Cable modem active when MacBook is sleeping

my problem: when my new MacBook17 2.33GHz running OS 10.4.8 is put to sleep, the cable modem does not turn off as it did with My PowerBook G4 running OS 10.3.9. The cable mdem indicates "pc detected" and the data light blinks as it does when the MB is up and running. My PowerBook G4 always turned the modem off when sleeping, back on as soon as I activated it. How do I get the Cable modem to recognize sleeping mode with this new computer?

Not sure.
I've been using a wireless router (Airport-Snow and now Airport Express) connected to my cable modem for so long now but I don't recall my cable modem turning completely off when I put my Mac to sleep or when going to sleep automatically when I used a direct Ethernet connection between my Mac and the cable modem but this was also when using 10.0 and 10.1.
Or do you mean by turning off that the "PC Detected" light turns off?

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