I found the RocketPort which says it supports Linux, but it only lists ISA and PCI interfaces, not ethernet.

Then there's the SerialHub which uses ethernet, but only works on WindowsNT.

And there's the SerialHub Si which is described similar to the regular serialhub, and says:

Designed for Intel-based computers...

...once the RocketPort Serial Hub Si is installed, the ports appear as standard (native) Windows COM ports, accessible by any application.

It does list Linux under supported operating systems, but in the context of the page, it almost seems like a typo. Do they have drivers for Linux, or can you just telnet to the termserv from a linux box and have it connect you to a serial port?

How a network device is designed for Intel computers is beyond me. But the specific mention of both Intel and Windows doesn't give me much hope that it will work with the empeg.