Both, really.
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68kMLA
Mk.558
Not that I'm aware of. Apple says a GeoPort supports up to 2Mbps, but in my spelunking, I've never seen a device that took advantage of that. The only thing I know of that was specifically designed for GeoPorts was the GeoPort Telecom modem, which was rubbish and nobody liked them.
Even the serial comm programs couldn't take advantage of them. Black Night came out around 1995, and it only goes up to 57600bps.
Even the serial comm programs couldn't take advantage of them. Black Night came out around 1995, and it only goes up to 57600bps.
Mk.558
Nobody really had modems that fast back then: if they did, it was ISDN, which AFAIK used a ISDN card for full potential with two lines at 128Kbps. By the time the GeoPort was relevant, it wasn't: Ethernet was here to stay and if you did something else fast you probably had a proprietary card for it, or you just put up with normal serial port speeds.
Mk.558
9600 8N1 was common and acceptable even in the early 2000s for Palm III handhelds.
Otherwise, no there's no modern stuff that could do it. It wasn't a big market with Apple faltering in the wake of Windows 95, and if it did matter, by 1998 it was a done deal because the iMac G3 came out with USB, and the door closed. (What's with this 420 character limit?)
Otherwise, no there's no modern stuff that could do it. It wasn't a big market with Apple faltering in the wake of Windows 95, and if it did matter, by 1998 it was a done deal because the iMac G3 came out with USB, and the door closed. (What's with this 420 character limit?)
Mk.558
Even the connector doesn't matter. The 9th pin is for 5v at 350mA, the rest is normal Mini-DIN-8. There's only 3 devices I know of that support overclocking beyond 230400bps: DynaTalk (never seen one), TOPS FlashBox (too old, think System 6), and the Farallon EtherWave Mac/PB Adapter (incompatible).
finkmac
there were ISDN geoport devices. 
i have one of these actually. eagle-eyed folks will note that the entire cord appears to be an apple part.
SAGEM also manufactured the A/ROSE ISDN card.
i have one of these actually. eagle-eyed folks will note that the entire cord appears to be an apple part.
SAGEM also manufactured the A/ROSE ISDN card.
if the former, you can't even get the connectors any more, so probably not.