GDI XC300 Owner's Manual page 13

LED Description
LED Indication
Power Solid GREEN to indicate the unit is powered ON.
VDSL Sync (Active Green) Solid green (ON) to indicate that the end-to
end VDSL link between the XC300 set is established. The
VDSL LED is OFF when the link is down.
Ethernet "Good (Active Green) Solid Green indicates that Ethernet link has
Link" been established.
Ethernet (Active Yellow) Flashes to indicate Ethernet activity on the
"Activity" 10/100Base-T Ethernet port.
Table 1:
Front Panel LED Description
13