Jerry the Phone Guy
Member
- Location
- Jamaica, NY
770.93 also says you can insulate the metallic member instead of grounding it. In other words, lift the ground outside the house! 
And as for the hum on the fiber, I read the post to mean there was a hum from the fiber's metallic member to local house ground, right? If so, I'd say that's normal when you tie any two earthed grounds together (in this case with a butt set).
OTOH, if the hum is on the analog output (POTS side) of the fiber, right in the ONT, that would be quite odd.
And as for the hum on the fiber, I read the post to mean there was a hum from the fiber's metallic member to local house ground, right? If so, I'd say that's normal when you tie any two earthed grounds together (in this case with a butt set).
OTOH, if the hum is on the analog output (POTS side) of the fiber, right in the ONT, that would be quite odd.