ZyXEL G-200 User Guide - Page 20

ZyAIR G-200 User's Guide To set up an ad-hoc network, configure all wireless clients in ad-hoc network type and use the same SSID and channel. Infrastructure When a number of wireless clients are connected using a single AP, you have a Basic Service Set (BSS). Figure 2-2 BSS Example A series of overlapping BSS and a network medium, such as an Ethernet forms an Extended Service Set (ESS) or infrastructure network. All communication is done through the AP, which relays data packets to other wireless clients or devices connected to the wired network. Wireless clients can then access resource, such as the printer, on the wired network. Figure 2-3 Infrastructure Network Example 2.1.5 Roaming Roaming is where in an infrastructure network, wireless clients are able to switch from one BSS to another as they move between coverage areas. During this period, the wireless client maintains uninterrupted connection to the network. As the wireless client moves from place to place, it scans for the most appropriate AP depending on the signal strength, network utilization or other factors. The following figure depicts a roaming example. When Wireless Client B moves to position X, the ZyAIR in Wireless Client B automatically switches the channel to the one used by Access Point 2 in order to stay connected to the network. 2-2 Using the ZyAIR Utility