Initially, I thought that the reason token ring uses a physical star topology is to make up for the shortcomings of a physical ring. That is: In a ring, when a failure occurs at any point, the system goes down.
However, I have read the following about daisy chains in Wikipedia (emphasis by me):
By connecting the computers at each end, a ring topology can be formed. An advantage of the ring is that the number of transmitters and receivers can be cut in half, since a message will eventually loop all of the way around. When a node sends a message, the message is processed by each computer in the ring. If the ring breaks at a particular link then the transmission can be sent via the reverse path thereby ensuring that all nodes are always connected in the case of a single failure.
So it says that a message can be transmitted in both directions, which ensures the system not to go down in case of a failure at a point.
My question is, if such thing is possible, why this isn't used in token ring as well? If it was used in token ring, then token ring wouldn't need a physical star topology. It could be a physical ring as well.
So is there an error in this Wikipedia article or am I missing something?