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DIFFERENT KINDS OF ISDN TERMINALS
The ISDN telephone
line is terminated on a common box called the Network
Termination (NT) at the subscriber’s premises. The
Network Termination unit along with accessories will be
provided by the MTNL or can be procured by the
subscriber. The terminal equipment has to be procured by
the subscriber himself from the open market. The
terminal equipment should be TEC approved for the
satisfactory working of ISDN.
TYPE OF ISDN TERMINAL
(a) ISDN feature
phone: this is a simplest type of ISDN phone which has
an LCD display and some additional keys.
(b) Terminal adapter
(c) PC add-on ISDN card
(d) Video phone
(e) G4 fax
(f) G4 fax
Benefits of ISDN
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Single
connection can support both voice and data.
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High
quality services being digital right from subs,
premises (end to end).
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Eight
terminals can be connected on a single line.
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High
speed data transfer from PC to PC is possible –
64 Kbps against existing 9.6 Kbps (6 times
faster).
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Two
calls can be established simultaneously on a
single pair of wires.
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The
call set time is very short (1-2 seconds).
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A
number of supplementary services are supported
like in pots.
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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 Operators
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Avoidance
of separate networks for different services.
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Economical
use of the equipment of the digitalized telephone
network, especially the copper pair of the
subscriber line.
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Reduction
in costs due to simplified operation and
maintenance procedures.
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How is ISDN line superior to the phone line ?
- The
signal on the ISDN line–voice or data, is sent
in digital mode.
- The
signal level at subscriber's terminal equipment is
independent of
line length.
- 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 subscribers is
extremely short.
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