I think "unaffected" means "even with a single fiber cut, the connection still have sufficient redundancy". With N+1 redundancy, if there's a fiber cut, I won'

I think "unaffected" means "even with a single fiber cut, the connection still have sufficient redundancy". With N+1 redundancy, if there's a fiber cut, I won't call the remaining connection "unaffected", since it's no longer fail-safe.