Base Switch 1601F

It looks like the 1601F (by LANTECH) is a rack-mountable 10/100 switch with a 100Mbps fiber module. Try this search (Newegg.com) for a list of possible replacements. (Note that several in the list have a 100BaseFX expansion port, but the module for that port may need to be purchased separately.)

More generally, if fiber connectivity, advanced management features, and rack-mountability are not necessary, you can just pick up a 16 port 10/100 switch at your local computer store. If you need more features but this is an emergency, you could pick up the lesser switch to use while you're waiting on the better one.