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Introduction
ADSL modems employ ATM (Asynchronous Transfer Mode) framing. ATM is a protocol that
divides packets into small fixed sized cells for rapid transmission over high-speed networks. The
ATM protocol allows various types of traffic (e.g. data, voice, and video) to be securely and
efficiently carried over the same network. ATM is being widely deployed by telecommunications
carriers in their backbone networks. Two type of ATM connections are possible, PVC (Permanent
Virtual Circuit) and SVC (Switched Virtual Circuit).
Several different protocols are used on top of ATM. The protocol required in your configuration
depends on the equipment deployed by your DSL service provider. There are several possibilities:
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Three types of device drivers are provided for the ADSL USB modem, WAN, LAN, and ATM. All
three drivers support ATM protocol. In addition, the ATM driver works with ATM services that are
available in recent Windows operating systems. The proper choice of driver depends on the
combination of Windows
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The device driver choices are summarized in Table 1-1:
1. Microsoft, Windows, Windows 98, Windows 98 SE, Windows 2000, Windows ME and Windows XP are
either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other
countries.
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Issue 02 March 02
Point to Point Protocol (PPP) Over ATM (RFC 2364) - PPP provides session setup, user
authentication (login), and encapsulation for upper layer protocols such as IP (Internet
Protocol). The use of PPP makes the modem appear as a dial-up modem to the operating
system. Dial-Up Networking is used to establish a connection. PPP is supported by either the
WAN (Wide Area Network) driver or the ATM driver.
Bridged/Routed Ethernet/IP over ATM (RFC 1483) – This protocol makes the modem
appear as a local area network (LAN) device to the operating system.
RFC 1577 – this is another local area network like protocol for IP address and ATM address
mapping.
PPP Over Ethernet (RFC 2516) - This protocol makes the modem appear as a LAN device to
the operating system. It allows multiple computer users on an Ethernet to share a common
DSL connection to the Internet.
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operating system and protocol.
WAN – this driver causes the modem to resemble a dial-up modem. Call establishment is
performed through Dial-Up Networking. This driver supports RFC 2364 with PVC
connections. It can be used with Windows 98, Windows 98 SE, Windows 2000, Windows
ME and Windows XP.
LAN (RFC 1483) - this driver makes the modem appear as a LAN or Ethernet device.
Connection establishment is automatic. This driver supports RFC 1483 with PVC
connections. Additionally, PPPoE is supported. It can be used with Windows 98, Windows
98 SE, Windows 2000,Windows ME and Windows XP.
ATM – this driver works in conjunction with ATM services provided by Windows. Both
RFC 1577 and RFC 2364 are supported. The ATM driver uses Dial-Up Networking to create
a PVC or SVC connection to establish a PPP (RFC 2364) connection. This driver can be
used with Windows 98 SE, Windows 2000,Windows ME and Windows XP.
In Commercial Confidence
ADSL USB Modem - User Manual
FTEL
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