CNet CNUSB-611, WL-200U User Manual

Encryption

On the Encryption screen, show in Fig 4-5, you can set the level of security with which you will

be using the WLAN PC Card.

Under the drop-down box, you can choose to have WEP encryption Disabled, 64-Bit, or 128-

Bit Wired Equivalent Privacy (WEP) is an encryption scheme use to protect wireless data communi-

cation. If you decide to use encryption, you can choose any of the available WEP keys (1 to 4). You

also have option to select the WEP mode (Mandatory/optional). If you select “Mandatory”, then not

only WEP will be used, but also any other station needs to use WEP encryption in order to establish

a communication with your station. This requirement is in line with the IEEE 802.11b standard. If, on

the other hand, you choose “Option”, then your station can communication with every other station

regardless if they use WEP or not. The Disabled setting prevents the sharing of data with other

computers on the WEP network. When Enable encryption for the WEP Key entry, enter the hexa-

decimal number (the letters “A” through “F” and the numbers “0” through “9”) set by the other

wireless WEP settings; these settings must be identical to the WEP encryption on all points in your

wireless network in order to network to your WLAN PC Card. The security keys are four 10 digit key

for the 64-Bit WEP setting and four 26 digit key for the 128-Bit WEP setting.

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Fig 4-5

NOTE: The WEP Key Entry must match the Key on all other devices on the

wireless network or this device will be unable to transmit or receive data.

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For Authentication Type, you may choose between Open System or Shared Key.

Shared Key is when both the sender and recipient share a secret key. Both units this key for

an extended length of time, sometimes indefinitely. Any eavesdropper that discovers the key may

decipher all packets unit the key is changed.

Open System the default setting, is when the sender and the recipient do not share a secret

key. Each party generates its own key-pair and asks the receiver to accept the (usually randomly)

generated key. Once accepted, this key is use for short time only: then a new key is generated and

agrees upon.

Advanced

The Advanced screen (Fig 4-6) allows you to set Fragmentation Threshold, the RTS/CTS

Threshold, and the Preamble Type. The Fragmentation Threshold Value indicates how much of

the network resources is devoted to recovering packet errors. The value should remain at its default

setting of 2,432. If you experience high packet error rates, you can decrease this value but it will

likely decrease overall network performance. Only minor modifications of this value are recom-

mended.

Fig 4-6

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The RTS Threshold Value should remain at its default setting of 2,432. A preamble is a signal

used to synchronize the transmission timing between two or more systems. A series of transmission

pulses is sent before the data to indicate that “someone is about transmit data.” this ensures that

systems receive the information correctly when the data transmission stars.

The Preamble Type should be set to Short (if the network environment is “noisy”) or Long (if

the environment is “clear”) Click Submit to complete the configuration.

About

The About screen (Fig 4-7) shown the release information for the Driver Version, Firmware

Version, Application Version, and MAC Address. User the “Exit” button in order to exit the application.

Fig 4-7

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How to Uninstall the configuration & Monitor Utility

In order to uninstall the Configuration & Monitor Utility from Windows 95/98/ME, you can RUN

Setup utility again then you will see Fig 4-7 then step by step remove all installed components.

It is recommended to stop the WLAN adapter and “Exit” the application prior to staring the

uninstallation procedure.

Fig 4-8

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