NDLI: Encoding CCITT X.409 presentation transfer syntax

Content Provider	ACM Digital Library
Author	Pope, Arthur R.
Abstract	CCITT Draft Recommendation X.409 [1] defines a manner of encoding information for communication among computer systems. This scheme includes not only an encoding syntax--rules by which communicated bits and octets are assigned meaning--but also a language for describing the form and content of communicated information in a human-readable notation. In this notation one may define the form of a protocol data unit (PDU), specifying how the PDU is composed of individual fields of integer values, bit flags, characters, etc. One may also use the notation to define specific instances of PDUs: a PDU containing the integer value 3, the bit flag "on" and the character "A", for example. From the notational description of the PDU one may directly infer its encoded representation by applying the rules of the encoding syntax. As a language for documenting the encoding of standard protocols, the notation is intended primarily for human consumption. Being a formal language, however, it is also well suited to automated processing. This paper describes some software tools developed at BBN for processing the notation. The principle purpose of the tools is to permit rapid construction of PDU encoding and decoding software from notational descriptions of PDUs. The next section of this paper contains a brief overview of the X.409 notation and syntax for those not already familiar with the Draft Recommendation. The following section describes the tools and their method of operation. Some notes about the implementation and its performance complete the paper.
Starting Page	4
Ending Page	10
Page Count	7
File Format	PDF
ISSN	01464833
DOI	10.1145/1024908.1024909
Journal	ACM SIGCOMM Computer Communication Review (CCRV)
Volume Number	14
Issue Number	4
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1993-07-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Software

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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