PLANET WL-U356A - Manual (Page 29)

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Appendix
This section provides some technology document of IEEE802.11g. Read the
description below to know the standards about IEEE802.11g
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What is the IEEE 802.11g standard?
The IEEE 802.11g Wireless LAN standard subcommittee that formulates the
standard for the industry. The objective is to enable wireless LAN hardware from
different manufactures to communicate.
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What IEEE 802.11 features are supported?
The product supports the following IEEE 802.11 functions:
• CSMA/CA plus Acknowledge protocol
• Multi-Channel Roaming
• Automatic Rate Selection
• RTS/CTS feature
• Fragmentation
• Power Management
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What is Ad-hoc?
An Ad-hoc integrated wireless LAN is a group of computers, each with a WLAN
adapter, Connected as an independent wireless LAN. Ad-hoc wireless LAN is
applicable at a departmental scale for a branch or SOHO operation.
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What is Infrastructure?
An integrated wireless and wired LAN is called an Infrastructure configuration.
Infrastructure is applicable to enterprise scale for wireless access to central
database, or wireless application for mobile workers.
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Can Wireless products support printer sharing?
Wireless products perform the same function as LAN products. Therefore,
Wireless products can work with Netware, Windows 2000/XP/Server 2003, or
other LAN operating systems to support printer or file sharing.
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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.
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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, 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.