History[ edit ] A wide range of different local area network technologies were developed in the early s, of which one, the Cambridge Ringhad demonstrated the potential of a token passing ring topologyand many teams worldwide began working on their own implementations. It used a convenient star-wired physical topology and ran over shielded twisted-pair cabling.
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Token Ring does not inherently support this feature and requires additional software and hardware to operate on a direct cable connection setup. Ethernet alleviates collision jetoane de biți carrier sense multiple access and by the use of an intelligent switch ; primitive Ethernet devices like hubs can precipitate collisions due to repeating traffic blindly.
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Ethernet network interface cards can theoretically operate on a passive hub to a degree, but not as a large LAN and the issue of collisions is still present. Unswitched Ethernet does not have provisioning for an access priority system as all nodes have equal contest for traffic.
By contrast, Ethernet included both the simpler firmware and the lower licensing cost in the MAC chip. Even more significant when comparing overall system costs was the much-higher cost of router ports and network cards for Token Ring vs Ethernet.
The emergence of Ethernet switches may have been the final straw. When a computer has a message to send, it seizes the token.
Gary provides glue logic for bus control and houses supporting functions for the floppy disk drive. It integrates many functions built discretely in the earlier Amiga in order to reduce costs. Gayle[ edit ] Gayle replaced Gary in the A and A Akiko is responsible for implementing system glue logic that in previous Amiga models were found in the discrete chips Budgie, Gayle and the two CIAs.
The computer will then be able to send the frame. The frame is then examined by each successive workstation. The workstation that identifies itself to be the destination for the message copies it from the frame and changes the token back to 0.
When the frame gets back to the originator, it sees that the token has been changed to 0 and that the message jetoane de biți been copied and received. It removes the message from the frame.
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The frame continues to circulate as an "empty" frame, ready to be taken by a workstation when it has a message to send. Although Token Ring runs on LLCit includes source routing to forward packets beyond the local network.
The majority of MAUs are configured in a 'concentration' configuration by default, but later MAUs also supporting a feature to act as splitters and not concentrators exclusively such as on the IBM Cabling and interfaces[ edit ] Cabling is generally IBM "Type-1", a heavy two-pair Ohm shielded twisted pair cable.
Unique hermaphroditic connectorscommonly referred to as IBM Data Connectors in formal writing opțiuni wy colloquially as Boy George connectors were used. The advantages of the connectors being that they are genderless and have superior shielding over standard unshielded 8P8C.
Connectors at the computer were usually DE-9 female.