Job transfer and manipulation

from Wikipedia, the free encyclopedia

Job Transfer and Manipulation ( JTM ) is a network protocol and network service for performing batch processing on remote computers (especially on mainframes ). In a typical case, a user specifies which programs , input and output files are to be used and which computer the programs are to be run on. The JTM service transfers the required programs and input files (which can be on different computers) to the target computer, executes the programs, monitors their progress and transfers the output files to the desired location.

The development of JTM began in the late 1970s at the International Organization for Standardization (ISO) . JTM was, alongside Virtual Terminal Service (VTS) and File Transfer and Access Management (FTAM) , one of the first three protocols of the application layer of Open Systems Interconnection (OSI) . In 1989, the JTM service and JTM protocol were published in the ISO 8831 and ISO 8832 standards . A revised and expanded version was published in 1992 together with the International Electrotechnical Commission (IEC) . JTM could never prevail, although it was more flexible in many respects than competing solutions such as remote job entry (RJE) from IBM . ISO and IEC withdrew the JTM standards in 1998.

In JTM terminology, documents are any files , for example programs , data or descriptions of jobs (e.g. in Job Control Language (JCL) ). A JTM job, called the OSI job , consists of the transfer of documents between systems, a pause during the execution of the programs and the subsequent transfer of documents that have arisen during processing (output files of the programs or status messages). An OSI job should not be confused with a conventional job (running on a single computer), but may Such jobs include . Since this job term is very general and JTM does not participate directly in program execution, the usual manufacturer-specific batch languages ​​(such as JCL) can be used and heterogeneous data processing systems can be linked. Although these basic concepts are quite simple, JTM is very powerful, but also very complex to implement .

literature

  • ISO / IEC : Information technology - Open Systems Interconnection - Job transfer and manipulation concepts and services. ISO / IEC 8831: 1992.
  • ISO / IEC: Information technology - Open Systems Interconnection - Specification of the Basic Class and Full Protocol for job transfer and manipulation. ISO / IEC 8832: 1992.
  • Andrew S. Tanenbaum : Computer Networks . Second edition. Prentice-Hall International, Inc., Englewood Cliffs, NJ 1989. ISBN 0-13-166836-6

See also

Web links