Targus ACW20US Manuale utente

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BRUSSELS HANNOVER BARCELONA TOKYO MILAN AMSTERDAM SINGAPORE LONDON PARIS NEW YORK LOS ANGELES TORONTO HONG KONG SYDNEY

Targus WiFi

Scanner

USER’S GUIDE

Making Your Mobile Life Easier.®

Visit our Web site at: www.targus.com

Features and specifications are subject to change without notice.

ACW20US / 400-0204-001A

TARGUS WIFI SCANNER

Introduction

Thank you for purchasing the Targus WiFi Scanner. The

Targus scanner quickly identifies all access points in the

area. It detects 2.4Ghz WiFi signals (802.11b/g) from

access points within 200 feet (61 m) outdoors and 60 feet

(18 m) indoors. It also features an LCD display of SSID,

Signal Strength, Secure/Open, and Channel Number.

Installing the Batteries

1 Slide the battery door toward the top of the housing.

2 Insert two AAA batteries as indicated.

The Targus scanner features a battery strength indicator

that will display when battery power is low and an automatic

shut-off to maximize battery life.

Operating the WiFi Scanner

1 Push the activation button.

2 The WiFi® Scanner will begin scanning channels.

Activation

button

LCD

Battery

compartment

Keychain loop

When a WiFi access point is located, the scanner's LCD

will display:

› the access point's SSID (service set identifier);

› a set of one to four bars indicating signal strength (one

bar equals weak signal and four bars equals strong

signal) ;

› the words "Secure" or "Open" to indicate the network's

encryption status;

› the channel that the access point is broadcasting will

be displayed (number 1 to 13).

3 After the device has located an access point, you may

push the activation button again to scan for additional

access points. If no access point is present, the scanner

will display "No AP Found".

4 The device will display any located access points for

approximately 30 seconds. After such time, the device

will power down automatically. The device does not

continuously scan. You must press the Activate button

each time you want updated information on local access

points.

5 If the device displays "Low Battery", the batteries should

be replaced.

Using the WiFi Scanner

The following are some of the many uses

for the WiFi Scanner:

Finding usable networks - Travelers, students and other

roaming WiFi users can use the scanner to find available

networks (please check your local law before using an open

network without prior permission). The scanner only detects

802.11b and 802.11g access points. It will not detect

802.11a signals.

Site survey - Use the scanner to determine where your

home or office coverage extends, and where the optimal

locations for use of the network are.

Security - The scanner can be used to determine whether

your home or office network is "leaky". The device can

detect whether your access point's signal extends beyond

your walls, and whether it is secured. The scanner can also

help you detect "rogue" access points.

About WiFi Networks

The scanner provides the following information about a

WiFi network: SSID, signal strength, encryption status and

channel.

SSID

The SSID is the name given a network by a network

operator to distinguish the network from other networks. An

SSID may be distinctive enough that it will allow you to

distinguish a public network from a network that is intended

for public use. Public WiFi service providers often configure

their networks to display an SSID that is similar to the

service provider's name.

For example, if the scanner shows a network with a

"wayport_access" SSID or a "t-mobile" SSID, you are likely

to be able to access a commercial WiFi hotspot, as these

SSIDs are commonly used by Wayport and T-Mobile, two

commercial hotspot providers.

By contrast, a "default" SSID or an SSID that contains the

name of an access point manufacturer may indicate that a

network is operated by a home user that has not specifically

configured the SSID of his or her network.

With most access points, it is possible to disable the

broadcast of an SSID. If the scanner detects an access

point on which the SSID broadcast has been disabled, it

will typically display "Cloaked" instead of an SSID.

Signal Strength

The scanner displays an image of one to four vertical bars,

indicating the relative strength of the signals detected by

the scanner. By scanning repeatedly, you may be able to

determine whether you are moving closer to or farther from

a network access point by watching the increase or

decrease in the relative signal strength.

Encryption

Any WiFi certified access point is capable of encrypting

WiFi signals using the Wired Equivalent Privacy (WEP)

standard or Wi-Fi Protected Access (WPA™). WEP-

encrypted network requires that a user input an encryption

key before the network can be accessed. The scanner

displays "Secure" when a given network is encrypted, and

"Open" when the network is not encrypted.

Network operators use WEP to prohibit roaming WiFi users

from accessing a network. A network operator who has

enabled WEP is sending a clear signal to a roaming user

that the network is not intended to be accessed by

outsiders.

You can use the scanner to verify that your home or office

network is properly secured, or to detect "rogue" access

points. IT managers may wish to scan their office premises

to detect unexpected access points, and to find any access

points that are unintentionally unencrypted.

Channel

The scanner scans 13 channels. While only 11 channels

are used in the U.S., 13 channels are used for WiFi in

Europe.

Because WiFi channels overlap on adjacent channels,

channel information can be useful in detecting potential

reasons for interference.

You may wish to use the scanner when configuring your

home or office network to determine what channels are

least likely to experience interference.

Troubleshooting

I am seeing strange symbols in the SSID readings/

the LCD display is faint/ the WiFi Scanner is incon-

sistent in detecting networks.

• These are all possible symptoms of a low battery.

I am receiving inconsistent signal strength indications.

• The scanner determines signal strength based on a very

small sample. Radio frequency signals are, by their

nature, variable in strength and coverage. By scanning a

few times, you may be able to get a better sense of the

strength of signal available to you.

The WiFi Scanner seems to be "sticking" on a single

SSID.

• In some WiFi implementations that use multiple access

points on the same network, with the same SSID, the

scanner may bounce from one access point to another

with the same SSID. This appears to the user as though

the scanner is "stuck" on a single network. This problem

will correct itself as you move around within a coverage

area.

My home network is on, but the WiFi Scanner

doesn't detect it.

• First, check your battery. The scanner sometimes fails to

detect networks if its batteries are low. In addition,

access points are occasionally configured in a way that

the scanner cannot detect. If the scanner does not detect

your home network you may want to try any of the

following: (i) check your SSID for non-alphanumeric

characters; (ii) temporarily lower your default data rate; or

(iii) enable the broadcast of your SSID. The scanner

detects most, but not all access points that have been

configured to disable the broadcasting of their SSIDs.

Technical Support

For technical questions, please visit:

http://www.targus.com/support.asp

Product Registration

Targus recommends that you register your Targus accessory shortly

after purchasing it. To register your Targus accessory, go to:

http://www.targus.com/registration.asp

You will need to provide your full name, email address, phone

number, and company information (if applicable).

Warranty

Targus warrants this product to be free from defects in materials and

workmanship for one year. If your Targus accessory is found to be

defective within that time, we will promptly repair or replace it. This

warranty does not cover accidental damage, wear and tear, or

consequential or incidental loss. Under no conditions is Targus liable

for loss of, or damage to a computer; nor loss of, or damage to,

programs, records, or data; nor any consequential or incidental

damages, even if Targus has been informed of their possibility. This

warranty does not affect your statutory rights.

Regulatory Compliance

This device complies with Part 15 of the FCC Rules. Operation is

subject to the following two conditions: (1) This device may not

cause harmful interference, and (2) This device must accept any

interference received, including interference that may cause

undesired operation.

FCC Statement

Tested to Comply

This equipment has been tested and found to comply with the limits

of a Class B digital device, pursuant to Part 15 of the FCC Rules.

These limits are designed to provide reasonable protection against

harmful interference in a residential installation. This equipment

generates, uses, and can radiate radio frequency energy and if not

installed and used in accordance with the instructions, may cause

harmful interference to radio communications. However, there is no

guarantee that interference will not occur in a particular installation.

If this equipment does cause harmful interference to radio or

television reception, which can be determined by turning the

equipment off and on, the user is encouraged to try to correct the

interference by one or more of the following measures:

• Reorient or relocate the receiving antenna;

• Increase the separation between the equipment and receiver;

• Move the computer away from the receiver;

• Connect the equipment into an outlet on a circuit different from

that to which the receiver is connected.

All trademarks and registered trademarks are the property of their

respective owners. Features and specifications subject to change without

92806 USA.

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