Z-World RCM3000, Руководство пользователя

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User’s Manual 23
3.3 Roaming
A Wi-Fi device may need to roam outside the range of a specific access point in order to
perform its functions. Roaming is built into the Wi-Fi CompactFlash cards. As long as cer-
tain conditions are met, the Wi-Fi device will be able to roam from one access point to
another access point.
1. The access points must all be set to the same SSID.
2. The Rabbit-based device that is roaming must also be set to this SSID.
3. If encryption is used (this is recommended), then all the encryption keys must be set to
the same values on all the access points and on the Rabbit-based devices.
The channel may vary from access point to access point—the Rabbit-based device will
select the correct channel automatically. The SSID can be left blank when you configure
your Rabbit-based device, but then the SSID name it originally connects to will be the
only SSID it will accept until your Rabbit-based device is reset. It is probably best to spec-
ify the SSID.
The Wi-Fi CompactFlash card will tend to stay connected to the access point that it is cur-
rently connected to, even if there is a better signal from another access point. However,
once the signal degrades sufficiently, the Wi-Fi CompactFlash card will roam to the better
access point.
Note that it is possible for communication to stall for a short period of time as your Rab-
bit-based device roams. This is because any switches on the network need time to recog-
nize that the Wi-Fi CompactFlash card has moved from one access point to another so that
they can update their internal routing tables.
3.4 Additional Information
802.11 Wireless Networking ; published by O'Reilly Media, provides further information
about 802.11b wireless networks.