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ARQ performance in SNA networks

Published: 19 May 1980 Publication History

Abstract

In order to examine various data link control (DLC) procedures, one must first have a basic understanding of the overall network. The network depicted will be one implementing the IBM Systems Network Architecture (SNA). The fundamental communication system within SNA is referred to as the Transmission Subsystem. The Transmission Subsystem includes three types of elements. The first element, Data Link Control (DLC), transfers packets (or SNA Basic Transmission Units) across noisy transmission mediums. The protocol used here is that of SDLC (Synchronous Data Link Control). The second element, referred to as Path Control (PC), routes packets either to an end user in the node or to the proper DLC element for transmission back through the network. Path Control also blocks incoming messages and deblocks outgoing messages (i.e., SNA segmenting). Transmission Control (TC) helps manage SNA session (i.e., connection) initiation and termination, provides sequence number manipulation, controls pacing, and performs many other functions on behalf of the end user. Pacing is a means of controlling the rate at which TC sends and receives normal data flow requests.

References

[1]
Ahuja, V., "Routing and Flow Control in Systems Network Architecture," IBM Systems Journal, Vol. 18, No. 2, pp. 298--314 (1979).
[2]
Green, P. E., "An Introduction to Network Architectures and Protocols," IBM Systems Journal, Vol. 18, No. 2, pp. 202--222 (1979).
[3]
"Systems Network Architecture," General Information, IBM Publication GA27-3102-0, Mechanicsburg, Pa. (1975).
[4]
"Systems Network Architecture Reference Summary," IBM Publication GA27-3136-2, Mechanicsburg, Pa. (1978).
[5]
Gray, J. P. and McNeill, T. B., "SNA Multi-System Networking," IBM Systems Journal, Vol. 18, No. 2, pp. 279--282 (1979).
[6]
Kearsey, J. R., "Synchronous Data Link Control," Data Communications, pp. 49--60, May/June (1974).
[7]
"IBM Synchronous Data Link Control," General Information, IBM Publication GA27-3093-0, Mechanicsburg, Pa. (1974).
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"Data Communications---High Level Data Link Control Procedures---Frame Structure," International Organization for Standardization (ISO) Document No. ISO 3309, American National Standards Institute, New York (1976).
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"Data Communications---High Level Data Link Control Procedures (independent numbering)," International Organization for Standardization (ISO) Document No. ISO/DIS 4335, American National Standards Institute, New York (1976).
[10]
Carlson, D. E., "ADCCP---A Computer-Oriented Data Link Control," COMPCON, pp. 110--113, Sept. 9--11 (1975).
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Reed, M. A. and Smetanka, T. D., "How to Determine Message Response Time for Satellites," Data Communications, pp. 42--47, June (1977).
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Smetanka, T. D. and Reed, M. A., "Error Considerations in Determining Satellite Data Link Response Time," NTC 77, IEEE No. 77CH1292--2 CSCB, 3B.3.1--3B.3.5 (1977).
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Smetanka, T. D., "Coping with Data Transmission Errors," Mini-Micro Systems, pp. 74--75, July (1978).
[14]
Reed, M. A. and Smetanka, T. D., "Implications of a Selective Acknowledgment Scheme on Satellite Performance," IBM J. Res. Devel., Vol. 23, No. 2, pp. 189--196, March (1979).
[15]
Reed, M. A. and Smetanka, T. D., "A Mathematical Model of a Data Link Error Control Scheme for Response Time Distributions," ICC 79, IEEE No. 79CH1435--7 CSCB, 41.3.1--41.3.5 (1979).

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cover image ACM Other conferences
AFIPS '80: Proceedings of the May 19-22, 1980, national computer conference
May 1980
932 pages
ISBN:9781450379236
DOI:10.1145/1500518
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Association for Computing Machinery

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Published: 19 May 1980

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