Just to clear up an earlier comment, Anonymous Freak is correct in saying that you can run SSH over a serial cable if you use TCP/IP over that cable. PPP is one option. SLIP is probably easier for home setups.

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heh. Back in the day, a friend and I were the first commercial SLIP customers in Portland, Oregon.

There were three commercial ISPs, all of which offered command-line only service. A friend and I wrote to the ISP we had an account with, asking them to install SLIP. They did. We promptly got a dial-up SLIP connection up and running, complete with NCSA Mosaic 1.0. Probably the first home users in Portland to browse web pages at home who didn't have a work-provided connection. (I'm sure there were others who had done it through their work before us.)