This is kinda funny as I was reading along while adding a modem…

Now we are going to probe the tty port to figure out the type
of modem that is attached.  This takes a few seconds, so be patient.
Note that if you do not have the modem cabled to the port, or the
modem is turned off, this may hang (just go and cable up the modem
or turn it on, or whatever).

Was just a bit comical for me, I s’pose.