25 years ago, landline communications in Houston were the only thing that worked during outages (whether we had "fiber" to our SLC hut or copper to the two-story windowless AT&T central office building)
15 years ago, DSL worked for just over a day -- til their suburbia batteries died -- but Comcast cable and TV worked the full ten days without power after Ike hit
* this year we lost power twice for 5+ days and Comcast instantly went down but AT&T gigabit stayed up 100%