February 15, 2020
Amitraj
Token Ring
A token ring network is a local area network (LAN) topology where nodes/stations are arranged in a ring topology. Data passes sequentially between nodes on the network until it returns to the source station. To prevent congestion and collision, a token ring topology uses a token to ensure that only one node/station on the line is used at a time, thereby easily denoting media users of its activity.
-> A token is a special frame of 3 bytes that circulates along the ring of stations
-> A token ring LAN is physically wired as a star topology but configured as a ring topology.
-> The token ring LAN system was standardized by the Institute of Electrical and Electronics Engineers as IEEE 802.5.
-> In the mid-1980s, token ring LAN speeds were standardized between 4 and 16 Mbps.
Token Passing Mechanism in Token Ring
If a station has a frame to transmit when it receives a token, it sends the frame and then passes the token to the next station; otherwise it simply passes the token to the next station. Passing the token means receiving the token from the preceding station and transmitting to the successor station.
The data flow is unidirectional in the direction of the token passing. In order that tokens are not circulated infinitely, they are removed from the network once their purpose is completed. This is shown in the following diagram -
A token ring network is a local area network (LAN) topology where nodes/stations are arranged in a ring topology. Data passes sequentially between nodes on the network until it returns to the source station. To prevent congestion and collision, a token ring topology uses a token to ensure that only one node/station on the line is used at a time, thereby easily denoting media users of its activity.
-> A token is a special frame of 3 bytes that circulates along the ring of stations
-> A token ring LAN is physically wired as a star topology but configured as a ring topology.
-> The token ring LAN system was standardized by the Institute of Electrical and Electronics Engineers as IEEE 802.5.
-> In the mid-1980s, token ring LAN speeds were standardized between 4 and 16 Mbps.
Token Passing Mechanism in Token Ring
If a station has a frame to transmit when it receives a token, it sends the frame and then passes the token to the next station; otherwise it simply passes the token to the next station. Passing the token means receiving the token from the preceding station and transmitting to the successor station.
The data flow is unidirectional in the direction of the token passing. In order that tokens are not circulated infinitely, they are removed from the network once their purpose is completed. This is shown in the following diagram -
