[FT-80x / GT-70x / GT-80x] Why the power LED is not lit?

1.　Please check the power cable connection between power
　　adapter and the GT-80X.
2.　GT-80x series require DC 5V / 1.5A minimum power for
　　both Fiber and TP link up operating. Please check the
　　connected power adapter match the power requirement.
　　(The attached external power adapter inside the box is
　　with DC 5V / 2.5A power output.)