Cisco SPA 504G Owner's Manual page 46

Use the included LAN cable; connect one end into the port on the back of
the phone labeled SW and connect the other end into any data port on
your network (router, switch or wall jack).
Option 2: Connect Desk phones using your existing data network then
connect the phones to your computer
If you already have a computer using a wall data jack or router/switch
ports, unplug the computer from the network, then connect the phone
using the steps in Option 1. Plug your computer into the port on the back
of the phone labeled PC.
3. Connect Power to the Desk Phone
Use the included power cord and plug one end into the back of the phone
and the other end into the wall outlet. The phone will indicate that it is
configuring itself. Once the phone has finished its configuration, it is ready
to make and receive phone calls.
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