Token ring network was introduced in 1985, at a data rate of 4 Mbs. IBM introduced its second type of token ring in 1989 with a data rate of 16 Mbps. Currently, the term token ring is generally used to refer to both IBM's token ring network and IEEE 802.5 networks as there is a little difference between the two types. The main difference of token ring over token bus is that tokens and messages are passed around the ring to each station in the ring in a fixed sequence.
Token ring technology consists of a ring station and a transmission medium. A token ring network uses a wiring concentrator device called Multistation Access Unit (MAU). Physically, token ring is a star topology and electrically it is a ring topology. Each computer in the network connected to the MAU. Each MAU can accomodate upto eight stations. Shielded twisted pair cabling (STP) is used for a 16 Mbps token ring network and unshielded twisted pair cabling (UTP) is used for a 4 Mbps token ring network. Fig. 11.24 shows the token ring topology.
Was this article helpful?
You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.