User's Manual Part 1

ZyXEL G-220F User’s Guide
2-2 Wireless LAN Network
2.1.4 Transmission Rate (Tx Rate)
The ZyXEL G-220F provides various transmission (data) rate options for you to select. Options include
Fully Auto, 1 Mbps, 2 Mbps, 5.5 Mbps, 11 Mbps, 6 Mbps, 9 Mbps, 12 Mbps, 18 Mbps, 24 Mbps, 36
Mbps, 48 Mbps, and 54 Mbps. In most networking scenarios, the factory default Fully Auto setting
proves the most efficient. This setting allows your ZyXEL G-220F to operate at the maximum transmission
(data) rate. When the communication quality drops below a certain level, the ZyXEL G-220F automatically
switches to a lower transmission (data) rate. Transmission at lower data speeds is usually more reliable.
However, when the communication quality improves again, the ZyXEL G-220F gradually increases the
transmission (data) rate again until it reaches the highest available transmission rate.
You can select any of the above options. If you wish to balance speed versus reliability, select 54 Mbps in
a networking environment where you are certain that all wireless devices can communicate at the highest
transmission (data) rate. 1 Mbps or 2 Mbps are used often in networking environments where the range of
the wireless connection is more important than speed.
With USB1.1, the ZyXEL G-220F can only transmit at up to 11Mbps.
2.1.5 Wireless Network Application
Wireless LAN works in either of the two modes: ad-hoc and infrastructure.
To connect to a wired network within a coverage area using Access Points (APs), set the ZyXEL G-220F
operation mode to Infrastructure (BSS). An AP acts as a bridge between the wireless stations and the
wired network. In case you do not wish to connect to a wired network, but prefer to set up a small
independent wireless workgroup without an AP, use the Ad-hoc (IBSS) (Independent Basic Service Set)
mode.
Ad-Hoc (IBSS)
Ad-hoc mode does not require an AP or a wired network. Two or more wireless stations communicate
directly to each other. An ad-hoc network may sometimes be referred to as an Independent Basic Service
Set (IBSS).
Figure 2-1 IBSS Example