Token Bus Network
Token Bus Network
A token bus network is a type of local area network (LAN) where a single token circulates among workstations, and a station can transmit data only when it possesses the token. This ensures that only one workstation can transmit at a time, preventing data collisions and maintaining network efficiency.
What does Token Bus Network mean?
A token bus network is a type of local area network (LAN) in which all nodes are connected to a single bus and communicate by passing a token around. The token is a special Message that gives the node holding it permission to Transmit data. Only the node holding the token can transmit data, and all other nodes must wait their turn.
Token bus networks are more efficient than other types of LANs, such as Ethernet, because they reduce the number of collisions that can occur when two or more nodes attempt to transmit data at the same time. Collisions occur when two or more nodes transmit data at the same time, and the data packets collide and are destroyed. In a token bus network, collisions are avoided because only the node holding the token can transmit data.
Token bus networks are also more reliable than other types of LANs because they can be configured to use a backup token. If the primary token is lost, the backup token can be used to keep the network running.
Applications
Token bus networks are used in a variety of applications, including:
- Factory automation: Token bus networks are used to connect programmable logic controllers (PLCs) and other devices in factory automation systems.
- Building automation: Token bus networks are used to connect building automation systems, such as lighting, heating, and ventilation systems.
- Transportation: Token bus networks are used to connect traffic signals and other devices in transportation systems.
- Healthcare: Token bus networks are used to connect medical devices, such as patient monitors and infusion pumps.
Token bus networks are important in technology today because they provide a reliable and efficient way to connect devices in a variety of applications.
History
The token bus network was developed in the early 1980s by IBM. The first token bus network was installed in 1984. Token bus networks were popular in the 1980s and 1990s, but they have since been replaced by other types of LANs, such as Ethernet.
Token bus networks are still used in some applications, such as factory automation and building automation. However, they are no longer as popular as they once were.