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| ISDN |
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| ISDN Has emerged as a powerful tool
worldwide for provisioning of different services like voice,
data and image transmission over the telephone line through
the telephone network. ISDN is being viewed as the logical extension
of the digitalization of telecommunication network and most
developed countries are in different stages of implementing
ISDN. |
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| An ISDN subscriber can establish
two simultaneous independent calls (except when the terminal
equipment is such that it occupies two 'B' channels for one
call itself like in video conferencing etc.) on existing pair
of wires of the telephone line (Basic rate ISDN) where as only
one call is possible at present on the analog line /telephone
connection. The two simultaneous calls in ISDN can be of any
type like speech, data, image etc. The call setup time for a
call between two ISDN subscribers is very short, of the order
of 1 to 2 seconds. ISDN also supports a whole new set of additional
facilities, called Supplementary Services. |
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| Connectivity
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| The ISDN subscriber will have full
connectivity, nationally, to other analog telephone subscribers.
At present ISDN services are available to and from India for
the following countries: |
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- Australia
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Austria
- Belgium
- Canada
- Denmark
- France
- Germany
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Ireland
- Italy
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Israel
- Japan
- Malaysia
- Netherland
- Norway
- Phillipines
- Singapore
- Switzerland
- Thailand
- U.A.E
- United
Kingdom
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U.S.A
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Services
Offered By ISDN
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- Normal
Telephone & Fax (G3)
- Digital
Telephone -with a facility to identify the calling subscriber
number and other facilities.
- G4
Fax
- Data
Transmission at 64 Kbps with ISDN controller card
- Video
Conferencing at 128 Kbps
- Video
Conferencing at 384 Kbps (Possible with 3
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ISDNlines)ATM
(Asynchronous Transfer Mode) or PVC (Permanent Virtual Circuit)
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List
of ISDN stations of BSNL in India |
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Variety
of supplementary Services supported by ISDN. |
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- Calling
Line Identification Presentation(CLIP)
- Calling
Line Identification Restriction(CLIR)
- Multiple
Subscriber Number(MSN)
- Terminal
Portability(TP)
- Call
Hold(CH)
- Call
Waiting(CW)
- User
to User Signaling (UUSI)
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Types
of Accesses |
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- Basic
Rate Access(BRA): 2B+D
2 Channels of 64 Kbps for Speech And Data.
1 Channel of 16 Kbps for Signalling
- Primary
Rate Access (PRA): 30 B+D
30 Channels of 64 Kbps for speech and data.
1 Channel of 64 Kbps for signalling.
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| Site
designed and developed by DDA Infotech |
