Network connections, Virtual connections – Alcatel Carrier Internetworking Solutions 1000 ADSL User Manual
Page 41
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The Alcatel 1000 ADSL high speed modem supports two methods for accessing
remote sites like corporate networks or the World Wide Web via a local ISP. The
two methods are direct networking and dial-up networking.
Direct networking describes a connection that is always active. In other words, no
preliminary steps are required to obtain a connection. Once service is enabled, the
user switches on the PC and the modem, and connects to the remote site (the ISP
or corporate network).
Dial-up networking describes a procedure in which the user requests a
connection by dialing the network. The remote site requires a personal user
account and password before access is allowed.
If your modem has an ATMF-25 port, it supports both direct and dial-up
networking methods. Applications on your PC determine which method you are
using.
If your modem has a 10BASE-T port, the networking method depends on the
Ethernet protocol you are using:
•
Direct networking is supported by an IEEE 802.1D Transparent Databridge in
the modem. You configure your local workstations with the appropriate
parameters or allow your workstations to automatically assume the
parameters from the network via specialized protocols.
•
Dial-up networking relies on the standard Point-to-Point Protocol (PPP) and
local tunneling using the industry Point-to-Point Tunneling Protocol (PPTP).
To determine which networking method you must use, contact your local ISP or
your corporate network administrator.
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Only typical networking solutions are presented here, although
various combinations of available protocols and equipment allow
numerous architectures and networking solutions.
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The ADSL modem uses ATM as a transport protocol. ATM is a connection-
oriented packet-switching technology using fixed-size packets (called cells) to
carry traffic through a public or private network.
ATM connections, typically referred to as virtual connections, are identified by two
values called a Virtual Path Identifier (VPI) and a Virtual Channel Identifier (VCI).
A particular VPI/VCI combination identifies a virtual connection between two