Installing packages from install media
You can't just mount the installation media, because it is a bootable media it has slices that regular CDs don't. To get at the actual packages:
# mount -F hsfs -o ro /dev/dsk/c0t6d0s0 /cdrom
The automounter will probably do this properly. However around here the only way you'll have the automounter is if you've done a SUNWall install, as opposed to the SUNWreq that most systems get. (ie if you have the automounter, you probably have everything else, too, and won't need the install media.)