HP PCI Multiplexer Family Cabling, Diagnostics, and Troubleshooting Manual

Install Port Modules, Fan Out Cable & Power Supply
Verify Module LEDs
Chapter 3 39
Verify Module LEDs
Each port module contains an online LED and power LED indicator
(Figure 3-5). The online LED is not functional until the driver software is
installed. The power LED is illuminated when power is present in the
module.