Mini DisplayPort
Mini DisplayPort displays and adapters can be connected to the Thunderbolt port of a Mac. You can connect these peripherals as part of a device chain:
Mini DisplayPort Does NOT Pass Thunderbolt Signals
Because Thunderbolt devices pass Mini DisplayPort signals, but not the reverse, it is important that you attach Mini DisplayPort devices either directly to the computer or as the last device(s) on a Thunderbolt chain. There is no passthrough port on a Mini DisplayPort display or video adapter. Remember that although the connectors may look similar, you can differentiate a Mini DisplayPort connector from Thunderbolt by the logo on the cable or port.