[newbie] First modem setup

[Bob]

        I am trying to install a modem, new LM 7.02 
install, and after watching the posts for the last 
week, attempting the following to now avail. 
The modem is not identifying the com port, 
#2, irq 3,
The irq is not ID'ed. Setting up TCP/IP 
connection
        Have attempted to: setserial -a/dev/caul, 
gave me no status report.
        Will reattempt to ED /etc/ppp/options, once 
again, with the intention of adding this: "noauth"

        Your help is most appreciated.

Bob Root