Wireless LAN PCMCIA Adapter
16
C h a p t e r
5
Troubleshooting
This section provides solutions to problems usually encountered during the installation and
operation of this Wireless LAN CardBus Card. Read the description below to solve your
problems.
9
If you encounter difficulty using / installing the Wireless LAN CardBus Card, this
may be related to various causes:
z
Out-of range situation, which prevents the card from establishing a wireless
connection with the network.
z
Configuration mismatch, which prevents the card from establishing a wireless
connection with the (correct) network.
z
Absence of, or conflict of the Wireless LAN CardBus Card driver.
z
A problem or conflict with the connector, which prevents the Wireless LAN CardBus
Card from powering on.
z
A conflict of the hardware with another device.
9
What does IEEE 802.11 feature support
？
z
CSMA/CA plus Acknowledge Protocol
z
Multi-Channel Roaming
z
Automatic Rate Selection
z
RTS/CTS Feature
z
Fragmentation
z
Power Management
9
Can Wireless products support printer sharing
？
Wireless products perform the same function as LAN products. Therefore, Wireless
products can work with Netware, Windows NT/2000, or other LAN operating systems to
support printer or file sharing.
9
Would the information be intercepted while transmitting on air
？
WLAN features two-fold protection in security. On the hardware side, as with Direct
Sequence Spread Spectrum technology, it has the inherent security feature of
scrambling. On the software side, WLAN series offer the encryption function (WEP) to
enhance security and Access Control. Users can set it up depending upon their needs.
9
What is DSSS
？
What is FHSS
？
And what are their differences
？
Frequency-hopping spread-spectrum (FHSS) uses a narrowband carrier that changes
frequency in a pattern that is known to both transmitter and receiver. Properly
synchronized, the net effect is to maintain a single logical channel. To an unintended
receiver, FHSS appears to be short-duration impulse noise. Direct-sequence spread-
spectrum (DSSS) generates a redundant bit pattern for each bit to be transmitted. This
bit pattern is called a chip (or chipping code). The longer the chip is, the greater the
probability that the original data can be recovered. Even if one or more bits in the chip
are damaged during transmission, statistical techniques embedded in the radio can
recover the original data without-the need for retransmission. To an unintended
receiver, DSSS appears as low power wideband noise and is rejected (ignored) by
most narrowband receivers.
