Real-time experiments present special problems to a time-shared computer system. For example, simulations, waveform analysis, waveform generations, and displays require very high-rate, closely timed input-output between the digital computer's core memory and external devices. In many cases, conventional input/output methods fail to satisfy the requirements of the experiment. For this reason we have developed the concept of a special purpose 'Hybrid Processor' to perform real-time input/output....
Topics: DTIC Archive, Strollo, Theodore R, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *ANALOG COMPUTERS,...
The basic function of the IMP computer network is to allow large existing time-shared (Host) computers with different system configurations to communicate with each other. Each IMP (Interface Message Processor) computer accepts messages for its Host from other Host computers and transmits messages from its Host to other Hosts. Since there will not always be a direct link between two Hosts that wish to communicate, individual IMPs will, from time to time, perform the function of transferring a...
Topics: DTIC Archive, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DIGITAL COMPUTERS, COMPUTER PROGRAMMING,...
The basic function of the IMP computer network is to allow large existing time-shared (Host) computers with different system configurations to communicate with each other. Each IMP (Interface Message Processor) computer accepts messages for its Host from other Host computers and transmits messages from its Host to other Hosts. Since there will not always be a direct link between two Hosts that wish to communicate, individual IMPs will, from time to time, perform the function of transferring a...
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DATA TRANSMISSION SYSTEMS,...
We describe the test programs developed, the testing procedure used, and the technical problems encountered in installing the initial IMP. Also, we outline several new features that have been incorporated into the operational IMP program.
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DATA TRANSMISSION SYSTEMS,...
The basic function of the IMP (Interface Message Processor) computer network is to allow large existing time-shared (Host) computers with different system configurations to communicate with each other. As there will not always be a direct link between two Hosts that wish to communicate, individual IMPs will, from time to time, perform the function of transferring a message between Hosts that are not directly connected. This then leads to the two basic IMP configurations - interfacing between...
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DATA TRANSMISSION SYSTEMS,...
The basic function of the IMP computer network is to allow large existing time-shared (Host) computers with different system configurations to communicate with each other. Each IMP (Interface Message Processor) computer accepts messages for its Host from other Host computers and transmits messages from its Host to other Hosts. Since there will not always be a direct link between two Hosts that wish to communicate, individual IMPs will, from time to time, perform the function of transferring a...
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DATA TRANSMISSION SYSTEMS,...
The report describes several aspects of progress on the ARPA Computer Network during the second quarter of 1970. During this period, IMPs Nos. 6, 7, 8, and 9 were installed at MIT, Rand, SDC, and Harvard, respectively. AT+T has not yet provided circuits to Harvard, but the eight-node subnet is operational. The temporary circuit connecting BBN and UCLA was taken down and replaced by a circuit between BBN and Rand. A circuit that is listed as temporary was installed between MIT and Utah.
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DIGITAL COMPUTERS,...
The objective of the research is to develop techniques to facilitate natural communication with computers, people, other computers, and real-time devices. The work has been carried on as an integrated research program; work on semantic automatic language processing and automatic programming aids was performed and work on the development of time-sharing systems was done. In accordance with a responsibility to report the results of this investigation the authors have prepared a number of...
Topics: DTIC Archive, Bobrow, Daniel G, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMPUTER PROGRAMMING,...
The basic function of the IMP computer network is to allow large existing time-shared (Host) computers with different system configurations to communicate with each other. Each IMP (Interface Message Processor) computer accepts messages for its Host from other Host computers and transmits messages from its Host to other Hosts. Since there will not always be a direct link between two Hosts that wish to communicate, individual IMPs will, from time to time, perform the function of transferring a...
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DIGITAL COMPUTERS,...
The basic function of the IMP computer network is to allow large existing time-shared (Host) computers with different system configurations to communicate with each other. Each IMP (Interface Message Processor) computer accepts messages for its Host from other Host computers and transmits messages from its Host to other Hosts. As there will not always be a direct link between two Hosts that wish to communicate, individual IMPs will, from time to time, perform the function of transferring a...
Topics: DTIC Archive, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DIGITAL COMPUTERS, CONTROL SEQUENCES, DATA...
The Quarterly Technical Report, No. 10, describes aspects of the work on the ARPA Computer Network during the second quarter of 1971. Efforts during this period were devoted primarily, though not exclusively, to the Terminal IMP. The quarter saw the ARPA Network remain stable in size; the opportunity was used to study traffic in the net, to plan and implement improvements in the operation of the Network Control Center at BBN, to discover and correct some minor bugs in the operational IMP...
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMPUTER NETWORKS, CONTROL...
The Quarterly Technical Report, Number 11, describes aspects of work on the ARPA Computer Network during the third quarter of 1971. The efforts during this quarter were again primarily devoted to the Terminal IMP (TIP). The first two TIP field installations were made during the quarter, the TIP program was refined, additional terminals tested, and a preliminary TIP User;s Guide was published. Section 2 describes Terminal IMP developments in greater detail.
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DIGITAL COMPUTERS, DATA...
The report describes aspects of work on the ARPA Computer Network during the last quarter of 1971. The first Model 316 IMP was installed in the field and two additional Terminal IMPs were delivered. The Model 316 IMP, which was installed at ETAC (Environmental Technical Applications Center, Washington, D.C), will be replaced by a Terminal IMP during the first quarter of 1972. The performance of the installed Terminal IMPs is discussed.
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DIGITAL COMPUTERS, DATA...
Contents: TIP magnetic tape option; IMP buffering requirements for special circuits; Transmission and flow control.
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DATA PROCESSING, *DIGITAL...
The report describes work on the ARPA Computer Network during the second quarter of 1972. The following topics are discussed: NCC operation; Release of new system software; and High speed modular IMP: Design concepts; Switch design; Processor selection criteria; and The Lockheed SUE processor.
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DATA PROCESSING, *DIGITAL...
The Quarterly Technical Report, Number 15, describes the aspects of work on the ARPA computer network during the third quarter of 1972. The subjects discussed include the following: Overview; Revision of the magnetic tape option; Satellite techniques; HSMIMP program organization.
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DATA PROCESSING, *DIGITAL...
The basic function of the ARPA computer network is to allow large existing computers (Hosts), with different system configurations, to communicate with each other. Each Host is connected to an Interface Message Processor (IMP), which transmits messages from its Host(s) to other Hosts and accepts messages for its Hosts(s) from other Hosts. There is frequently no direct communication circuit between two Hosts that wish to communicate; in these cases intermediate IMPs act as message switchers. The...
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DATA PROCESSING, *DIGITAL...
A major activity during the first quarter has been making Interface Message Processors (IMP)s less sensitive to hardware failures in themselves or their neighbors. The motivation for, and conclusions of, this effort are described. Work on the High Speed Modular IMP (HSMIMP) continued through the first quarter. A survey and progress report on the HSMIMP development is described. The problems of subnetwork routing are studied. Satellite communications effort centered around three areas: study of...
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DATA PROCESSING, *DIGITAL...
The ARPA computer network provides a communication medium which allows dissimilar computers (Hosts) to interchange information. Each Host is connected to an Interface Message Processor (IMP), and IMPs are interconnected by leased common carrier circuits. There is frequently no direct circuit between two communicating Hosts, and the intermdeiate IMPs store and forward the information. IMPs regularly exhange information which is used to adapt routing to changing network conditions. IMPs also...
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DATA PROCESSING, *DIGITAL...
A report is made on the development of interactive capabilities in the SCHOLAR CAI system. Tutorial mode is based on extensive analysis of dialogues between different tutors and students, performed earlier. In this mode SCHOLAR first questions the student to find out what he knows about each topic, and then presents some related information limited to what the student can assimilate. Block-test mode is based on the strategy used in programmed instruction. In this mode SCHOLAR first presents...
Topics: DTIC Archive, Collins, Allan M, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *EDUCATION, ADAPTIVE...
The ARPA computer network provides a communication medium which allows dissimilar computers (Hosts) to interchange information. Each Host is connected to an Interface Message Processor (IMP), and IMPs are interconnected by leased common carrier circuits. There is frequently no direct circuit between two communicating Hosts, and the intermediate IMPs store and forward the information. IMPs regularly exchange information which is used to adapt routing to changing network conditions. IMPs also...
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *DATA PROCESSING, *DIGITAL...
The ARPA computer network provides a communication medium which allows dissimilar computers (Hosts) to interchange information. Each Host is connected to an Interface Message Processor (IMP), and IMPs are interconnected by leased common carrier circuits. There is frequently no direct circuit between two communicating Hosts, and the intermediate IMPs store and forward the information. IMPs regularly exchange information which is used to adapt routing to changing network conditions. IMPs also...
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
During this quarter most of the work in distributed computing was directed toward bringing the TIP login and accounting system into operational status. A TENEX implementation of the Internetwork Transmission Control Program specified by Kahn and Cerf in the May 1974 IEEE Transactions on Communications was completed. This program will support planned Internet experiments between BBN-TENEX, a PDP-11 at Stanford University, and a PDP-9 at University College London.
Topics: DTIC Archive, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS, *DATA PROCESSING...
This report describes continuing refinement of the TENEX RSEXEC distributed file system which supports geography-independent computing on a number of ARPANET TENEX sites. It also describes efforts to upgrade existing ARPANET message service to meet NAVY requirements for an interactive message processing test at CINCPAC.
Topics: DTIC Archive, Burchfiel, J, Thomas, R, Myer, T, Tomlinson, R, BOLT BERANEK AND NEWMAN INC CAMBRIDGE...
The ARPA computer network is a packet-switching store-and-forward communications system designed for use by computers and computer terminals. After a brief overview of various aspects of network operations and network- related developments, network performance is studied in detail including discussion of a number of software changes aimed at performance improvement. Some future network developments are discussed in brief. A final installment on the subject of TIP access control and accounting...
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
The ARPA computer network is a packet-switching store-and-forward communications system designed for use by computers and computer terminals. This report describes aspects of the work in network operation; Terminal IMP access control and accounting; Private Line Interface design, construction, and checkout; Pluribus IMP construction and checkout; sizeable changes to the IMP message-processing algorithms; and Satellite IMP issues. The IMP message- processing algorithms have been completely...
Topics: DTIC Archive, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS, *DATA PROCESSING...
This report describes continuing refinement of the TENEX RSEXEC distributed file system which supports geography-independent computing on a number of ARPANET TENEX sites. It also describes efforts to upgrade existing ARPANET message service to meet NAVY requirements for an interactive message processing test at CINCPAC.
Topics: DTIC Archive, Burchfield, J, Thomas, R, Myer, T, Tomlinson, R, BOLT BERANEK AND NEWMAN INC...
This report presents the results of studies performed to support the implementation of a worldwide seismic data collection network using a mix of ARPA Network and leased line communications. Host level protocols for the ARPA Network links are specified. An analysis of the traffic generated by the seismic data subnet identified potential limits imposed by the bandwidth and buffer capacity at two nodes of the network. Operational monitoring and diagnostic procedures are recommended. A backup plan...
Topics: DTIC Archive, Briscoe, Howard W, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS...
The ARPA computer network is a packet-switching store-and-forward communications system designed for use by computers and computer terminals. This Quarterly Technical Report Briefly describes various aspects of network operation and maintenance (installation of IMPs security activities, Network Control Center program modifications, network hardware maintenance, and developments related to the Terminal IMP, 316 IMP, Pluribus IMP, and Satellite IMP) and presents in detail a systematic method for...
Topics: DTIC Archive, Heart, Frank E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATION SATELLITES,...
The ARPA Computer Network is a packet-switching store-and-forward communications system designed for use by computers and computer terminals. This Quarterly Technical Report briefly describes various aspects of network operation and maintenance, including IMP software modifications to permit more than 63 IMPs on the net and more than 4 Host computers on an IMP, and shipment of the first Private Line Interface to the field; and discusses in some detail the new TIP software to be released...
Topics: DTIC Archive, Heart, Frank, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *MESSAGE PROCESSING,...
This report describes BBN efforts in the design of the National Software Works system and BBN efforts to integrate TENEX into the National Software Works System. It also describes BBN efforts to upgrade existing ARPANET message service to meet Navy requirements for an interactive message processing test at CINCPAC.
Topics: DTIC Archive, Burchfiel, J, Thomas, R, Myer, T, Tomlinson, R, BOLT BERANEK AND NEWMAN INC CAMBRIDGE...
This report describes the function and operation of the National Software Works (NSW) system component known as the tool Foreman. A tool is a software development computer program made available to users through the multi- computer NSW system. The Foreman provides tools with their NSW execution environment, and ensures the smooth operation of tools within the NSW. Various aspects of the tool environment and the Foreman interface with other NSW system processes are described.
Topics: DTIC Archive, Schantz, Richard E, Millstein, Robert E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA,...
This report describes BBN efforts in the continuing development of the HERMES message-processing system, with respect to system design, security requirements and preparations for the DARPA/NAVY/CINCPAC interactive test.
Topics: DTIC Archive, Burchfiel, J, Myer, T, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS...
This report describes the function and operation of the National Software Works (NSW) system component known as the tool Foreman. A tool is a software development computer program made available to users through the multi- computer NSW system. The Foreman provides tools with their NSW execution environment, and ensures the smooth operation of tools within the NSW. Various aspects of the tool environment and the Foreman interface with other NSW system prosesses are described.
Topics: DTIC Archive, Schantz, Richard E, Millstein, Robert E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA,...
This report describes the implmentation of MSG, the interprocess communication facility for the National Software Works (NSW) system, for the (TENEX) system. It is intended as a reference for programmers who use MSG and as a guide for those responsible for the operation of systems, such as NSW, which uses MSG.
Topics: DTIC Archive, Thomas, Robert H, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMPUTER COMMUNICATIONS,...
Two DEC PDP-11 systems are to be installed at the Fleet Numerical Weather Center (FNWC) to interface FNWC CDC6500 Computers to the ARPANET. One system is to be used to interface two CDC6500 computers that operate in a secure mode to the ACCAT subnet of the ARPANET. The second system is to be used to interface a third CDC6500 that operates in an unclassified mode to the non- secure ARPANET. This report details information required to prepare the FNWC facilities for the installation of the PDP-11...
Topics: DTIC Archive, DePesa, R, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMAND AND CONTROL SYSTEMS,...
This report describes BBN efforts in the continuing development of the HERMES message-processing system, with respect to system design, security requirements and preparations for the DARPA/NAVY/CINCPAC interactive test.
Topics: DTIC Archive, Burchfiel, J, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMPUTERS, *DATA PROCESSING...
This report describes BBN efforts in the continuing development of the HERMES message-processing system, with respect to system design, security requirements and preparations for the DARPA/NAVY/CINCPAC interactive test.
Topics: DTIC Archive, Burchfiel, J, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
This quarterly Technical report covers work performed during the period noted on the development of a high-speed interface, called a voice funnel, between digitized speech streams and a packet-switching communications network.
Topics: DTIC Archive, Rettberg, R, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *MULTIPROCESSORS, *SPEECH...
This quarterly Technical report covers work performed during the period noted on the development of a high-speed interface, called a Voice Funnel, between digitized speech streams and a packet-switching communications network.
Topics: DTIC Archive, Hoffman, M, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
This Quarterly Technical Report covers work performed during the period noted on two projects: (1) the development of a high-speed interface, called a Voice Funnel, between digitized speech streams and a packet-switching communications network, and (2) the analysis of Pluribus performance and end-to- end flow control in the wideband satellite network.
Topics: DTIC Archive, Hoffman, M, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
This Quarterly Technical Report describes work on the development of and experimentation with packet broadcast by satellite; on development of Pluribus Satellite IMPs; on a study of the technology of Remote Site Maintenance; on the development of Inter-network monitoring; on shipboard satellite communications; and on the development of Transmission control protocols for the HP3000, TAC, and VAX-UNIX. (Author)
Topics: DTIC Archive, Bressler,R D, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
This Quarterly Technical Report describes work on the development of and experimentation with packet broadcast by satellite; on development of Pluribus Satellite IMPs; on a study of the technology of Remote Site Maintenance; on the development of Inter-network monitoring; on shipboard satellite communications; and on the development of Transmission control protocols for the HP3000, TAC, and VAX-UNIX. (Author)
Topics: DTIC Archive, Bressler,R D, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
This Quarterly Technical Report describes work on the development of and experimentation with packet broadcast by satellite; on development of Pluribus Satellite IMPs; on a study of the technology of Remote Site Maintenance; on the development of Inter-network monitoring; on shipboard satellite communications; and on the development of Transmission control protocols for the HP3000, TAC, and VAX-UNIX. (Author)
Topics: DTIC Archive, Bressler,R D, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
This Quarterly Technical Report describes work on the development of and experimentation with packet broadcast by satellite; on development of Pluribus Satellite IMPs; on a study of the technology of Remote Site Maintenance; on the development of Inter-network monitoring; on shipboard satellite communications; and on the development of Transmission control protocols for the HP3000, TAC, and VAX-UNIX. (Author)
Topics: DTIC Archive, Bressler,R D, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
This Quarterly Technical Report describes work on the development of and experimentation with packet broadcast by satellite; on development of Pluribus Satellite IMPs; on a study of the technology of Remote Site Maintenance; on the development of Inter-network monitoring; on shipboard satellite communications; and on the development of Transmission control protocols for the HP3000, TAC, and VAX-UNIX. (Author)
Topics: DTIC Archive, Bressler,R D, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
This Quarterly Technical Report describes work on the development of and experimentation with packet broadcast by satellite; on development of Pluribus Satellite IMPs; on a study of the technology of Remote Site Maintenance; on the development of Inter-network monitoring; on shipboard satellite communications; and on the development of Transmission control protocols for the HP3000, TAC, and VAX-UNIX. (Author)
Topics: DTIC Archive, Bressler,R D, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
This Quarterly Technical Report describes work on the development of and experimentation with packet broadcast by satellite; on development of Pluribus Satellite IMPs; on a study of the technology of Remote Site Maintenance; on the development of Inter-network monitoring; on shipboard satellite communications; and on the development of Transmission control protocols for the HP3000, TAC, and VAX-UNIX. (Author)
Topics: DTIC Archive, Bressler,R D, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
This Quarterly Technical Report describes work on the development of and experimentation with packet broadcast by satellite; on development of Pluribus Satellite IMPs; on a study of the technology of Remote Site Maintenance; on the development of Inter-network monitoring; on shipboard satellite communications; and on the development of Transmission control protocols for the HP3000, TAC, and VAX-UNIX. (Author)
Topics: DTIC Archive, Bressler,R D, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
This Quarterly Technical Report describes work on the development of and experimentation with packet broadcast by satellite; on development of Pluribus Satellite IMPs; on a study of the technology of Remote Site Maintenance; on the development of Inter-network monitoring; on shipboard satellite communications; and on the development of Transmission control protocols for the HP3000, TAC, and VAX-UNIX. (Author)
Topics: DTIC Archive, Bressler,R D, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *COMMUNICATIONS NETWORKS,...
