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Inet offers the following types of connections :
X.25, X.32, X.28 leased, X.28 dialup and Frame Relay
 X.25
Connections
An X.25
customer with the help of a computer/terminal with CCITT X.25
compatible software and hardware can receive and originate several
simultaneous calls. An X.25 link is similar to telephone junctions
extended to PABX. X.25 connection is provided on leased line (2 wire
or 4 wire) from the Inet exchange. The speed of connection can
be 2400, 4800, 9600, 19200 or 64000bps. The modems used will be V.22
bis, V.29, V.32 bis, Data-Over-Voice, V.35 or 64 Kbps line drivers.
X.32
Connections
X.32
access enables X.25 customers to have a backup access to Inet
using PSTN. It provides all the functionalities of X.25 but on dialup
mode. The speed of connection can be 2400, 4800 or 9600 bps. Modems
used will be V.32 bis.
X.28
Leased Connections
An
X.28 lease customer can receive or originate only one call at a time. This
is similar to a normal telephone connection. This customer can use
computer/terminal with appropriate communication software (like
Procomm, Xtalk etc.). The speed of connection can be 1200, 2400, 4800
or 9600 bps. This connection is also provided on leased line from the
Inet exchange to the customer's premises. The modems used will be V22
bis, V32 bis or Data-Over-Voice.
X.28
Dialup Connections
An
X.28 Dialup customer can use any computer/terminal with
appropriate communication software (like Procomm, Xtalk etc.) to
originate or receive calls at 300, 1200, 2400, 4800 or 9600 bps using
a TEC approved, PSTN dialup modem connected to his telephone. In a two
step dialing procedure the customer first dials a local telephone
number of the Inet exchange to get connected to Inet after which he
can establish a call to any other customer of Inet or overseas data
networks. This does not require a leased line from the Inet exchange
to the customer's premises. The modems used will be V.21, V.22 bis or
V.32 bis.
Frame
Relay Service
Frame
Relay service is available only from Group A and Group B cities. Frame
Relay customers can have PVCs (Permanent Virtual Circuits). It can be
used for providing high speed connectivity between LANs in different
cities.
Frame relay is a modified form of packet switching service. It
provides error free data circuits with capability of band-width on
demand.
 Interfaces
The
modem interfaces supported in general are V.24, V.28, V.35 or G.703
(co-directional).
Standards
Inet
supports CCITT standard protocols X.3, X.25, X.28, X.29, X.32 and
X.75.
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