TSW200 switch entering error state when connecting specific device [SOLUTION]

[Roman]

I found a solution to the problem which I described in another thread, to which I cannot post because it was closed. Please, move this post to that thread.

As I suspected, there is no problem with the switch. Instead, the problem is caused by a dangerous short to ground in the ASUS’s design of their LAN surge protection branded as “ASUS LANGuard”. There are user reports of similar or much worse issues with PoE switches of other manufacturers with ASUS motherboards: for example, there and there. So, a solution is to avoid connecting the onboard Ethernet port on ASUS motherboards with “LANGuard” to the switch. I am currently using a separate network adapter for mine instead.

For reference, here is how it is described in the ASUS PRIME Z270-K specifications summary:

ASUS unique features
ASUS 5X PROTECTION III

• ASUS LANGuard - Protects against LAN surges, lightning strikes and static-
  electricity discharges

[Roman]

I figured that I probably should provide here a link to the other thread with the description of the problem, so that a link appears in that former thread directing to this new thread with a solution described in the above post.

TSW200 switch entering error state when connecting specific device

I am a happy owner of a TSW200 switch in a low-traffic and low-power network. It is fast, requires no configuration, powers several devices in the network, doesn’t break others, consumes little, and stays cool. That switch has recently refused to accept a computer into the network with an Azuz Prime Z270-K motherboard and an onboard Intel I219-V Gigabit LAN. When the Ethernet cable is connected, the switch stops all traffic. All its LEDs go dark. Then, they start blinking in unison with consist…

[Marija]

Hello,

Thank you for sharing your solution with our community users!

Best regards,