TP-Link TD-W9970 User Manual page 117

You can check it by following the steps below:
1) Is the connection between your PC and the router correct?
The LEDs of LAN port which you link to the device and the LEDs on your PC's adapter should
be lit.
2) Is the TCP/IP configuration for your PC correct?
If the router's IP address is 192.168.1.1, your PC's IP address must be within the range of
192.168.1.2 ~ 192.168.1.254.
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TD-W9970 User Guide