Internet Gateway shuts down iMac G5 when in sleep mode?

I just installed at&t dsl with an at&t gateway last week. If I put my iMac to sleep, within a few minues it shuts down. If I unplug the gateway cable. It stays asleep until I wake it. Is there any setting, etc. to stop it from shutting down other than unplugging it? Thanks.

The gateway is connected by ethernet cable. If I leave it plugged in, the computer goes into sleep mode and then shuts itself down in a few minues. If I unplug the ethernet cable, it stays asleep until I wake it.

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From the news page here...
http://xlr8yourmac.com/
See if it's related to this...
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if this is NOT a production enviroment - I can try to get you the information .
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Internet Gateway shuts down iMac G5 when in sleep mode?

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