Sony Vajo VGC-LT20 Series User Manual page 157

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Troubleshooting
What are channels?
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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.
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If you are using a wireless LAN access point, see connectivity information contained in the manual that came with your
access point.
Why does the network connection stop when I change the encryption key?
Two computers with the wireless LAN functionality may lose a peer-to-peer network connection if the encryption key is
changed. You can either change the encryption key back to the original profile or re-enter the key on both computers so the
key matches.