Netopia R5100 User Reference Manual page 25

The figure below represents the Netopia R5000 Series Router status light (LED) panel.
Netopia R5000 Series Router LED front panel
WAN 1
The following table summarizes the meaning of the various LED states and colors:
When this happens...
The corresponding line passes supervisory traffic between
the WAN and the Netopia R5000 Series Router
The WAN interface is operational
The line is unavailable
The WAN has carrier
Data is transmitted or received on the WAN
Carrier is asserted
Data is transmitted or received
Data is transmitted or received by the Ethernet controller
The Ethernet interface detects a collision
Link is detected
Data are received on their respective ports
Note: Channel 2 (#5) and WAN 2 (#8 through #11) are unused, since traffic is carried only on WAN channel
1. Also, Console carrier (6) is ignored if the console is not configured for a remote modem.
WAN 2 Ethernet
2 flashes yellow.
3 is green.
3 flashes red.
4 is green.
4 flashes yellow.
6 and 7 are green.
6 and 7 flash yellow.
12 flashes yellow.
13 flashes red.
14 though 21 are solid green.
14 though 21 flash green.
Making the Physical Connections 3-5
Link/Receive
the LEDs...