28
4 Troubleshooting
This chapter provides solutions to problems usually encountered during the
installation and operation of the adapter.
3. What is the IEEE 802.11g standard?
802.11g is the new 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. 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.
B. A protection mechanism called RTS/CTS that governs how 802.11g devices
and 802.11b devices interoperate.
4. 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 successfully and efficiently.
5. What does IEEE 802.11 feature support
?
The product supports the following IEEE 802.11 functions:
l
CSMA/CA plus Acknowledge Protocol
l
Multi-Channel Roaming
l
Automatic Rate Selection
l
RTS/CTS Feature
l
Fragmentation
l
Power Management
6. What is Ad-hoc
?
An Ad-hoc integrated wireless LAN is a group of computers, each has a
Wireless LAN adapter, Connected as an independent wireless LAN. Ad hoc
wireless LAN is applicable at a departmental scale for a branch or SOHO
operation.
