Realtek RTL8169 - LINK;ACT LED

RTL8169
2002/03/27 Rev.1.21
63
9.6.5 LINK/ACT LED
In 10/100/1000Mbps mode, blinking of the LINK/ACT LED indicates that the RTL8169 is linked and operating properly. This
LED high for extended periods, indicates that a link problem exists.
Power On
Link?
LED = High
LED = Low
LED = Low for (12 +- 2) ms
No
Yes
Tx/Rx packet?
Yes
No
LED = High for (100 +- 10) ms