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ITU-T Study Group 17 (Study Period 2005-2008)
Security, languages and telecommunication software

Short History of Study Group 17

The following is a short history of Study Group 17 and the related X-series and Z-series of Recommendations. As many of you know SG 17 was formed by the merger of Study Groups 7 and 10 in 2001.

Study Group 7 had its roots back to the Joint Working Party on New Data Networks, which was created by the IVth Plenary Assembly of the CCITT in 1968. Table 1 below shows the evolution over the various study periods and the study group leadership until the merger with SG 10 in 2001. The work program evolved significantly over this time. In the late 60s and early 70s, the work focused on digital leased lines and digital circuit switched data networks with the first X-series Recommendations approved at the December 1972 Vth CCITT Plenary Assembly. Packet switched networks was the hot topic of the 70s and 80s with the first edition of the famous X.25 Recommendation approved in 1976. An ever increasing number of packet data network Recommendations were developed and approved in 1980, 1984 and 1988. Work on Open Systems Interconnection (OSI) in conjunction with ISO and IEC began in the early 80s and was very intense through the 80s and 90s. By 2000, this work had reached maturity and SG VII began to build its efforts on security.

Study Group 10 had its roots as part of the work of CCITT Study Group XI with three Questions on languages for stored program control telephone exchanges adopted by the Vth CCITT Plenary Assembly in 1972. Table 2 below shows the evolution over the various study periods and the study group leadership until the merger with SG 7. In 1976, skeleton Recommendations on Specification and Description Language (SDL) and Man-Machine Language (MML) were adopted as the first Z-series Recommendations. These were further developed in the next 8 years along with CHILL with approvals in 1980 and 1984. The VIIIth CCITT Plenary Assembly in October 1984 established Study Group 10. By 2000, a suite of Z-series Recommendations was in place with MSC (Message Sequence Chart) as the major addition in the 1990s. Focus in the later years moved to aligning ITU-T languages, such as SDL and MSC, to OMG’s UML (Unified Modeling Language).

In 2001, TSAG agreed to merge Study Groups 7 and 10 to form Study Group 17 (7 + 10 = 17). The chairman of the two study groups became co-chairmen of the new Study Group 17 and all the vice chairmen of the two study groups became vice chairman of the new Study Group 17. Table 3 below shows the evolution of Study Group 17 over the two study periods and the study group leadership. A major change was made at WTSA-04 when the remaining data network work was transferred to Study Group 13 and the major focus of Study Group 17 was shifted to security while also continuing its work on languages. By WTSA-08, a substantial set of security Recommendations had been approved.

Table 4 shows the history of X and Z series Recommendations approved by the various CCITT Plenary Assemblies. After 1988, Recommendations were developed, approved and published individually, rather than in the sequence of color books published every four years. The X-series expanded in scope over the years from New data networks to Data communication networks to Data networks and open system communications to Security, data networks and open system communications. In a similar manner, the Z-series expanded over the years from Programming languages for SPC exchanges to Programming languages, to Languages and general software aspects for telecommunication systems. Tables 5, 6, 7 and 8 show the current set of 325 Recommendations and Supplements under the responsibility of Study Group 17 (as of 15 September 2008).


Table 1 - Leadership of Study Group 7 and predecessors


Study Period Designation Name Chairman Vice Chairmen Number of Questions
1969-1972 JWP/NRD New data networks O. A. Ohlmer (Germany) V. C. MacDonald 1
1973-1976 Study Group VII New networks for data transmission V. C. MacDonald (Canada) N. R. Crane (Australia)
H. Gabler (Germany)
A. E. Serrure (Belgium)
1 (25 points)
1977-1980 Study Group VII New networks for data transmission V. C. MacDonald (Canada) J. Chapman (UK)

N. R. Crane (Australia)
M. Kato (Japan)
A. Texier (France)
34
1981-1984 Study Group VII Data communication networks V. C. MacDonald (Canada) H. V. Bertine (USA)
M. Kato (Japan)
L. Lavandera Sanchez (Spain)
A. Texier (France)
J. O. Wedlake (UK)
41
1985-1988 Study Group VII Data communication networks J. O. Wedlake (UK) H. V. Bertine (USA)
P. G. Bowie (Canada)
P. Guinaudeau (France)
L. Lavandera Sanchez (Spain)
R. Parodi (Italy)
S. Tomita (Japan)
48
1989-1992 Study Group VII Data communications networks J. O. Wedlake (UK) H. V. Bertine (USA)
P. G. Bowie (Canada)
L. Lavandera Sanchez (Spain)
J. Park (Australia)
R. Parodi (Italy)
P. Puges (France)
S. Tomita (Japan)
15
1993-1996 Study Group 7 Data networks and open systems communications H. V. Bertine (USA) V. Ossipov (Russia)
S. Tomita (Japan)
C. H. Yim (Korea)
25
1997-2000 Study Group 7 Data networks and open system communications H. V. Bertine (USA) Y. H. Lee (Korea)
Y. Hiramatsu (Japan)
V. Ossipov (Russia)
25
2001-16/9/01 Study Group 7 Data networks and open systems communications H. V. Bertine (USA) B.-M. Chin (Korea)
V. Ossipov (Russia)
14

Table 2 - Leadership of Study Group 10 and predecessors


Study Period Designation Name Chairman Vice Chairmen Number of Questions
1973-1976 Study Group XI Telephone switching and signalling J. S. Ryan (USA) T. Moussa (Cameroon)
P. Plehiers (Belgium)
P. Sterndorff (Denmark)
3 out of 11
1977-1980 Study Group XI Telephone switching and signalling J. S. Ryan (USA) C. A. Adeoye (Nigeria)
P. Plehiers (Belgium)
P. Sterndorff (Denmark)
3 out of 13
1981-1984 Study Group XI Telephone switching and signalling J. S. Ryan (USA) P. Collet (France)
S. Kano (Japan)
P. Plehiers (Belgium)
P. Sterndorff (Denmark)
3 out of 19
1985-1988 Study Group X Languages and methods for telecommunications applications C. Carrelli (Italy) K. Katzeff (Sweden)
N. A. Martellotto (USA)
K. Schulz (Germany)
9
1989-1992 Study Group X Languages for telecommunication applications C. Carrelli (Italy) O. F. Faergemand (Denmark)
B. Lindberg (S)
K. Schulz (Germany)
12
1993-1996 Study Group 10 Languages for telecommunication applications O. F. Faergemand (Denmark) K. Schulz (Germany) 10
1997-2000 Study Group 10 Languages and general software aspects for telecommunication systems A. Sarma (Germany) A. Meisingset (Norway) 13
2001-16/9/2001 Study Group 10 Languages and general software aspects for telecommunication systems A. Sarma (Germany) V. Efimouchkine (Russia)
A. Meisingset (Norway)
O. Monkewich (Canada)
13

Table 3 - Leadership of Study Group 17


Study Period Designation Name Chairman Vice Chairmen Number of Questions
17/9/2001-2004 Study Group 17 Data networks and telecommunication software Co-chairmen:
Herbert Bertine (USA)
and
Amardeo Sarma (Germany)
Byoung-Moon Chin (Korea)
Vladimir Efimouchkine (Russia)
Arve Meisingset (Norway)
Ostap Monkewich (Canada)
V. Ossipov (Russia)
27
2005-2008 Study Group 17 Security, languages and telecommunication software Herbert Bertine (USA) Jianyong Chen (China)
Byoung-Moon Chin (Korea)
Arkadiy Kremer (Russia)
Arve Meisingset (Norway)
Ostap Monkewich (Canada)
Yu Watanabe (Japan)
15

Table 4 - CCITT Plenary Assemblies and Recommendations Approved


Study Period Book Plenary Assembly Dates X-series Recommendations Z-series Recommendations
1969-1972 Green Book Vth CCITT Plenary Assembly 4-15 December 1972 11 (Public data networks - X.1, X.2, X.20, X.21, X.30, X.31, X.32, X.33, X.40, X.50, X.70)  
1973-1976 Orange Book VIth CCITT Plenary Assembly 27 September – 8 October 1976 24 (Public data networks) 3 (SDL – Z.100-series)
8 (MML – Z.300-series)
1977-1980 Yellow Book VIIth CCITT Plenary Assembly 10-21 November 1980 39 (Public data networks) 4 (SDL – Z.100-series)
1 (CHILL – Z.200)
9 (MML – Z.300-series)
1981-1984 Red Book VIIIth CCITT Plenary Assembly 8-19 October 1984 56 (Public data networks)
9 (OSI – X.200-series)
8 (MHS – X.400-series))
5 (SDL – Z.100-series)
1 (CHILL – Z.200)
15 (MML – Z.300-series)
1985-1988 Blue Book IXth CCITT Plenary Assembly 14-25 November 1988 72 (Public data networks)
23 (OSI – X.200-series)
9 (MHS – X.400-series))
8 (Directory – X.500-series))
1 (SDL – Z.100)
1 (FDTs – Z.110)
1 (CHILL – Z.200)
19 (MML – Z.300-series)

Table 5 - E-series Recommendations under the responsibility of Study Group 17*


OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS

 
Subject Recommendation Series Number of Texts
International operation E.100-E.229 2
General provisions concerning Administrations E.104-E.119 2
Network management E.400-E.489 1
International network management E.405-E.419 1
* As of 15 September 2008. The 3 Recommendations are in conjunction with Study Group 2

Table 6 - F-series Recommendations under the responsibility of Study Group 17*

NON-TELEPHONE TELECOMMUNICATIONS SERVICES


Subject Recommendation Series Number of Texts
Message Handling Services F.400-F.499 13
Directory Services F.500-F.549 3
* As of 15 September 2008

Table 7 - X-series Recommendations under the responsibility of Study Group 17*

DATA NETWORKS, OPEN SYSTEM COMMUNICATIONS AND SECURITY


Subject Recommendation Series Number of Texts
Open Systems Interconnection X.200-X.299 77
Model and notation X.200-X.209 2
Service definitions X.210-X.219 18
Connection-mode protocol specifications X.220-X.229 20
Connectionless-mode protocol specifications X.230-X.239 11
PICS proformas X.240-X.259 9
Protocol Identification X.260-X.269 3
Security Protocols X.270-X.279 2
Layer Managed Objects X.280-X.289 5
Conformance testing X.290-X.299 7
Message Handling Systems X.400-X.499 25
Directory X.500-X.599 16
OSI networking and system aspects X.600-X.699 71
Networking X.600-X.629 16
Efficiency X.630-X.639 8
Quality of service X.640-X.649 2
Naming, Addressing and Registration X.650-X.679 10
Abstract Syntax Notation One (ASN.1) X.680-X.699 35
Security X.800-X.849 21
OSI applications X.850-X.899 18
Commitment, Concurrency and Recovery X.850-X.859 3
Transaction processing X.860-X.879 4
Remote operations X.880-X.889 8
Generic applications of ASN.1 X.890-X.899 3
Open distributed processing X.900-X.999 15
Telecommunication security X.1000-X.1999 34
* As of 15 September 2008

Table 8 - Z-series Recommendations under the responsibility of Study Group 17*

LANGUAGES AND GENERAL SOFTWARE ASPECTS FOR TELECOMMUNICATION SYSTEMS


Subject Recommendation Series Number of Texts
Formal description techniques (FDT) Z.100-Z.199 23
Specification and Description Language (SDL) Z.100-Z.109 8
Application of formal description techniques Z.110-Z.119 2
Message Sequence Chart (MSC) Z.120-Z.129 3
Extended Object Definition Language (eODL) Z.130-Z.139 0
User Requirements Notation (URN) Z.150-Z.159 1
Testing and Test Control Notation (TTCN) Z.160-Z.179 9
Programming languages Z.200-Z.299 1
CHILL: The ITU-T high level language Z.200-Z.209 1
Quality Z.400-Z.499 2
Quality of telecommunication software Z.400-Z.409 1
Quality aspects of protocol-related Recommendations Z.450-Z.459 1
Methods Z.500-Z.599 1
Methods for validation and testing Z.500-Z.519 1
Middleware Z.600-Z.699 2
Processing environment architectures Z.600-Z.609 2
* As of 15 September 2008


 

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