COMM

This paper describes briefly three new Defense data networks, AUTODIN II, SATIN IV and PWIN which employ packet switching technology. It then discusses Defense policy concerning common-user networks and in what circumstances special purpose networks are ...

The Planning Council on Computing in Education and Research is developing a national network to facilitate the sharing of computing resources among colleges and universities in the United States. The low initial volume of traffic and the widespread ...

In this paper the important characteristics of shared and special purpose networks will be examined. The shared networks will include those which are shared among a variety of different types of data services and those which are shared between data ...

The goal of this paper is to present a multi-access technique for Satellite Broadcast Channel Communication which extends the features of the Slotted-ALOHA system to higher Channel Utilization and presents a stable behaviour. The Reservation Upon ...

S-ALOHA channels are intrinsically unstable and must be equipped with proper controls. The function of the controls is to dynamically adjust the ALOHA channel transmission gates in accordance with the dynamic load fluctuations. The purpose of the ...

This paper presents a survey of the state-of-the-art in multibeam antennas, as particularly applicable to data communications satellites, and analyzes a new configuration to meet such specific needs over the U.S. during the 1980's. Three basic forms of ...

An analysis has been performed to examine the tradeoffs between cost and performance for digital data transmission via the communications satellite channel. The model relates both cost and performance to the major parameters of the spacecraft and the ...

A new contention-based demand assignment protocol (CPODA) is described. The protocol is designed to handle packetized data and voice traffic in a multiple access satellite broadcast channel, where the channel is typically shared by hundreds of earth ...

In the past six years of operation, TYMNET has increased from 30 computer nodes to 240 computer nodes spread throughout the United States, Canada and Mexico. Tymnet also provides the equipment, technology and programming for the data base services ...

Datapac is the public, packet-switched data communication network recently introduced into service by the Trans-Canada Telephone System. It supports two distinct categories of services - 'priority' and 'normal', where the priorities are user assigned. ...

This paper describes a maintenance system architecture, partially implemented within Bell Canada, for end-to-end testing and maintenance of data network services. This paper emphasizes the end-to-end, overall, maintenance requirements.

Although a great deal of work on modeling reliability of data communications systems has been done, there are important problems with current models which do not seem to be adequately appreciated, much less solved. Two important problems of this nature ...

Computer networking is now an established technology, and its applications amy be expected to proliferate rapidly. As a result, the design of future operating systems should be influenced by the requirements of networking.

The design of entirely-new ...

The protocol discussed in this paper was developed by many members of the ARPANET community starting in 1969 and continuing through the present. Many individuals and institutions have been members of this community at one time or another over the years. ...

In view of the size and complexity of modern operating systems, this paper proposes their subdivision into a set of smaller functional modules and the implementation of a number of their functions on separate hardware processors. The information ...

Recent developments in data communications standards have been patterned on a hierarchical approach to communications system architecture. A number of independent levels have been identified, and standards development has proceeded at its own pace ...

A method approaching the formal description of protocols is presented. The method -based on formal languages - utilises the relationship between the formal languages and automata and allows the dialogue between two partners/stations, units of equipments,...

Datapac is a nation-wide public packet switching data communications network operated by the Trans-Canada Telephone System. Datapac, as other networks being developed around the world, allows terminals to access its services by using a standard ...

Host-to-host protocols capable of supporting internetworking and reliable transmission have been under development for several years. This paper discusses problems and techniques related to one type of reliable protocol, which features end-to-end ...

Optical-fiber transmission lines appear attractive for a variety of communication applications in which twisted copper pairs and coaxial cables are now used. These applications range from on-premises data links and equipment wiring to interoffice and ...

A Dual-Mode Slotted TDMA Digital Bus has been designed and a prototype system has been built. This type of bus is a hybrid design which provides optimized bandwidth usage when such a system contains a combination of users with high duty cycle and/or ...

This paper considers the problem of congestion in message-switched, or packet-switched, networks, which employ probabilistic routing schemes. A queueing model for the analysis of a local congestion control scheme is presented. Analytic study of the ...

This paper develops a virtual connection model, complete with intruder, for interactive terminal-host communication and presents a set of protection goals that characterize the security that can be provided for a physically unsecured connection. ...

Five years of collaborative development have established message communication as a way of life on the ARPAnet. Many lessons were learned in building the network-wide message system, and it does a generally reliable and efficient job. However, the haste ...

In recent years, very important progress was made in both real-time digital computer communication and real-time digital voice communication, due to the growing importance of geographically distributed computation, the growing need for resource sharing, ...

The paper describes the work done thus far in the development of a means of statistically multiplexing data and encoded voice in a transparent and intelligent network called TI-NET. A review of previous work in packetized voice transmission in a ...