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DSL-504T DSL Router User
s Guide
vi
Installation Requirements
In order to establish a connection to the Internet it will be necessary to provide information to the
Router that will be stored in its memory. For some users, only their account information (Username
and Password) is required. For others, various parameters that control and define the Internet
connection will be required. You can print out the two pages below and use the tables to list this
information. This way you have a hard copy of all the information needed to setup the Router. If it
is necessary to reconfigure the device, all the necessary information can be easily accessed. Be
sure to keep this information safe and private.
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.
Operating Systems
The DSL-504T uses 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, including Windows 98 SE, Windows ME, Windows 2000, and Windows XP.
Web Browser
Any common web browser can be used to configure the Router using the web configuration
management software. The program is designed to work best with more recently released browsers
such as Opera, Microsoft Internet Explorer
®
version 5.0, Netscape Navigator
®
version 4.7, 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 Router must be able to connect to it through the Ethernet port on the
Router. This connection is an Ethernet connection and therefore requires that your computer be
equipped with an Ethernet port as well. Most notebook computers are now sold with an Ethernet
port already installed. Likewise, most fully assembled desktop computers come with an Ethernet
NIC adapter as standard equipment. If your computer does not have an Ethernet port, you must
install an Ethernet NIC adapter before you can use the Router. If you must install an adapter,
follow the installation instructions that come with the Ethernet NIC adapter.
Additional Software
It may be necessary to install software on your computer that enables the computer to access the
Internet. Additional software must be installed if you are using the device a simple bridge. For a
bridged connection, the information needed to make and maintain the Internet connection is stored
on another computer or gateway device, not in the Router itself.
If your ADSL service is delivered through a PPPoE, PPPoA or Static IP connection, the information
needed to establish and maintain the Internet connection can be stored in the Router. In this case,
it is not necessary to install software on your computer. It may however be necessary to change
some settings in the device, including account information used to identify and verify the
connection.
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DSL-504T DSL Router User
s Guide
vii
Information you will need from your ADSL service provider:
Username
This is the Username used to log on to your ADSL
service provider
s network. It is commonly in the
form
-
. Your ADSL service provider
uses this to identify your account.
Record info here
Password
This is the Password used, in conjunction with the
Username above, to log on to your ADSL service
provider
s network. This is used to verify the identity
of your account.
Connection and
Encapsulation Type
This is the method your ADSL service provider uses
to transport data between the Internet and your
computer. Most users will use the default
PPPoE/PPPoA, connection type. The Setup Wizard can
be used to configure a PPPoE/PPPoA connection type.
You may need to specify one of the following
connection types (PPPoE LLC, PPPoA LLC or PPPoA
VC-MUX). The other available connection and
encapsulation combinations must be configured using
the web manager. These include Bridge Mode (1483
Bridged IP LLC or 1483 Bridged IP VC-MUX), and
Static IP (Bridged IP LLC, 1483 Bridged IP VC-MUX,
1483 Routed IP LLC, 1483 Routed IP VC-MUX or
IPoA).
VPI
Most users will not be required to change this setting.
The Virtual Path Identifier (VPI) is used in conjunction
with the Virtual Channel Identifier (VCI) to identify
the data path between your ADSL service provider
s
network and your computer. If you are setting up the
Router for multiple virtual connections, you will need
to configure the VPI and VCI as instructed by your
ADSL service provider for the additional connections.
This setting can be changed in the WAN menu of the
web management interface.
VCI
Most users will not be required to change this setting.
The Virtual Channel Identifier (VCI) used in
conjunction with the VPI to identify the data path
between your ADSL service provider
s network and
your computer. If you are setting up the Router for
multiple virtual connections, you will need to
configure the VPI and VCI as instructed by your ADSL
service provider for the additional connections. This
setting can be changed in the WAN menu of the web
management interface.
Note
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DSL-504T DSL Router User
s Guide
1
1
Introduction
This section provides a brief description of the Router, its associated technologies and a list of
Router features.
Router Description and Operation
The DSL-504T ADSL Router is designed to provide a simple and cost-effective ADSL Internet
connection for individual computers through the Ethernet ports, or use it to bridge your Ethernet
LAN to the Internet. The DSL-504T combines the benefits of high-speed ADSL technology and LAN
IP management in one compact and convenient package. ADSL technology enables many
interactive multi-media applications such as video conferencing and collaborative computing.
The Router is easy to install and use. The DSL-504T connects to computers or an Ethernet LAN via
a standard Ethernet interface. The ADSL connection is made using ordinary twisted-pair telephone
line with standard connectors. Multiple PCs can be networked and connected to the Internet using a
single Wide Area Network (WAN) interface and single global IP address.
The Router supports transparent bridging and can be used for IP packet routing over the Internet.
Cost saving features of the Router such as NAT (Network Address Translator) and DHCP (Dynamic
Host Configuration Protocol) improve administration efficiency and improve security for your
private network. The advanced security enhancements, packet filtering and port redirection, can
help protect your network from potentially devastating intrusions by malicious agents from outside
your network.
What is ADSL?
Asymmetric Digital Subscriber Line (ADSL) is an access technology that utilizes ordinary copper
telephone lines to enable broadband high-speed digital data transmission and interactive
multimedia applications for business and residential customers.
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 make it possible to enjoy benefits such as high-speed Internet access
without experiencing any loss of quality or disruption of voice/fax telephone capabilities.
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, depending on local telephone line conditions. 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.
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DSL-504T DSL Router User
s Guide
2
Router Features
The DSL-504T ADSL Router utilizes the latest ADSL enhancements to provide a reliable Internet
portal suitable for most small to medium sized offices. DSL-504T advantages include:
PPP (Point-to-Point Protocol) Security
The DSL-504T ADSL Router supports PAP
(Password Authentication Protocol) and CHAP (Challenge Handshake Authentication Protocol)
for PPP connections.
DHCP Support
Dynamic Host Configuration Protocol automatically and dynamically assigns
al LAN IP settings to each host on your network. This eliminates the need to reconfigure every
host whenever changes in network topology occur.
Network Address Translation (NAT)
For small office environments, the DSL-504T allows
multiple users on the LAN to access the Internet concurrently through a single Internet account.
This provides Internet access to everyone in the office for the price of a single user.
NAT improves network security in effect by hiding the private network behind one global and
visible IP address. NAT address mapping can also be used to link two IP domains via a LAN-to-
LAN connection.
TCP/IP (Transfer Control Protocol/Internet Protocol)
The DSL-504T supports TCP/IP
protocol, the language used for the Internet. It is compatible with access servers manufactured
by major vendors.
RIP
The DSL-504T supports RIP (RIP V1 compatible) to exchange routing information with
other routers.
Static Routing
This allows you to select a data path to a particular network destination that
will remain in the routing table and never
age out
. If you wish to define a specific route that
will always be used for data traffic from your LAN to a specific destination within your LAN (for
example to another router or a server) or outside your network (to a ISP defined default
gateway for instance).
Default Routing
This allows you to choose a default path for incoming data packets for
which the destination address is unknown. This is particularly useful when if the Router
functions as the sole connection to the Internet.
ATM (Asynchronous Transfer Mode)
The DSL-504T supports Bridged Ethernet over ATM
(RFC1483), IP over ATM (RFC1577) and PPP over ATM
(RFC 2364)
.
Precise ATM Traffic Shaping
Traffic shaping is a method of controlling the flow rate of ATM
data cells. This function helps to establish the Quality of Service for ATM data transfer.
G.hs (Auto-handshake)
This allows the Router to automatically choose either the G.lite or
G.dmt ADSL connection standards.
High Performance
Very high rates of data transfer are possible with the Router. Up to eight
Mbps downstream bit rate using the G.dmt.
Full Network Management
The DSL-504T incorporates SNMP (Simple Network
Management Protocol) support for web-based management and text-based network
management via an RS-232 or Telnet connection.
Telnet Connection
The Telnet enables a network manager to access the Router
s
management software remotely.
Easy Installation
The DSL-504T uses a web-based graphical user interface program for
convenient management access and easy set up. Any common web browser software can be
used to manage the Router.

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