1、 TlA07-01 E Page 1 (Old reference T/CD 07-01 E) Recommendation T/A 07-01 (Odense 1986) HARMONIZATION OF TELETEX TERMINAL EQUIPMENT Proposed by the Working Group T/WG 10 “Terminal equipment and data networks” (TD) Text of the Recommendation adopted by the “Telecommiirtications” Commission “The Confer
2、ence of European Post and Telecommunications Administrations, consider itig - the work undertaken within CEPT with the view to harmonizing international telecommunication services as well - that TELETEX services are implemented or will be implemented in the future, - that CCITT Recommendations T.60,
3、 T.61, T.62 and T.70 describe the technical requirements for terminal - that CEPT Working Group TD has studied the harmonization of TELETEX terminal equipment under study as equipment, equipment, point TD 1, recommends - to the member administrations of the CEPT, which intend to introduce the TELETE
4、X service, to apply the specification contained as follows.” Edition of December 31, 1987 1. 2. 3. 4. 5. 6. 7. 8. TIA 07-01 E Page 3 Contents Page GENERAL . 5 BASIC TELETEX SERVICE . 6 TELETEX APPLICATION FUNCTIONS . 7 TELEX-TELETEX INTERWORKING . 26 PS TN 30 PSPDN . 32 NETWORK ACCESS VIA CSPDN 33 O
5、THER ITEMS . 37 ANNEX 1 (Dl II m OVL) Keyboard Layout IV (SF, S) v (UK) VI W) (Dl VIII (CH) mo X Control Document Specification XI (1) Interworking with Telex (F.201) XII (DK, N) Requirements and advisory notes regarding F.201 XIII (UK) Network access via CSPDN XIV Formal Description to HDLC used in
6、 CSPDN xv Network Layer Description on CSPDN XVI (SF) Service signals of the Finnish public data network (X.21) XVII (UK) PSTN call set-up timers XVm (I) Interface between Data Terminal Equipment (DTE) and Data Circuit Terminating Equipment (DCE) for synchronous operation on the Italian PT Administr
7、ation network (CSPDN) Use of protocol for interworking with the automatic Teletex-directory system Test procedures for the Session Layer The Nordic subrepertoire PSTN Teletex terminal algorithm requirements Presentation of reason for Non-Delivery or interruption Reason for Non-Delivery (Message not
8、transmitted) Unsuccessful transmission of Teletex documents National Teletex service subrepertoire of graphic characters O O Edition of December 31, 1987 TIA 07-01 E Page 5 1. GENERAL 1.1. Scope This document describes the application specifications of the Teletex terminal equipment. The specificati
9、on is based on the Red Book versions (1984) of the relevant CCITT Recommendations and it reflects the amendments to those Recommendations agreed in CCITT and CEPT. In addition it enumer- ates the various administration-specific technical requirements, with the aim to establish a common set of CEPT t
10、echnical requirements in forthcoming issues of this Recommendation. Therefore this Recommendation is to be seen as a first step toward harmonizing Teletex terminal equipment. Other CEPT specifications dealing with Teletex terminal equipment or Teletex services are referenced in this document. The in
11、troduction of Functional Standards in this Recommendation is made as far as the definitions of these Functional Standards were available. Note. Throughout this Recommendation the term “Administration” should be taken to read as either “Administration” or “Recognized Private Operating Agency”. .2. In
12、troduction -2.1. This Recommendation defines the minimum requirements for terminal equipment participating in the European Teletex service. The Teletex terminal described here allows to produce character coded texts and to transmit their true contents and form to a receiving terminal complying the s
13、ame specifications. Teletex systems such as cluster, PABXs, etc., may need additional requirements. .2.2. 1.3. Structure of this Recommendation This Recommendation includes a number of Functional Standards, each describing a particular aspect of the Teletex service communication needs. For each Func
14、tional Standard, the following points have been considered: (a) function definition (b) scenario (c) reference to working set of standards (d) statement of conformance requirements Each particular item, where necessary, has been subdivided into : - section 1: - section 2: - section 3 : - section 4:
15、chosen classes or subsets selected options and parameters recommended ranges of parameter values interpretations of ambiguous points (a) agreed within CEPT (b) national requirements The relationship between FS Clil, FS A/221, FS T/xx is shown in the figure below. Clil1 Clil I CI112 I Al22 1 TI32 I I
16、 C/113 T/4 1 2 TI422 (PSTN) (PSPDN) (CSPDN) Edition of December 31, 1987 Figure 1. Relationship between the Functional Standards. _;_- _, CEPT T/A*07-O3*E 86 2326434 0002586 T M TIA 07-01 E Page 6 1.4. 1.5. 1.5.1. 1.5.2. 1.5.3. 1.5.4. 2. 2.1. Figure 1 (T/A 07-01) shows relationship between the assoc
17、iated Functional Standards. FS C/ll itself contains C/lll, C/l12 and C/113. Each of them contains the network-independent FS A/221 and the associated network-dependent FS T/xxx, together forming the complete Teletex environment needed for a certain implementation. National specifications In this Rec
18、ommendation the requirements of the following CEPT Administrations have been incorporated: Austria (A) Belgium (B) Denmark (DK) Finland (SF) France (F) Germany (D) Teletex terminal specification (Fed. Rep. of) Ireland (EI) No specification available yet Italy (I) Specification for Teletex terminals
19、over CSPDN Netherlands (NL) Teletex terminal specification Norway (N) Nordic Teletex Specification NT-SPEC No. T-xxx Spain (E) Teletex terminal specification Sweden (S) Technical Requirements for connection of equipment to the Teletex service in Sweden Switzerland (CH) Teletex national requirements
20、for Teletex terminal equipment United Teletex service technical guide Kingdom (UK) Preliminary note. This document currently does not include the complete requirements, and the content may not be in accordance with all the national terminal specifications mentioned above. An alignment of all these s
21、pecifications with this document is, however, aimed at by the CEPT Administrations. National Requirements for Teletex Terminal Equipment Specification for access to Belgian Teletex service Nordic Teletex Specification NT-SPEC No. T-xxx Nordic Teletex Specification NT-SPEC No. T-xxx Specification du
22、Service Tltex Relationship to other CEPT Working Groups Teletex-Teletex operation This service aspect is under the scope of CEPT Working Group SF. Telex-Teletex operation This service aspect is under the scope of CEPT Working Group SF. Network Access The network interfaces, here considered as the fi
23、rst four layers of the ISO/OSI model, are under the scope of CEPT Working Group TE. The Functional Standards, dealing with network accesses, namely T/xxx, will be mentioned as references in this Recommendation. Test procedures CEPT Recommendation T/A 07-02 deals with Teletex Conformance Testing. BAS
24、IC TELETEX SERVICE (FUNCTIONAL STANDARD C/li) Function Definition Access to the Basic Teletex Service in accordance to CCITT Recommendations F.200, T.60, T.61, T.62, T.70 and T.90. This Functional Standard is a Combined Functional Standard, which specifies the use made of a number of separate Functi
25、onal Standards from other Classifications. Edition of December 31, ir87 2.2. 2.2.1. 2.2.2. 2.3. 2.3.1. 2.3.2. 2.3.3. 2.4. 3. 3.1. 3.2. 3.2.1. End system TIA 07-01 E Page 7 End system Scenario Scetinrio Description TELETEX Terminal TELETEX Service c/i ix Model Description A/221 T/412 T/22 T/32 T/422
26、C/li1 (7112 C/113 (PSTN) (PSPDN) (CSPDN) Reference to Working Set of Standards For Operation within the PSTN Functional Standard C/il1 applies. CI111 consists of Functional Standard A/221 Teletex Application Functions (contained in chapter 3 of this document) Functional Standard T/21 PSTN - Permanen
27、t Access (referenced in chapter 5 of this document) Functional Standard T/22 PSTN - Switched Access (referenced in chapter 5 of this document) For Operation within the PSPDN Functional Standard C/112 applies. Cl112 consists of Functional Standard A/221 Teletex Application Functions (contained in cha
28、pter 3 of this document) Functional Standard T/3 1 PSPDN - Permanent Access (referenced in chapter 6 of this document) Functional Standard T/32 PSPDN - Switched Access (referenced in chapter 6 of this document) For Operation within the CSPDN Functional Standard Cl113 applies. Cl113 consists of Funct
29、ional Standard Al221 Teletex Application Functions (contained in chapter 3 of this document) Functional Standard T/412 CSPDN - Permanent Access (referenced in chapter 7 of this document) Functional Standard T/422 CSPDN - Switched Access (contained in chapter 7 of this document) Statement of Conforma
30、nce Requirements See CEPT Recommendation T/A 07-02. TELETEX APPLICATION FUNCTIONS (FUNCTIONAL STANDARD A/221) Function Definition Exchange of Teletex documents between two end systems. Edition of December 31, 1987 i CEPT T/A*07-01*E 86 H 2326434 0002588 3 TIA 07-01 E Page 8 3.2.2. 3.3. 3.4. 3.5. 3.5
31、.1. 3.5.2. Model Description CCITT T.62 The overall operation of the Teletex service is defined in CCITT Recommendation F.200. References to Working Set of Standard Layer 5 Session Layer (CCITT T.62) “Control Procedures for Teletex and Group 4 Facsimile Services” as contained in CCITT Recommendation
32、 T.62. (See also paragraph 3.5 of this Functional Standard.) Presentation Layer (CCITT T.61) “Character Repertoire and Coded Character Sets for the International Teletex Service” as contained in CCITT Recommendation T.61. (See also paragraph 3.6 of this Functional Standard.) Application Layer (CCITT
33、 T.60) “Terminal Equipment for use in the Teletex Service” as contained in CCITT Recommenda- tion T.60. (See also paragraph 3.7 of this Functional Standard.) Layer 6 Layer 7 Statement of Conformance Requirements See CEPT Recommendation TIA 07-02. Session Layer requirements based on CCITT Recommendat
34、ion T.62 Paragraphs 3.5. l., 3.5.2. and 3.5.3. contain only those amendments to CCITT Recommendation T.62, which have been agreed upon by all CEPT member countries. Chosen classes or subsets Selected options and parameters/additional reqiiirenients - Paragraph 3.4.1.21T.62 If a normal document is tr
35、ansmitted from a Teletex terminal to the Teletex-telex conversion facility this parameter shall be indicated. Note. All terminals must examine the non-basic terminal capabilities indicated in CSS or RSSP and not rely on a subsequent CDCL/RDCLP exchange to negotiate the use of any capabilities from t
36、able 3/T.62. Note. If CDCL contained also the indication of receiving capabilities of table 3/T.62, the receiving terminal shall indicate these in RDCLP as far as it supports these capabilities. - Paragraph 3.4.4.31T.62 - Paragraph 3.4.5.11T.62 - Paragraph 3.4.12lT.62 - sending terminals shall limit
37、 the content size of CDUIs to 5,000 octets or less; - although CCITT Recommendation T.62 requires for the possibilities to receive blocks of arbitrary size, the implementation of receiving-buffers is allowed, if the following requirement is met: text- blocks of at least 10,000 octets in a single CDU
38、I must be accepted, - Paragraph 4.1.31T.62 CCITT Recommendation T.62 does not specify means for determining the correctness of received protocol data units. For validation of received protocol data units see Annex I. - Paragraph 4.2.7lT.62 Add ; It is only permitted and required to evaluate the chec
39、kpoint value (Le. leading zeroes shall be ignored). O Edition of December 31, 1987 f CEPT T/A*07-OL*E 86 W 2326434 0002589 5 - 3.5.3. 3.5.4. TIA 07-01 E Page 9 - Paragraph 4.2.10/T.62 Replace the last sentence of 4.2.10 by the following note: Note. The sum of the CRN and the corresponding document r
40、eference number (DRN) shall not exceed 6 octets. In addition, it is recommended that the checkpoint reference number (CRN) length in the RDPBP and RDEP shall be less than or equal to the corresponding CRN length in CDPB (or respectively CDE). Replace the text of 5.6.6.a) by the following: (a) these
41、parameters, if present in CSS or CDCL (or the corresponding responses), shall not lead to - Paragraph 5.6.6.a)lT.62 procedural errors. - Paragraph 5.7.2.14lT.62 Add the following text to paragraph 5.7.2.14: This length restriction does not apply to CDS and CDC if an appropriate negotiation has succe
42、ssfully taken place. Recommended ranges of parameterslother recornmeitnations - Paragraph 3.2.1.21T.62 Advisory note: 3.2.1.2.d) Additional session reference number This number may be used to uniquely identify a document when operating serial session within the same minute in order that identical en
43、tries in the communication log may be avoided. (Note: Receiving terminals may not support ASR numbers.) - Paragraphs 3.2.8 aiid 3.2.91T.62 For basic Teletex terminals the receipt of CSUI and RSUI with no information field should preferably not cause a procedural error. National requirements and advi
44、sory notes - Paragraph 3.2.1.21T.62 (A) (b) Calling terminal identifier : The Calling terminal identifier shall include the extension number (max. 3 digits) of the calling terminal (as indicated in the TCR/TCA exchange at transport connection establishment) when a terminal connected to a PABX sends
45、a CSS. The three digit number shall be included in the ?Additional information field? of the terminal identification format (ref. CCITT Recommendation F.200). The procedure shall also be used between a Teletex terminal and other special central Teletex equipment (e.g. a Teletex enquiry system). Non-
46、Standardised Capability Identifier For Teletex terminals in the UK, the octets (if present) following the parameter identifier and the length indicator are assigned as follows: 1st octet: The registered CCITT Country Code as specified in Recommendation T.35. The UK T.35 code of another country may b
47、e used for those terminals that are of overseas origin. 2nd and 3rd octets: Supplier?s code, The sequence FF FF (hex) indicates that the supplier?s code is not knownlused. The sequence FF XX (where XX = any value other than FF) allows suppliers to share common facilities. Model Identification code.
48、The assignment of which will be made by individual suppliers. -Paragraph 1.1.71T.62 (A, D) - Paragraphs 3.2.1.2.j), 3.2.2.2.k), 3.4.4.7, 3.4.5.5 and 5.7.2.131T.62 (UK) Following octets: Note. The assignment of supplier?s code values will be made by the Department of Trade and Industry. Delete the se
49、cond sentence and add: Note 2. The parameters described in the paragraph 3.2.3.2 are obligatory at the transmitter side. However, on RSSN?s reception, the absence of these parameters will be ignored. - Paragraph 3.2.3.1lT.62 (F) Edition of December 31, 1987 CEPT T/A*07-QL*E b W 232b4L4 0002590 L TfAQ7-01 E Page 10 - Paragraph 3.2.3.21T.62 (B, CH, E, F, NL, UK) Note. A negative response to Command Session Start with reason parameter 00000001 is mandatory for Teletex terminals with a receive store nearly full condition. - Paragraph 3.2.9.31T.62 (UK) The receipt of an RSUI with “re
