Lenovo 1047 - Manual (Page 26)

Table 5. Ethernet LEDs
LED State Color Description
On Green 10/100/1000 Mb linked
Blinking Green 10/100/1000 Mb activity
RJ-45 linkage/activity (left)
Off Off No LAN connection.
On Amber 1000 Mb linked and active
On Green 100 Mb linked and active
RJ-45 speed (right)
Off Off 10 Mb mode or no LAN connection.
14 ThinkServer User Guide