HP D3000 Disk Enclosures - Manual (Page 15)

I/O module
The I/O module provides the interface between the disk enclosure and the host.
Each I/O module has two ports that can transmit and receive data for bidirectional operation.
I/O module LEDs
LEDs on the I/O module provide status information about each I/O port and the entire module.
NOTE: The following image illustrates LEDs on the I/O module.
The rear power and UID module includes status LEDs, a 7–segment display for status codes, and
a unit identification (UID) button.
Fault conditions Operating condition Startup condition Indicator
Off Blinking or solid green 1. Port Link
Solid amber Off 2. Port Error
Off A number, representing the
box number, or an
error/warning code. 3. 7–segment display
Off Off Blue 4. UID
Off Solid green Blinking green 5. Health
Blinking or solid amber Off 6. Fault
I/O module 15