Each pair has to be put through a transformer for the Ethernet port to work properly, as a rule. That’s the black epoxy-covered block you will inevitably see near an Ethernet port in your device.

The Boulder Fire-Rescue told FOX31 that around 8 a.m., crews were dispatched to the 1300 block of Ithaca Drive after a report of a nonstructure fire. On the scene, crews found that a transformer blew.