The document discusses the IEEE 802.4 Token Ring network and Token Bus network topologies. The Token Bus network uses a logical ring topology with stations connected to a linear cable. A token is passed between stations to gain access to transmit, and priority queues are used to ensure real-time traffic can be transmitted. The Token Bus frame format includes fields for destination and source addresses, data, and a checksum without needing a length field. Protocols are required to handle ring initialization and control issues like lost tokens.