A token-ring network for local data communications

Abstract

Technical innovations such as large-scale integrated circuit technology and distributed operating systems have respectively reduced the cost of computing and provided a basis for large networks within the confines of a single building or cluster of buildings in close proximity to one another. Local area networks can provide a systematic approach for interconnecting personal workstations, control units, and central processing units, thereby providing a means for these machines to pass information from one to the other. This paper describes a local area network based on the fundamental concepts of a token-ring. Two main ideas are presented. The first idea concerns the physical topology of the wiring network and its star-ring organization. Next, the logical data flows are overlaid on the physical network to provide control procedures for exchanging data through the network. The resulting system has unique features that produce a local area network with good performance and reliability characteristics.T he present trend toward distributed data processing, coupled with the increased emphasis on office automation and the widespread use of automated office terminals, displays, and computers, has created a demand for a more comprehensive approach to terminal interconnection systems. Personal workstations can increase overall productivity by allowing the individual office workers, both clerical and professional, to share access to host systems, common data bases, peripheral print-

Digital Fabric

“…Chapter 3 discusses the Rev0 DF architecture, which uses a single, synchronous, shared arbitrated bus. Chapter 4 presents the Rev1 DF architecture which is synchronous, one-dimensional token ring architecture [8]. Chapter 5 discusses the Rev2 DF architecture, which, is an extension of the Rev1 DF architecture to a 2D torus packet network [9].…”

“…For implementation in Verilog, spikes are also referred to as pulses in this thesis. The Rev1 DF architecture is synchronous and uses a 1-dimensional token ring network [8], for inter-APP packet communication. For the Rev2 DF architecture, the synchronous Rev1 DF architecture is retained, except that it grows to include a 2-dimensional torus packet network [9].…”

Low-cost networks and gateways for teaching data communications

“…that all stations have an equal chance at transmitting messages). Two of the better known are the slotted ring (typified by the Cambridge Ring [S]) and the token ring (such as the IBM Token Ring [9] and the IEEE 802.5 Token Ring [5]). …”

Performance issues in local-area networks

“…Three different . traffic patterns are assumed: (1) a totally symmetrical situation, (2) a situation where two stations each generate 40 percent of the total traffic, the rest being generated by the other stations in equal amounts, and (3) a situation with one station generating 80 percent of the traffic while again the rest is generated by the other stations. For each of these traffic patterns, the figure shows the mean frame transfer delay averaged over all stations as a function of the total ring information throughput.…”