 1.00 0.850.800.70
Note :
The customers under existing one India ISDN PRI plan may be migrated to the Economy plan or to any
other plan after taking a written request from them.

Annual payment facility for ISDN PRl/BRl customer's on optional basis by charging 10 months
fixed monthly charges, in advance, instead of 12 months FMC of ISDN BRI/ PRI connecticos subject. to
condition that no other special discount or reduction in unit rate will be applicable under Annual payment
facility. This will be applicable on all Genera1 and Alternative tariff plans of ISDN PRI/BRI .
All other terms and conditions will remain same.
Short duration access charges for PRA ISDN line
Minimum period of hire15 days
Registration chargesNil
Initial deposit Rs.15000
Fixed Monthly ChargesRs.6000/- up to 3 Kms. and Rs. 3000/- for each additional Km. or part thereof
Monthly Free CallsNil
Unit Call Charges beyond free callsRs.1.20
256 Kbps Internet access for BRA ISDN

BandwidthFixed Monthly ChargesMonthly Plan ChargeMonthly Total Charges
256 KbpsRs. 800Rs. 5200Rs. 6000
• Service Tax : 12% & Educational Cess ; 2% of service tax extra.
• No call harges and Internet access charges for accessing Sancharnet
Other calls (i.e. Voice call and calls to other Internet nodes) will be charged on usual call tariff, apart from Rs. 6,000 for 256 Kbps.
• Other charges like registration, security deposit, installation and testing
charges, call charges are as usual.

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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