DSL-G604T 54Mbps Wireless ADSL2/2+ Modem/Router Manual

Front Panel

Place the Router in a location that permits an easy view of the LED indicators on the front panel. The

LED indicators on the front panel include the

Power

,

Status

,

ADSL Link/Act,

WLAN Link/Act,

and

Ethernet Link/Act

indicators.

Power

Steady green light indicates

the unit is powered on. When

the device is powered off this

remains dark.

Status

Lights steady green during

power on self-test (POST).

Once the connection status

has been settled, the light will

blink green. If the indicator

lights steady green after the

POST, the system has failed

and the device should be

rebooted.

ADSL (Link/Act)

Steady green light indicates a

valid ADSL connection. This

will light after the ADSL

negotiation process has been

settled. A blinking green light

indicates activity on the WAN

(ADSL) interface.

WLAN (Link/Act)

Steady green light indicates a

wireless connection. A

blinking green light indicates

activity on the WLAN

interface.

Ethernet (Link/Act)

1 - 4

A solid green light indicates a

valid link on startup. This light

will blink when there is

activity currently passing

through the Ethernet ports.

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DSL-G604T 54Mbps Wireless ADSL2/2+ Modem/Router Manual

Rear Panel

Connect the AC power adapter cord and network cables on the rear panel. The power switch and reset

button are also located on the back of the device. Connect the antennas to the antenna posts.

All cable connections to the Router are made at the rear panel. The power switch and factory reset

button is located here as well.

Ethernet ports

Use the Ethernet

ports to connect

the Router to

your Ethernet

LAN or Ethernet

devices

Antenna

For wireless

operation, mount

the antenna on

the threaded

antenna post

Reset button

To manually

reset, depress

button with the

power on for a

10 seconds

ADSL Port

Use the ADSL

cable to

connect to the

your telephone

line (RJ-11

port)

Power Insert

Use the adapter

shipped with the

Router to connect

to power source

Wireless LAN Basics

Some basic understanding of 802.11g wireless technology and terminology is useful when you are

setting up the Router or any wireless access point. If you are not familiar with wireless networks

please take a few minutes to learn the basics.

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DSL-G604T 54Mbps Wireless ADSL2/2+ Modem/Router Manual

Radio Transmission

Wireless LAN or WLAN devices use electromagnetic waves within a broad, unlicensed range of the

radio spectrum to transmit and receive radio signals. When a wireless access point is present, it

becomes a base station for the WLAN nodes in its broadcast range. WLAN nodes transmit digital data

using FM (frequency modulation) radio signals. WLAN devices generate a carrier wave and modulate

this signal using various techniques. Digital data is superimposed onto the carrier signal. This radio

signal carries data to WLAN devices within range of the transmitting device. The antennae of WLAN

devices listen for and receive the signal. The signal is demodulated and the transmitted data extracted.

The transmission method used by the access point is called Direct Sequence Spread Spectrum (DSSS)

and operates in a range of the radio spectrum between 2.4GHz and 2.5GHz for transmission. See the

technical specifications for more details on wireless operation.

Range

Range should not be a problem in most homes or small offices. If you experience low or no signal

strength in some areas, consider positioning the Router in a location between the WLAN devices that

maintains a roughly equal straight-line distance to all devices that need to access the Router through

the wireless interface. Adding more 802.11g access points to rooms where the signal is weak can

improve signal strength. Read the section about placement of the Router titled Location in the next

chapter, Hardware Installation, for more information.

SSID

Wireless networks use an SSID (Service Set Identifier) to allow wireless devices to roam within the

range of the network. Wireless devices that wish to communicate with each other must use the same

SSID.

Several access points can be set up using the same SSID so that wireless stations can move

from one location to another without losing connection to the wireless network.

The DSL-G604T operates in

Infrastructure

mode. It controls network access on the wireless interface

in its broadcast area. It will allow access to the wireless network to devices using the correct SSID

after a negotiation process takes place. By default the DSL-G604T broadcasts its SSID so that any

wireless station in range can learn the SSID and ask permission to associate with it. Many wireless

adapters are able to survey or scan the wireless environment for access points. An access point in

Infrastructure mode allows wireless devices to survey that network and select an access point with

which to associate. You may disable SSID broadcasting in the web manager’s wireless menu.

Wireless Security

Various security options are available on the DSL-G604T including open or WEP, WPA, and WPA-

PSK. Authentication may use an open system or a shared key. For details on these methods and how to

use them, please read the wireless LAN configuration information in chapters 3 (Basic Router

Configuration) and 4 (Advanced Router Configuration) below.

About 802.11g Wireless

Today's 11-megabits-per-second 802.11b wireless networks are fine for broadband Internet access

(which typically tops out at about 1 Mbps) but rather slow for large internal file transfers or streaming

video. However, 54-Mbps, corporate-oriented 802.11a is expensive--and because its radio uses the 5-

GHz band and 802.11b uses the 2.4-GHz band, upgrading to an 802.11a network means either

scrapping 802.11b gear or buying even-pricier hardware that can support both standards.

But 802.11g promises the same speed as 802.11a and the ability to coexist with 802.11b equipment on

one network, since it too uses the 2.4-GHz band.

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DSL-G604T 54Mbps Wireless ADSL2/2+ Modem/Router Manual

802.11g is an extension to 802.11b, the basis of many wireless LANs in existence today. 802.11g will

broaden 802.11b's data rates to 54 Mbps within the 2.4 GHz band using OFDM (orthogonal frequency

division multiplexing) technology. Because of backward compatibility, an 802.11b radio card will

interface directly with an 802.11g access point (and vice versa) at 11 Mbps or lower depending on

range. You should be able to upgrade the newer 802.11b access points to be 802.11g compliant via

relatively easy firmware upgrades.

Similar to 802.11b, 802.11g operates in the 2.4GHz band, and the transmitted signal uses

approximately 30MHz, which is one third of the band. This limits the number of non-overlapping

802.11g access points to three, which is the same as 802.11b.

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DSL-G604T 54Mbps Wireless ADSL2/2+ Modem/Router Manual

2

Hardware Installation

The DSL-G604T functions on two separate networks, as an Ethernet LAN and as an ADSL WAN.

When deciding where to put the Router, the user must take into account the fact that it is connected to

these two networks with three types of media. Ethernet cables connect the Router to computers and

network devices, Wireless cards connect the computers and network devices to the Router, and the

ADSL line connects it to a wall socket. In addition, the device must be near an AC outlet for power.

How to accommodate these wired connections is often not a complicated matter, however, the added

dimension of wireless communication does complicate the decision of Router placement.

Location

The Router can be placed on a shelf or desktop and ideally you should be able to see the LED

indicators on the front if you need to view them for troubleshooting.

Network Connection

Complete the connection to the network through the ADSL port and the Ethernet port on the back of

the Router.

Connect ADSL Line

Use the ADSL cable included with the Router to connect it to a telephone wall socket. Plug one end of

the cable into the ADSL port (RJ-11 receptacle) on the rear panel of the Router and insert the other

end into the RJ-11 wall socket. If you are using a low pass filter device, follow the instructions

included with the device or given to you by your service provider. The ADSL connection represents

the WAN interface. It is the physical link to the ISP’s network backbone and ultimately to the Internet.

Connect Router to Ethernet

The Router may be connected to any 10/100BASE-TX Ethernet LAN. Any connection to an Ethernet

concentrating device such as a switch or hub must operate at a speed of 10/100 Mbps only. When

connecting the Router to any Ethernet device that is capable of operating at speeds higher than

10Mbps, be sure that the device has auto-negotiation (NWay) enabled for the connecting port.

Use standard twisted-pair cable with RJ-45 connectors. The RJ-45 port on the Router is a crossed port

(MDI-X). Follow standard Ethernet guidelines when deciding what type of cable to use to make this

connection. When connecting the Router directly to a PC or server use a normal straight-through

cable. You should use a crossed cable when connecting the Router to a normal (MDI-X) port on a

switch or hub. Use a normal straight-through cable when connecting it to an uplink (MDI-II) port on a

hub or switch.

The rules governing Ethernet cable lengths apply to the LAN to Router connection. Be sure that the

cable connecting the LAN to the Router does not exceed 100 metres.

Hub or Switch to Router Connection

Connect the Router to an uplink port (MDI-II) on an Ethernet hub or switch with a straight-through

cable as shown in the diagram below:

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