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General
Questions
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Q24:
I can not start utility program neither using
the icon nor by clicking the exe file on Windows XP?
Q23:
What is a wireless LAN “Access Point”?
Q22: What is a wireless
LAN “Infrastructure”?
Q21: What is wireless
LAN “Roaming”?
Q20: What is SSID?
Q19: What is a wireless
LAN “Ad-Hoc”?
Q18: What is the difference
between "Ad Hoc" mode and "802.11 Ad Hoc" mode?
Q17: What is the basic
requirement to make Ad Hoc mode work?
Q16: What is wireless
LAN “Authentication Type”?
Q15:
What is “Basic Rate”?
Q14: What is “Beacon”?
Q13: What is “BSS”?
Q12: What is “ESS”?
Q11: What is “ESSID”?
Q10: What is “ISM Band”?
Q09: What is wireless
LAN Radio Channel?
Q08: Why wireless LAN
use CSMA/CA protocol?
Q07: What is “DSSS”?
Q06: What is “Encryption”?
Q05: What is “Fragmentation
Threshold”?
Q04: What is “Multicasting”?
Q03: What is “Preamble
Type”?
Q02: What is “RTS Threshold”?
Q01: What is “WEP”?
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Q24:
I can not start utility program neither using the icon nor by
clicking the exe file on
Windows XP?
(2004/10/5)
Please
open start / settings / control panel / system management utilities
/ service to check "Wireless Zero Configuration" service
is existed and the service is started automatically.
-If the service is not started automatically please change it to
"automatically" and start this service.
-If the service does not exist please open start/run and type
“regedit” then press enter.
To find HKEY_LOCAL_MANCHINE/SYSTEM/CURRENT_CONTROL_SET/SERVICES/WZCSVC
and ADD
DWORD "START", VALUE = 2 then reboot the computer.
It
is a known bug for Windows XP to upgrade service pack 1 without
disable Wireless Zero Configuration utility. If possible, please
upgrade the card driver/utility version to the latest release.
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Q23:
What is a wireless LAN “Access Point”?
An
internetworking device that seamlessly connects wired and wireless
networks.
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Q22:
What is a wireless LAN “Infrastructure”?
An
infrastructure network is a wireless network or other small network
in which the wireless network devices are made a part of the network
through the Access Point which connects them to the rest of the
network.
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Q21:
What is wireless LAN “Roaming”?
A LAN mobile
user moves around an ESS and enjoys a continuous connection to an
Infrastructure network.
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Q20:
What is SSID?
SSID is
Service Set Identifier, which is a unique name shared among all
clients and nodes in a wireless network. The SSID must be identical
for each clients and nodes in the wireless network.
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Q19:
What is a wireless LAN “Ad-Hoc”?
An
independent wireless LAN network formed by a group of computers,
each with an network adapter.
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Q18:
What is the difference between "Ad Hoc" mode and
"802.11 Ad Hoc" mode?
The card set
in Ad Hoc mode will not check SSID to get connected with other card.
The card set in 802.11 Ad Hoc mode will check SSID to get connected
with other card. (2002/5/20)
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Q17:
What is the basic requirement to make Ad Hoc mode work?
To make two
wireless LAN nodes to talk in Ad Hoc mode, they must be set:
1. The same SSID
2. The same radio frequency (RF) channel
3. The same IP network address
It's better not to use "any" for SSID. If you set so, it
maybe connected to wrong partners if there is any other wireless LAN
available. (2002/5/20)
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Q16:
What is wireless LAN “Authentication
Type”?
Indication
of an authentication algorithm which can be supported by the Access
Point:
1. Open System: Open System authentication is the simplest of the
available authentication algorithms. Essentially it is a null
authentication algorithm. Any station that requests authentication
with this algorithm may become authenticated if 802.11
Authentication Type at the recipient station is set to Open System
authentication.
2. Shared Key: Shared Key authentication supports authentication of
stations as either a member of those who knows a shared secret key
or a member of those who does not.
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Q15:
What is “Basic Rate”?
The fixed
transmitted and receiving data rate allowed by the AP with the value
1,2,5.5,11 and 22 Mbps for selection.
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Q14:
What
is “Beacon”?
A beacon is a
packet broadcast by the Access Point to keep the network
synchronized.
Included in a beacon are information such as wireless LAN service
area, the AP address, the Broadcast destination addresses, time
stamp, Delivery Traffic Indicator Maps, and the Traffic Indicator
Message (TIM).
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Q13:
What
is “BSS”?
BSS stands
for “Basic Service Set”. It is an Access Point and all the LAN
PCs that associated with it.
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Q12:
What
is “ESS”?
ESS stands
for “Extended Service Set”. More than one BSS is configured to
become Extended Service Set. LAN mobile users can roam between
different BSSs in an ESS.
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Q11:
What
is “ESSID”?
The unique
identifier that identifies the ESS. In infrastructure association,
the stations use the same ESSID as AP’s to get connected.
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Q10:
What
is “ISM Band”?
The FCC and
their counterparts outside of the U.S. have set aside bandwidth for
unlicensed use in the ISM (Industrial, Scientific and Medical) band.
Spectrum in the vicinity of 2.4GHz, in particular, is being made
available worldwide.
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Q09:
What is wireless LAN Radio
Channel?
The bandwidth
which wireless Radio operates is divided into several segments,
which we call them “Channels”. AP and the client stations that
it associated work in one of the channels.
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Q08:
Why wireless LAN use CSMA/CA protocol?
The CSMA/CA
in local area networking technique that combines slotted
time-division multiplexing with carrier sense multiple
access/collision detection (CSMA/CD) to avoid having collisions
occur a second time. This works best if the time allocated is short
compared to packet length and if the number of situations is small.
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Q07:
What is “DSSS”?
DSSS is
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.
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Q06:
What is “Encryption”?
A security
method that uses a specific algorithm to alter the data transmitted,
thus prevent others from knowing the information transmitted.
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Q05:
What is “Fragmentation Threshold”?
When
transmitting a packet over a network medium, sometimes the packet is
broken into several segments, if the size of packet exceeds that
allowed by the network medium.
The
Fragmentation Threshold defines the number of bytes used for the
fragmentation boundary for directed messages. The purpose of
"Fragmentation Threshold" is to increase the transfer
reliability thru cutting a MAC Service Data Unit (MSDU) into several
MAC Protocol Data Units (MPDU) in smaller size. The RF transmission
cannot allow transmit too big frame size due to the heavy
interference caused by the big size of transmission frame. But if
the frame size is too small, it will create the overhead during the
transmission.
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Q04:
What is “Multicasting”?
Multicasting
is sending data to a group of nodes instead of a single destination.
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Q03:
What is “Preamble Type”?
PLCP is
Physical layer convergence protocol and PPDU is PLCP protocol data
unit
During
transmission, the PSDU shall be appended to a PLCP preamble and
header to create the PPDU. Two different preambles and headers are
defined as the mandatory supported long preamble and header which
interoperates with the current 1 and 2 Mbit/s DSSS specification as
described in IEEE Std 802.11-1999, and an optional short preamble
and header. At the receiver, the PLCP preamble and header are
processed to aid in demodulation and delivery of the PSDU. The
optional short preamble and header is intended for application where
maximum throughput is desired and interoperability with legacy and
non-short -preamble capable equipment is not consideration. That is,
it is expected to be used only in networks of like equipment that
can all handle the optional mode. (IEEE 802.11b standard) PSDU ?
PLCP service data unit.
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Q02:
What is “RTS Threshold”?
RTS is
Request To Send. It is a signal sent from the transmitting station
to the receiving station requesting permission to transmit.
Transmitters contending for the medium may not be aware of each
other. RTS/CTS mechanism can solve this “Hidden Node Problem”.
If the packet size is smaller than the preset RTS Threshold size,
the RTS/CTS mechanism will NOT be enabled.
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Q01:
What is “WEP”?
WEP is Wired
Equivalent Privacy (WEP) is an encryption scheme used to protect
wireless data communication. To enable the icon will prevent other
stations without the same WEP key from linking with the AP.
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EUSSO
Technologies, Inc. is a dedicated data communication and networking
company. With professional experiences in design, production,
marketing and service support, we deliver the full range networking
products including Gigabit Ethernet, Fiber Optic, Wireless LAN,
Switches, Hubs, LAN cards, PCMCIA adapters, Converter, Transceivers.
As well as Internet Telephony Gateway, Print Servers, Broadband Router
and many others.
Copyright
EUSSO Technologies, Inc. 2003
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