I’m not sure how often you’d want to access a switch using terminal from a server, but I guess when you desperately need a serial port you do whatever it takes.

Serial port access through Terminal in Leopard Server:

“Having a pressing need to access a Cisco router via the console cable, and not having a PC with a serial port laying around anywhere, I decided to look into how to access the serial port on an Xserve that’s running Leopard Server. Previous hints targeted at Tiger Server and below, however, do not work any more as the serial support files are no longer found in /System » Library » StartupItems/. Through some digging, I found the solution to the problem and can now access the router via the serial port at any time, even from my iPhone (through Terminal, of course)!

Leopard Server moved the SerialTerminalSupport shell script to /usr » libexec » serial. The syntax for launching it remains the same, though, just the location has changed. Thinking that was all it took, I stopped the SerialTerminalSupport service with this command (run all these commands as superuse…”

(Via MacOSXHints.com.)