Showing papers on "ATA over Ethernet published in 1990"

A measurement study of diskless workstation traffic on an Ethernet

Abstract: The traffic on a 10-Mb/s Ethernet local-area network that connects diskless workstations to file servers in a university environment is analyzed. The traffic is substantially heavier than has been recorded in previous studies; measured over 1-s intervals, it frequently exceeds 30% of the network bandwidth. The distribution of packet lengths and the patterns of packet interarrival times are interpreted for the three protocols that carry significant traffic: the transmission control protocol (character traffic), the network disk protocol (paging traffic), and the network file system protocol (remote file access traffic). The two latter protocols account for 68% of the packets and 94% of the data bytes on the network. File access to a remote file server generates bursts of traffic that can last several seconds and that demand bandwidths on the order of 120 kB/s, or about 10% of the Ethernet bandwidth. >

Implementing Ethernet in the industrial environment

Abstract: It is pointed out that Ethernet or IEEE Std 8023 CSMA/CD (carrier sense multiple access with collision detection) network technology has migrated from the research lab to the office to the factory floor The factory floor challenges the integrity of this LAN (local area network) standard with high levels of noise, interference, and other environmental hazards It is argued that, with careful planning, implementation, and documentation, Ethernet can succeed on the factory floor when using the right equipment for the application is used In the present work, the different types of media for 8023 network systems are compared to determine their applicability to the industrial environment Emphasis is placed on the media characteristics, the equipment required, the topologies, and the installation considerations and costs for the available media types Using the comparison results, different configurations of the network are examined to determine the advantages and disadvantages for each configuration, primarily noise susceptibility, reliability, and cost >

An Ethernet-like CSMA/CD protocol for high speed bus LANs

Abstract: A collision protocol called piggyback Ethernet which is applicable for fast bus-type networks based on single, uniform, unsegmented, broadcast-type carriers is presented. Although piggyback Ethernet assumes that each station possesses certain global knowledge about the geometry of the network, it is argued that this knowledge can be acquired automatically at a reasonably small expense. The performance of the protocol for very heavy traffic is not worse than the performance of other protocols operating in a completely synchronized manner. The advantage this solution is its very good performance for light loads which is, for practical purposes, not worse than the performance of Ethernet. Moreover, compared to other protocols for fast networks, piggyback Ethernet has quite modest hardware requirements. The network is based on a straightforward bidirectional cable, each station has only one connection to the bus, and the actual length of the carrier is not bigger than the maximum distance between two stations. >

Performance of the Xpress transfer protocol in an Ethernet environment

Abstract: A simulation analysis is presented of the performance of the Xpress transfer protocol (XTP), a high-speed protocol intended for fiber distributed data interface (FDDI) or Ethernet environments. The local area network simulation facility (LANSF) is modified to support virtual circuit simulation, and then used to obtain the XTP performance statistics. The chosen simulation LAN environment is Ethernet. The analysis of XTP shows that it can provide high throughput to transport users for bulk data movement operations such as file transfer. Its bandwidth for short transfers is limited by the necessity of carrying the overhead of packet headers, packet trailers, and acknowledgment packets. However, it is not worse than most other protocols in this respect. >

Performance of Piggyback Ethernet

Abstract: The performance of a new CSMA/CD protocol for a bus-type network is discussed. This protocol, called Piggy back Ethernet, can be viewed as a very simple and natural extension of commercial Ethernet. The performance of Piggyback Ethernet is compared with the performance of several other CSMA/CD protocols. In terms of global average measures, Piggyback Ethernet outperforms commercial Ethernet and all other bus protocols known to the authors. Although it appears to become unfair under heavy traffic conditions, it delivers better performance for all stations, when compared with other protocols. >