So an off-the-shelf Ethernet switch will do. Contemporary 10GBase-T products are generally compatible with ancient 10Base-T. Another fine example of extreme backwards compatibility.
It didn't have DHCP, so I had to configure my laptop with its MAC address, acquire an IP, and then quickly move the cable to the UNIX PC. It didn't have DNS, so I had to manually find the IP of the CS webserver. And it obviously didn't have an HTTP client, so I had to use telnet. But it worked just fine!
http://alliancetesteq.com/equipment/agilent-hp-1670a
So an off-the-shelf Ethernet switch will do. Contemporary 10GBase-T products are generally compatible with ancient 10Base-T. Another fine example of extreme backwards compatibility.