Please correct me if I’m wrong, might have breathed in too many soap fumes.
Token Ring sends the packets to every node by passing it from one node and if that node is not the recipient it passes it on to the next node.
Memos were created the day before with a list of recipients then it was passed around till everyone on the list had read it.
We had one case where a line had been strung over a lighting ballast in a janitor closet. Whenever that light was turned on the whole network would go down. Since it was only on for a few minutes intermittently it was a nightmare to find. You would go looking for the a bad terminator and the network would come back before you checked a single one. Good times.