Three options for connecting over a
telephone service:
A D V E R T I S E M E N T
Dial-up connections.
Integrated Services Digital Network(ISDN) - A method of sending
voice and data information on a digital phone line.
Basic ISDN - Two 64Kbps B-channels with one 16Kbps D channel
is provided. The D-channel is used for call control and setup.
Basic ISDN can provide 128Kbps speed capability.
Primary ISDN - 23 B-channels and one D channel is provided.
Leased Lines - This involves the leasing of a permanent
telephone line between two locations.
Remote Communication Protocols
Serial Line Internet Protocol (SLIP) - Allows computers to
connect to the internet with a modem. No error checking or data
compression is supported. Only the TCP/IP protocols are supported.
Point to Point Protocol (PPP) - Provides error checking and data
compression. Also supports multiple network protocols such IPX/SPX
and NetBEUI in addition to TCP/IP. Supports dynamic allocation of IP
addresses.
Remote Access Service
Remote Access Service (RAS) with Windows NT allows users connecting
to the network using a modem to use network resources. RAS may be called
dial up networking (DUN) depending on the version of Windows you are
using. The NT RAS server can handle 256 connections. Windows NT RAS
servers provide the following security features:
User account security
Encryption between the DUN (dial up networking) client and the
server
Callback capability
The client software is called Dial up networking (DUN) in windows NT4 and
Windows95. For NT 3.51 and Windows 3.1 it is called a RAS client. These clients
may be used to connect to the internet through an internet service provider
(ISP).
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