ARCNet (Attached Resources computer network) is a cross-linking technology for local of networks (LANs). It defines cable types and signaling for the (physical layer) and package formats and minutes for the medium access supervision (Media Access Control, MAC) /Sicherungsschicht the OSI model.

Inventor of the network was the company DATA POINT 1976.

ARCNet is developed physically as star and/or a tree. The switching components can be active or passive of stroke, whereby active and passive of stroke can be mixed at will. In the original form ARCNet with coaxial cables was developed. In the course of the development also UTP and glass fiber were specified.

The coaxial cables correspond not from Thin the Ethernet admitted type RG-58 (with a characteristic impedance of 50 ohms) separate RG-62 with a characteristic impedance of 93 ohms. The connection at stroke and computer effected alternatively in star configuration directly by BNC plug connectors without the T-fitting to the stroke, well-known by Thin Ethernet, whereby no terminal resistance is necessary, since the time limitation of the cables takes place directly in the stroke and/or on the map. The second variant as bus is just as verkabelt with T-fittings as Thin Ethernet and has also terminal resistances at the cable end.

The access procedure of ARCNet is token bus. Here, similarly as with the access procedure token ring a token is sent on the journey, which is passed on in a fixed order. With token ring this is given by the wiring. With ARCNet that is always sent tokens into the entire network, and the next station in a logical order takes up that tokens. The sequence is to be given to the maps as knot ID (sequential numbering) on an outside accessible DIP SWITCH; with current products the ARCNet ID is communicated to the map about the software.

The data transmission rate lies with 2,5 Mbit/s (20 Mbit/s by employment of ARCNet plus maps) lower than Ethernet and token ring. Since however, as with token ring, no collision could brake the speed of the transmission, a good speed can be attained also with this data transmission rate.

ARCNet lost its meaning with the further spreading of nearly Ethernet in local networks; in the industriellen manufacturing still one uses.

Related links

• Arcnet user Group
• ARCNET trade Association (English)
• European manufacturer of ARCNet products

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