INNACOMM W3400V, Руководство пользователя

Страница: 95 / 136

92
internal file transfers or streaming video. However, 54-mbps, corporate-oriented
802.11a is expensive and because its radio uses the 5-GHz band and 802.11b
uses the 2.4 GHz band, upgrading to an 802.11a network means either scrapping
802.11b gear or buying even-pricier hardware that can support both standards.
But 802.11g promises the same speed as 802.11a and the ability to coexist with
802.11b equipment on one network, since it too uses the 2.4-GHz band. 802.11g is
an extension to 802.11b, the basis of many wireless LANs in existence today.
802.11g will broaden 802.11b's data rates to 54 Mbps within the 2.4 GHz band
using OFDM (orthogonal frequency division multiplexing) technology. Because of
backward compatibility, an 802.11b radio card will interface directly with an 802.11g
access point (and vice versa) at 11 Mbps or lower depending on range. You should
be able to upgrade the newer 802.11b access points to be 802.11g compliant via
relatively easy firmware upgrades.
Similar to 802.11b, 802.11g operates in the 2.4GHz band, and the transmitted
signal uses approximately 30MHz, which is one third of the band. This limits the
number of non-overlapping 802.11g access points to three, which is the same as
802.11b.
Note : Maximum wireless signal rate based on IEEE Standard 802.11g
specifications is 54 Mbps. But actual data throughput varies depending
on.network conditions and environmental factors, including volume of
network traffic, building materials and construction, and network overhead
will cause lower actual data throughput rate.
3.5.1.9 Access Point and Wireless Fidel
The Wi-Fi certification ensures that your Modem will interoperate with any Wi-Fi
certified 802.11g and 802.11b compliant wireless device.
The Modem Wireless LAN Access Point (AP) behaves as a networking hub
allowing to wirelessly interconnect several devices to the local (W) LAN and to
provide access to the Internet.
3.5.2 Wireless
–
Basic
This page allows you to configure basic features of the wireless LAN interface. You
can enable or disable the wireless LAN interface, hide the network from active
scans, set the wireless network name (also known as SSID) and restrict the