1、 CENELEC EN*b0870-b- bol 95 3404583 0358872 bT5 Telecontrol equipment and systems Part 6. Telecontrol protocols compatible with IS0 standards and ITU-T recommendations Section 601. Functional profile for providing the connection-oriented transport service in end system connected via permanent access
2、 to a packet switched data network The European Standard EN 60870-6-601 : 1995 has the status of a British Standard BS EN 1995 1994 60870-6-601 : LEC 870-6-601 : BS EN 60870-6-601 : 1995 Amd. No. This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, wa
3、s published under the authority of the Standards Board and comes into effect on 15 September 1995 O BSI 1995 Date Text affected The following BSI references relate to the work on this Standard: Committee reference PEU57 Draft for comment 9W205001 DC ISBN O 580 24833 7 Committees responsible for this
4、 British Standard The preparation of this British Standard was entrusted to Technical Committee PEL57, Power system control and associated communications, upon which the following bodies were represented Association of Consulting Engineers BEAMA Ltd. BEAMA Metering Association MA) EEA (Association o
5、f Electronics, Telecommunications and Business Equipment Electricity Association GAMBICA (BEAMA Ltd.) Ti-ansmission and Distribution Association (BEAMA Ltd.) Industries) CENELEC ENab0870-6- bol 95 H 3404583 OL58894 478 BS EN 60870-6-601 : 1995 Contents Page Committees responsible Inside front cover
6、National foreword Il Foreword 2 Text of EN 6087-6-601 3 i CENELEC ENJb0870-6- bol 95 3404583 0158875 304 BS EN 60870-6-601 : 1995 National foreword This British Standard has been prepared by Technical Committee PEU57 and is the English language version of EN 6087-6-6l: 1995 Telecontrol equipnaent sy
7、stems Part 6. Telecontrol ptocols compatible with IS0 standmds and ITU-T recom - digital Permanent Access to a PSDN (TB1 121). NOTE - Corresponding to the transport profiles TB1 11l/TB1121, three parts of the ISP 10609 are directly applicable: ISOIIEC ISP 10609-1, ISOAEC ISP 10609-5 and ISOAEC ISP 1
8、0609-9. CENELEC ENrb0870-6- 601 95 3404583 OL58904 147 m Page 9 EN 60870-6-601 : 1995 6 Conformance requirements To be conformant to this FP an implementation of an End System accessing permanently to a PSDN shall: - conform to the requirements of profile TB1111TTB1121 defined in ISOAEC ISP - satisf
9、y the complementary requirements expressed in the following sub-clauses for layers 1 to 4. 1 0609-5; The choices and parameter values to be negotiated in the establishment of each transport connection (see 6.1) or network connection (see 6.2) are described. Implementation choices in data link layer
10、(see 6.3) and specifications of physical interfaces (see 6.4) are also described. 6.1 Transport 1 ayer This subclause describes the choices and parameter values to be negotiated in the establishment of each transport connection. Certain of those choices and parameter values must be made visible to t
11、he Transport Service user. They are: - negotiated priority level: - negotiated protocol class; the visibility of this parameter to the user of Transport Service is not mandatory in this profile, but only optional. The Transport Service provided is as described in IS0 8072. The transport protocol pro
12、cedures shall be as described in IS0 8073. The End System shall meet the requirements of the transportslayer for group TB as defined in ISOIIEC ISP 10609-1 and the complementary requirements listed below. These additional requirements may possibly modify some clauses of ISO/IEC tSP 10609. 6.1.1 Prot
13、ocol classes As described in ISO/IEC ISP 10609-1, clause 1 and subclause 5.2, the transport protocol classes to be implemented in End Systems are O, 2 and 4. 6.1.2 Negotiation of protocol classes a) If the End System is initiator of the Transport Connection (TC), then: - if the TC is established on
14、a Network Connection (NC) on which no other TC existed before, then the “preferred class“ shall be the class 4 and the “alternative class“ shalt be class number O; - if the TC is established on a NC on which previously another TC existed, then the “preferred class“ shall be class 4 and, as specified
15、 in IS0 8073, the “alternative class“ shall be class 2. b) If the End System responds to a TC request, then the chosen class shall be the more performant one) among the valid classes in the IS0 8073 sense (see clause 6.5.4 and table 3 of IS0 8073). ) Class 4 is mare performant than class 2 and class
16、 2 is more performant than class O. Page 10 EN 60870-6-601 : 1995 6.1.3 Checksum The use or non-use of the checksum as negotiated in TPDUs CR (Connection request) and CC (Connection Confirm) shall be configurable in the Reference End System. In this standard, the use of the checksum is recommended.
17、6.1.4 Splitting The non-use of splitting shall be possible. 6.1.5 Priority management The priority is one of the Quality Of Service (QOS) parameters, defined in IS0 8072, paragraph 10.1 O. It has to be negotiated as in IS0 8073, paragraph 6.5.4. The coding of the various levels of priority shall be
18、in conformity with IS0 8073 (paragraph 13.3.4, item n) retaining only four levels, the values of which are: - low priority: 14 (O000 O000 O000 1 1 1 O), - average priority: 10 (O000 O000 O000 lolo), - very high priority: O (O000 O000 O000 0000). - high priority: 5 (O000 O000 O000 OlOl), On reception
19、, a value over 1 O must be interpreted as a low priority; a value from 6 to 1 O as an average priority; and a value from 1 to 5 as a high priority. The case where the priority parameter has not been transmitted is interpreted as a priority implicitly agreed on and locally pre-configured within the c
20、ommunications systems, or, lacking a preconfiguration, as a low priority. Some modifications of ISOIIEC ISP 10609-1 are imposed by this use of priority parameter: - in table A.2.3.3, column “status“ of the “Profile Features“ table: 0 index 12 CR 15: the status of the Priority parameter becomes “m“;
21、index 12 CC 14: the status of the Priority parameter becomes “m“; - in table A.2.3.4, column “status“ of the “Profile Features“ table: index 14 CR 15: the status of the Priority parameter becomes “m“; index 14 CC 14: the status of the Priority parameter becomes “m“. 6.2 Network Layer The OS1 Network
22、 Service shall be provided as described in IS0 8878 (excluding annex A). The protocol used is X.25 as described in IS0 8208 for End Systems. The End System shall meet the requirements of the Network Layer as defined in ISO/IEC ISP 10609-9. clauses 5 and A.2 and the complementary requirements listed
23、below. CENELEC ENmb0870-6- 603 95 3404583 0358906 TIT Page 11 EN 60870-6-601 : 1995 6.2.1 Addressing scheme This FP adds no restriction on the addressing scheme. Every addressing scheme which conforms to IS0 8348 shall be supported. The principles of Network layer addressing, the semantics, abstract
24、 syntax and preferred encodings for NSAP address are defined in IS0 8348. The DSP part of the NSAP address (see IS0 8348) shall be coded according to the binary abstract syntax. The calling, called and responding NSAP addresses need to be conveyed by the X.25 call set-up and clear packets as require
25、d by the OS1 Network Service definition. Encoding of the NSAP addresses in the address and address extension fields is as specified in IS0 8878. 6.2.2 Priority management The Priority is one of the Quality Of Service parameters. The Network Service shall offer the visibility of the sub-parameter “pr
26、iority of the data“ in the priority parameter, in conformity with IS0 8348. The negotiation of this parameter shall be done in conformity with 12.2.7 of IS0 8348. The target value is the specified one coming from the Transport Layer. The lowest quality acceptable value is: “unspecified“. It shall be
27、 interpreted as a priority implicitly agreed on and locally pre-configured within the communications systems, or, lacking a preconfiguration, as a low priority. The mapping of the priority parameter defined in IS0 8348 into X.25 corresponding fields shall be done in conformity with IS0 8878/Add. 1.
28、The four levels of priority are coded as specified in 15.3.2.5 of IS0 8208. - low priority: o (O000 O000 O000 OOOO), - average priority: 5 (O000 O000 O000 OlOl), - high priority: 10 (O000 O000 O000 lOlO), - very high priority: 14 (O000 O000 O000 11 10). On reception. a value lower or equal to 4 must
29、 be interpreted as a low priority; a value from 5 to 9 as an average priority; and a value from 10 to 13 as a high priority. Some modifications of ISOIIEC SP 10609-9 are imposed by this use of priority parameter (see A.2.1 of ISO/IEC ISP 10609-9). CENELEC EN*b0870-5- 601 95 m 3404583 0158907 956 Ed8
30、 Page 12 EN 60870-6-601 : 1995 What environment is supported? DTEIDCE (1 988) I Base standard features I I Profile features I Protocol I Reference I Status 0.2 status ISP reference 6.3 Data Link Layer The protocol is LAPB, as defined in IS0 7776. Extended frame sequence numbering is not in the scope
31、 of this FP and therefore not supported. The End System shall follow the specifications of the Data Link Layer as defined in clauses 6 and A.3 of ISOAEC ISP 10609-9. 6.4 Physical Layer The End System shall meet the requirements of the Physical Layer as defined in clauses 7 and A.4 of ISOAEC ISP 1060
32、9-9. Page 13 EN 60870-6-601 : 1995 Annex A (informative) Bibliography iSO/iEC TR 10000-1 : 1992, Information technology - framework and taxonomy of Interna- tional Standardized Profiles - Part l: Framework ISO/IEC TR 10000-2: 1992, Information technology - Framework and taxonomy of Interna- tional S
33、tandardized Profiles - Parl2: Taxonomy of Profiles CENELEC EN*b0870-6- 603 95 3404583 0358909 729 BS EN 60870-6-601 : 1995 List of references See national foreword. CENELEC ENxb0870-b- bOL 95 9 3404583 0358930 440 9 BS EN 60870-6-601 : 1995 IEC 870-6-601 : 1994 BSI 389 Chiswick High Road London w4 4
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