In this article we will discuss ARCNET, will make brief discussion on ARCNET, last article we discuss about Ethernet.

Attached Resource Computer NETwork (ARCNET orARCnet) is a communications protocol for local area networks. ARCNET was the first widely available networking system for microcomputers; it became popular in the 1980s for office automation tasks.

ARCNET is a widely-installed local area network (LAN) technology that uses a token-bus scheme for managing line sharing among the workstations and other devices connected on the LAN.

ARCNet uses the token-passing protocol over a star and bus topology. The star and bus topology combines the flexibility of a star with the simplicity and throughput of a bus. Thus, ARCNet standard has a unique protocol/topology combination: token-passing protocol and Distributed star/bus topology.

Like Ethernet and Controller Area Network (CAN), ARCNET is a data-link layer technology with no defined application layer. ARCnet is an extremely easy-to-install LAN since it offers a flexible topology with few limitations. It can be configured as a simple Star or Bus topology network, or a Combined Star and Bus topology network. The ARCnet card is equipped with a standard BNC female connector  for connection to RG-62 A/U coaxial cable.

ARCnet can be configured in a simple star or bus topology, or in a combined star and bus topology. ARCnet can use unshielded twisted pair (UTP) wiring, coaxial cable, or optical fiber. The primary characteristics of ARCnet include:

■ 2.5 Mbps transmission

■ Support for up to 255 nodes

■ Coax cable lengths up to 2000 feet (600 m)

■ Twisted pair cable lengths up to 400 feet (120 m)

■ Fiber cable lengths up to 8000 feet (2.5 km)


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