User's Guide

12/6/2019
27
The meaning for each LED on the CU is shown in the table below.
CU LED TABLE
LED Label
LED State
Meaning
PWR
SOLID GREEN
NORMAL OP (S1)
SOLID RED
HARDWARE ERROR
FLASHING GREEN
NETWORK
SCANNING
FLASHING RED
Error
NU LINK
SOLID GREEN
Logical Link: Up
OFF
Logical Link: Down
CABLE LINK
SOLID GREEN
Physical Link: Up
OFF
Physical Link: Down