>This type of test checks compliance with part 15 of the FCC Rules and Industry Canada RSS-210: this device must accept any interference received, including interference that may cause undesired operation.
I must be missing something. Why would anyone want a device to accept interference?
This is standard boilerplate on consumer electronics. Your everyday consumer electronic devices are supposed to adhere to this rule to minimize their impact on the electromagnetic environment. An EE would probably be able to tell you more.
It means that if your Part 15 device experiences interference from another device, the FCC won't do anything about it, and doesn't want to hear about it.
The clause should really say "the <i>user</i> of this device must accept any interference..."
Another PDF redaction failure. So many people to learn a lesson, so little time.