Attached Resource Computer Network
 
Arcnet is a widely-installed technology from the Datapoint Corporation, the originator of the local area network. Arcnet uses a token-bus scheme for managing line sharing among the workstations and other devices connected on the LAN. The LAN server continuously circulates empty message frames on a bus (a line in which every message goes through every device on the line and a device uses only those with its address). When a device wants to send a message, it inserts a "token" (this can be as simple as setting a token bit to 1) in an empty frame in which it also inserts the message. When the destination device or LAN server reads the message, it resets the token to 0 so that the frame can be reused by any other device. The scheme is very efficient when traffic increases since all devices are afforded the same opportunity to use the shared network.

Arcnet can use coaxial cable or fiber optic lines. Cable lengths can be up to 2,000 feet per segment with a total network span of 20,000 feet without bandwidth loss. Arcnet's bandwidth or information flow capacity is 2.5 Mbps. Of the four major LAN technologies (which also include Ethernet, Token Ring, and Fiber Distributed-Data Interface), Arcnet is said to be the least expensive to install.