D-Link DSL-302G User Manual - Introduction

DSL-302G ADSL Modem User’s Guide 

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Introduction 

This section provides a brief description of the Modem, its associated technologies and a list of Modem features. 

What is ADSL? 

Asymmetric Digital Subscriber Line (ADSL) is broadband access technology that provides high-speed digital 

data transmission and interactive multimedia applications for business and residential customers over ordinary 

telephone lines. 

ADSL greatly increases the signal carrying capacity of copper telephone lines without interfering with regular 

telephone services. For the ADSL user, this means faster downloads and more reliable connectivity. ADSL 

devices enable high-speed Internet access without any loss of quality or disruption of telephone services. 

ADSL provides a dedicated service over a single telephone line operating at speeds of up to 8 Mbps downstream 

and up to 640 Kbps upstream. A secure point-to-point connection is established between the user and the central 

office of the service provider. 

D-Link ADSL devices incorporate the recommendations of the ADSL Forum regarding framing, data format, 

and upper layer protocols. 

Modem Description and Operation 

The DSL-302G ADSL Modem is designed to provide a simple, cost-effective and secure ADSL Internet 

connection for your small to medium-sized private network. The ADSL connection technology enables many 

interactive multi-media applications such as video conferencing and collaborative computing.  

The Modem is easy to install and use. The DSL-302G connects to an Ethernet LAN via a standard Ethernet 

interface, or a single computer via a USB connection. The ADSL connection is made using ordinary twisted-pair 

telephone line with standard RJ-11 connectors. 

Low Pass Filters 

Since ADSL and telephone services share the same copper wiring to carry their respective signals, a filtering 

mechanism may be necessary to avoid mutual interference. A low pass filter device can be installed for each 

telephone that shares the line with the ADSL line. These filters are easy to install passive devices that connect to 

the ADSL device and/or telephone using standard telephone cable. Ask your service provider for more 

information about the use of low pass filters with your installation. Appendix D provides illustrated examples of 

how to install two common styles of low pass filters.  

Web-based Modem Configuration 

The DSL-302G can be configured by using an HTML-based web interface for setup and management. The web 

configuration manager may be accessed using any operating system capable of running web browser software. 

Computer using the USB port to connect to the Modem must install additional software. The additional software 

will run on Windows operating systems. 

Web Browser 

Any common web browser can be used to configure the Modem using the web configuration management 

software. The program is designed to work best with more recently released browsers such as Microsoft Internet 

Explorer® version 6.0, Netscape Navigator® version 5.2, or later versions. The web browser must have 

JavaScript enabled. JavaScript is enabled by default on many browsers. Make sure JavaScript has not been 

disabled by other software (such as virus protection or web user security packages) that may be running on your 

computer. 

Ethernet Port (NIC Adapter) 

Any computer that uses the Modem must be able to connect to it through either the USB or Ethernet port on the 

Modem. The Ethernet connection therefore requires that your computer be equipped with an Ethernet port as 

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