IBM xSeries 330 - Manual (Page 73)

Chapter 5. Installing options 65
C2T chaining cable
The C2T Chaining cable is designed to prevent the accidental connection of two OUT
connectors with physically different connector shells and different color connector
covers (Black = OUT, White = IN).
C2T breakout cable
A keyboard, monitor, and mouse or pointing device are connected to the server
through the device breakout cable. The keyboard and mouse cables have icons of a
keyboard and a mouse on their respective cable connectors for easy identification.