DD120 Systems
41
Hardware Overview
Back Panel
Figure 11: DD120 back panel
Mouse
Keyboard
Video
port
Serial
port
eth0
eth1
The back panel is where you connect to a DD120 system with a serial console, a monitor and
keyboard, or through an Ethernet connection. See Figure 11. The Ethernet interfaces eth0 and eth1
are for data transfer to the system or for administrative access over a network. Both Ethernet
interfaces are 1000 Base-T Gigabit copper ports that can accept 10/100 Base-T or Gigabit
connections.
Eth0 and eth1 each have two LEDs, one on each side of the port. When the LED on the left side is
dark, the port has no active connection. When the LED on the left is green, the connection speed is
10/100 Base-T. When the LED on the left is amber, the connection speed is 1000 Base-T gigabit.
The LED on the right flashes amber when the connection is active with network traffic.
Power Supply Unit
A DD120 has one power supply unit. The power unit has an LED that glows green when the unit is
functional. The LED glows amber if the unit has failed, but still has power. The LED also glows
amber when the Data Domain system is turned off but the unit is still plugged in to a live power
source. The LED is dark if the unit has no power.
