Time Capsule and 2 macbook at the same time

Hello,
I have a time capsule and 2 macbooks.
Therefore, when my macbook is doing a backup ( every hour), my collegue cannot acces to internet, and cannot backup at the same time.
But it looks like this problem is only one way ( I mean when my collegues backup, I don't have any trouble to go on internet).
Anyone can help? cause it's really annoying.
Thanks

Ngarraud,
Try this:
*Multicast Rate / Transmit Power*
Launch Airport Utility.
Select your Time Capsule on the left.
Click "Manual Setup".
Select "Airport" from the toolbar at the top.
Click the "Wireless" tab.
Click the "Wireless Options..." button.
Check the setting for "Multicast Rate".
This setting controls the range at which you allow devices to access your network. Lower is better if you want access throughout the house. But this setting won't improve speed. Tesserax has a nice explanation of this setting in the following quote:
+"The Multicast Rate option sets the threshold throughput level a wireless client must obtain in order to be "accepted" by the base station. The lower this value, theoretically, the greater number of clients that can connect, especially those at greater distances from the base station. At the opposite end, the higher this number, only those wireless clients that can achieve the higher throughput value will be able to connect.+ [http://discussions.apple.com/thread.jspa?messageID=6736587]
Next, verify that your "Transmit Power: is set to 100%.
*Interference Robustness / Use Wide Channels*
Finally, ensure that "Interference Robustness" is checked (For certain network configurations this setting will say "Use Wide Channels. Verify that it is checked nonetheless.)
Help Doc states: +"You may experience network performance problems if a microwave oven or other source of interference is used frequently near your base station or Time Capsule. To help minimize interference, turn on interference robustness."+
Let us know if this was helpful.
Cheers!

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