а я вот не помню уже это вот гриновое всё работает на длинах 50+ метров?
Short Reach Mode — This feature provides power savings on a short length of cable. After cable length is analyzed, the power usage is adjusted for various cable lengths. If the cable is shorter than 30 meters for Ten-Gigabit ports and 50 meters for other type of ports, the device uses less power to send frames over the cable, thus saving energy. This mode is only supported on RJ45 GE ports and does not apply to Combo ports. This mode is disabled by default.