easily, you can't share it from that beige G3. If it was connected to your ibook, and your ibook was running os x or 9, and also if it had an airport card, you could make it run as a software base station. however, since your beige G3 isn't airport-compatible, it wouldn't be able to access the software base station.
if you have a PC running Windows (2000 or XP, I believe), you can share it via a NIC card. hook in the usb adapter and turn on sharing out via the NIC, then connect your ethernet hub. this would suffice, but only if you have a PC.
you may be able to share using the beige G3 and special software. I've read before about certain software for the Mac (classic OS) that lets you share. maybe someone else can recommend a program, or you can check versiontracker.com and search there in the OS 9 section (since that is the OS you're running on the beige G3. with luck, you might find something that will let you output the isdn from the beige G3.
if you have a PC running Windows (2000 or XP, I believe), you can share it via a NIC card. hook in the usb adapter and turn on sharing out via the NIC, then connect your ethernet hub. this would suffice, but only if you have a PC.
you may be able to share using the beige G3 and special software. I've read before about certain software for the Mac (classic OS) that lets you share. maybe someone else can recommend a program, or you can check versiontracker.com and search there in the OS 9 section (since that is the OS you're running on the beige G3. with luck, you might find something that will let you output the isdn from the beige G3.