remote debug over usb vs. old serial cable?

[Ronald Klop]

Hello,

In the past I could catch a panic during boot via a serial cable connected  
to another computer.
My new computer only has USB-ports and ethernet. What kind of cable do I  
need now to do remote debugging?
The old computer also has usb, so I think the connection should be in that  
corner.
They all run 7-STABLE.

Cheers,

Ronald.