I recently worked with a client who experienced a transient on their Ethernet cabling. As you can see, no actual PCs were damaged, only the Ethernet cards of some machines. We don't know where the surge originated.
Can anyone explain how the damage could have occurred as shown? I thought Ethernet had isolation transformers at each connector which would likely stop surges from propagating.
Damaged nodes are highlighted in red. Note that main network stack in the center has AC mains surge protection.
Also note that the main network switch was completely destroyed - i.e. would not even power on.
As a follow-up, would Ethernet surge protection hardware be helpful for preventing this type of damage? If so, where in this diagram should it be installed? main stack or at each PC?