Comcast was different back then. They were a much smaller company just starting their growth, and it was before their shared headend started and their NYC DMA presence was a few isolated systems in the fringes of the market. It was mainly the core NYC companies like Time Warner, RCN and Cablevision that got connected to the fiber link, while the ones who only had a presence in Upstate NY, northwestern NJ, CT or PA like Comcast, Adelphia, Blue Ridge, Service Electric and Charter were on their own. The NJ Comcast systems were likely on fiber too, but at the time it probably had no physical link to the Fairfield county systems.
If you ever have time to take a deep dive into the state public utilities commission applications, you might find some of the old franchise renewal filings where they indicated which services they offered at the time and how they were delivered. I'm not sure how far back the CT online archive goes, but the New York State one goes back to the mid 80s.
Last edited by KyL416; 08-19-2019 at 02:51 PM.