Why am I having trouble with Internet connect?

I have just set up a broadband connection using a USB modem on my phone line. I have to reconnect each time I wake the computer from Sleep as the Modem gets its power supply through the USB port. Sometimes it takes several attempts to establish a connection. I have checked the configuration (several times). Is the problem most likely to be:
a) With Internet Connect ?
b) With my ISP?
C) With the modem?
G4 ibook   Mac OS X (10.4.8)  
G4 ibook    

My guess, the modem.
It's probably taking some time for the USB modem to power up, perform its startup tests, load its configuration and be ready to respond to the network.
It's one of the reasons I never recommend USB DSL routers.
If the modem supports direct power (vs. being powered by the USB line) you can try using that - at least that way the modem won't power down and need to do its whole startup process again. Either that or replace the USB modem with an ethernet-based one that won't have this problem.

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