Side ports on Dell Docking Station?

I have owned a Dell D/Port Advanced Port Replicator, but am still wondering what the second port on the side of it is for. I couldn't find it anywhere in the documentation, and I searched for an answer but couldn't find what I was looking for. On the left side of the D/Port and also the D/Dock I believe there is one USB port, and one other port, as seen here. Can anybody tell me what the second one is?

 

That's 2 USB ports and a headphone jack. You can connect external speakers to the headphone jack.

 

he is correct. thread closed

 

Close enough.

Its a D/bay connector (which has 1 USB at the bottom and proprietary connector at the top-it wont fit a USB plug) and a headphone jack.

Here is a bigger pic of the the D/Bay connector as well as the Pin Assignments:
http://support.dell.com/support/edocs/systems/latd400/smen/pinouts.htm

 

The top port of that is used purely for power. The you can get external optical drives for those laptops (had one on my x300) and it cant get enough power from one usb port.

(This is the same reason why the apple air's optical drive can't work on any other computer but the air, because the laptop has a special usb port that gives more power than other laptops will from one plug.)

 

Ok, thanks for clearing that up. I knew that it wasn't possible to connect two USB devices to these two ports, but didn't know what it was actually used for.

 

Woops... sorry about that... thanks for clearing that up for me Kdawg.

 

now i feel like an idiot

 

I guess thats why they don't give you the power to close threads

 

I have been wondering this for a long time, and finaly found the answer. THANK YOU!!!