The rear-panel indicators consist of LEDs that indicate the status of the fibre-channel ports, Ethernet connection and activity, power, electrical current, and system-board errors.
Figure 1 shows the rear-panel indicators on the SAN Volume Controller 2145-8G4 back-panel assembly.
Fibre-channel LEDs
Ethernet port
1 activity LED
Ethernet port
1 link LED
Ethernet port
2 activity LED
Ethernet port
2 link LED
Power, location, and system
error LEDs
Ac and dc LEDs