Sony VGN-FS550 - Manual (Page 157)

What are channels?
Wireless LAN communication occurs on divided frequency bands known as channels. Third-party wireless LAN access point
channels may be preset to different channels from Sony devices. Computers adhering to the IEEE 802.11b and IEEE
802.11g standards operate at a different frequency band than computers using the IEEE 802.11a standard.
If you are using a wireless LAN access point, refer to connectivity information contained in your access point instructions.
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