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4-2 Troubleshooting
Scenario Solution
I can’t find any wireless
access point / wireless
device in ‘Site Survey’
function.
1. Click ‘Rescan’ for few more times and see if you can find any wireless
access point or wireless device.
2. Please move closer to any known wireless access point.
3. ‘Ad hoc’ function must be enabled for the wireless device you wish to
establish a direct wireless link.
4. Please adjust the position of network dongle (you may have to move
your computer if you’re using a notebook computer) and click ‘Rescan’
button for few more times. If you cannot find the wireless access point
or wireless device you want to connect by doing this, try to move closer
to the place where the wireless access point or wireless device is
located.
Nothing happens when I
click ‘Launch Config Utility’
1. Please make sure the wireless network dongle is inserted into your
computer’s USB port. If the Ralink configuration utility’s icon is black,
the network dongle is not detected by your computer.
2. Reboot the computer and try again.
3. Remove the dongle and insert it into another USB port.
4. Remove the driver and re-install.
5. Contact the dealer of purchase for help.
I can not establish
connection with a certain
1. Click ‘Connect’ for few more times.
2. The access point you wish to connect only allows network cards with
specific MAC address to establish connection. Please go to ‘About’ tab
and write the value of ‘Phy_Addess’ down, then present this value to
the owner of access point so he / she can add the MAC address of
your network dongle to his / her access point’s list.
4-3 Glossary
What is the IEEE 802.11g standard?
802.11g is the IEEE standard for high-speed wireless LAN communications that provides for up to 54 Mbps
data rate in the 2.4 GHz band. 802.11g is quickly becoming the next mainstream wireless LAN technology
for the home, office and public networks. 802.11g defines the use of the same OFDM modulation technique
specified in IEEE 802.11a for the 5 GHz frequency band and applies it in the same 2.4 GHz frequency band
as IEEE 802.11b. The 802.11g standard requires backward compatibility with 802.11b.
The standard specifically calls for:
A new physical layer for the 802.11 Medium Access Control (MAC) in the 2.4 GHz frequency band, known
as the extended rate PHY (ERP). The ERP adds OFDM as a mandatory new coding scheme for 6, 12 and
24 Mbps (mandatory speeds), and 18, 36, 48 and 54 Mbps (optional speeds). The ERP includes the
modulation schemes found in 802.11b including CCK for 11 and 5.5 Mbps and Barker code modulation for 2
and 1 Mbps.
A protection mechanism called RTS/CTS that governs how 802.11g devices and 802.11b devices
interoperate.
What is the IEEE 802.11b standard?
The IEEE 802.11b Wireless LAN standard subcommittee, which formulates the standard for the industry.
The objective is to enable wireless LAN hardware from different manufactures to communicate.
What does IEEE 802.11 feature support?
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
What is Ad-hoc?
An Ad-hoc integrated wireless LAN is a group of computers, each has a Wireless LAN card, Connected as
an independent wireless LAN. Ad hoc wireless LAN is applicable at a departmental scale for a branch or
SOHO operation.
What is Infrastructure?
An integrated wireless and 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.