Teleprocessing Systems Research Articles

Restructuring of COBOL/CICS legacy systems

We provide a strategy to restructure transaction processing systems. Such systems are core assets of most modern business operations, so their enhancement is crucial. Before large-scale renovation of transaction processing systems can take place, they need to be restructured. We argue that teleprocessing systems are unstructured by their nature. In this paper we approach the problems from a technical viewpoint and we report on the methods and tools that are necessary to bring structure in transaction systems.

Book Review: Data Communication and Teleprocessing Systems, 2nd Ed.

Book Review: Data Communication and Teleprocessing Systems, 2nd Ed.

Book review: Data Communications and Teleprocessing Systems

Book review: Data Communications and Teleprocessing Systems

Traffic Measurements in Data Networks, Recent Measurement Results, and Some Implications

Traffic statistics are a necessary base for network modeling, performance analysis, and network traffic control. This paper deals with results of recent traffic measurements in teleprocessing systems and their implications. In the introductory sections the range of traffic measurement problems in present networks and publications in the field of measurement results are surveyed. The main parts focus on measurement objects, results, and implications of recent user traffic measurements in four conversational teleprocessing systems, mostly with medium-speed terminals like cathode ray tube (CRT) display terminals. The first two moments, distributions, and regressions of random variables characterizing the structure of dialog cycles are presented. Some important properties are extreme traffic burstiness, frequently high coefficients of variation, and different characteristics of CRT terminals compared with teletypewriters. It is observed that new measurement tasks are arising and improved measurement systems are needed.

The Virtual Machine (VM) as a System Control Program for OS/VS1 and Adaptation of Conversational Monitor System (CMS) in The Average Computer Centre

In this paper the authors have tried to answer a few questions which followed the exploitation of the VM/370 system with CMS's and consequences of it in the Computer Centre of Polish Ministry of Machine Industry /CО МРМ/. In one of the chapters is described in short form CO MPM computer installation onto which the VM/370 system and operating system Os/VS executes. In a separate chapter are described a few CMS features which are very good programer tool as well for application programmers as for system ones. This paper has given too a general description of terminal network /above 100 terminals/ and of some teleprocessing systems run in mentioned above Computer Centre. In conclusion on the base of CO MPM experiences it has shown the advantages and disadvantages of the VM/370 system with CMS's work, which affected the implementation of these systems in the IBM 370/145 computer.

Some cryptographic techniques for machine-to-machine data communications

Some of the threats to the integrity of multiuser teleprocessing systems and to the data they contain can be countered by the use of cryptography. Stream-generator ciphers are not ideally suited for such an application, thus the use of block ciphers, which have the beneficial property of a strong nonlinear intersymbol dependence, is suggested. This property provides the means for automatic error detection for verifying the authenticity of terminal operators, and for ensuring messase integrity. An experimental demonstration system has been constructed to illustrate protection features that can be provided for real applications.

A Teleprocessing Interface Macro System (TIMS)

A macro system for PL/1-programming is described. It facilitates the coding of application programs for teleprocessing (TP) systems and standardizes these programs. Options may be included as the programmer desires. The macro system allows usage of the same program from multiple terminals. Standardized access and handling procedures facilitate the usage of the various application programs within the information system. The design criteria of the macros allow an adaptation to other TP systems in order to avoid »locking in« of application programs into one TP system and provide means for program exchange.

An Analysis of Buffering Techniques in Teleprocessing Systems

Core buffers are used in teleprocessing systems for handling queueing and transfer of messages between all communication lines and queueing media. Management of data buffers for incoming and outgoing messages is an important task in running a real-time system at optimal efficiency. There are several factors that a system designer must consider in weighing the tradeoff of time and main storage. This paper deals with the analysis of several practical buffering techniques and provides procedures for determining the buffer size, which satisfies a prespecified probability of overflow.

Communication software

A tutorial introduction to the function and construction of communications software in modern teleprocessing systems is presented, Communication functions include network control, message preprocessing and queuing, and error recovery. These functions are provided by the communication subsystem, which includes components of the supervisory system, special-purpose software, and cooperating peripheral processors. The construction of communication subsystems is described, including aspects of both software and hardware, in the context of a multiprogramming and multiprocessing environment. The application of distributed-function processing, virtual memory, and segmentation techniques to the design of these subsystems is discussed.

Data communication requirements Of computer systems

Teleprocessing systems are mushrooming throughout public and private industry: computer-to-computer links form an integral part of our national defense system and air traffic control; manned terminal-to-computer systems establish reservations on airlines and at motels; hybrid systems keep our tax returns honest. But these computer centers, remote terminals, and displays are often a part, and require lines of direct communication A large number of inexpensive, switchable data channels are needed, with a speed resolution of 10 to 20 characters per second, for connecting human-operated terminals to a multiplex of special-purpose computers. Machine-to-machine communication requires channels with high-speed data resolution that are several orders of magnitude faster, with virtually error-free performance.

On teleprocessing system design, Part VI: The role of digital simulation

This paper attempts to point out the role that simulation plays in the design of computer systems, emphasizing that this technique should be used, not as a sporadic tool to obtain unrelated answers, but as an experimental method and a continuing integral part of the design process. Although simulation is especially pertinent to the design of teleprocessing systems, it should be emphasized that simulation methods can also be useful in the design of the broad spectrum of computer systems including time-sharing and multiprocessing systems.