Identifying Your Panasonic DBS System
The best way to determine which type of system you have is to look at the control unit for the system. You will generally find the control unit mounted on a wall in a utility closet or where the telephone lines come into your building.
If the Control Unit looks like this:
or 
You have a Panasonic DBS 576 Series Telephone System.
If the Control Unit looks like this: (with the power switch on the lower left side)
or like this
You have a Panasonic DBS Classic series system.
If the Control unit looks like this:
You have a Panasonic SDBS system.
