Cable Television Local Insertion Advertising

[RetroToledo]

This was common in the early 80's and was often the result of the use of DTMF tones that some cable networks would use for local cable operators to insert these promos automatically into the feed for those channels that usually lasted a minute at a time. My local cable company often simply just use a cheap video titler to insert their phone number over channel promos for Showtime and such to inform you on subscribing to them.