CEPT T CD 05-02 E-1981 Specification of a CCITT Group 2 Document Facsimile Terminal for the Medium to High Usage Market《中到高用量市场CCITT2组文件传真终端规格》.pdf

1、- CEPT T/CD*05-02*E 43 E 2326434 0003749 b =I T/CD 05-02 E Page 1 . Recommendation T/CD 05-02 E (Innsbruck 1981 ) concerning the specification of a CCITT Group 2 document facsimile terminal for the medium to high usage market Recommendation proposed by Working Group T/WG 10 “Data Communication” (CD)

2、 Text of the Recommendation adopted by the “Telecommunications” Commission: “The Conference of European Post and Telecommunications Administrations, Considering - that CC1- Recommendation T.3 describes the standardisation of Group 2 facsimile apparatus for document - that CCITT Recommendation T.30 d

3、escribes the procedures for document facsimile transmission in the General - that GT/CD has studied the harmonization of facsimile equipment under the auspices of Question CD7; - that the procedures for certifying private Data terminal equipment TE) and Data circuit terminating equipment CE) for att

4、achment to the Administrations installations are outlined in Recommendation T/SF 13. transmission ; switched telephone network; Recommends that the attached specification for a CCITT Group 2 document facsimile machine for the medium to high usage market as contained in Annex to this Recommendation s

5、hould apply when such equipment is being considered for purchase by a CEPT Administration for use with its Telefax service.” O Edition of March 15, 1986 CEPT T/CD*05-02*E 83 2326434 0003750 2 e 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. Annex. Index General Construction Transmitter. Line sig

6、nal requirements . Receiver. . Control procedures for message transmission and reception. Controls Connexion to inc Automatic and manual answering . Local test mode. Routine maintenance . Operating and storage environment. Power supplies and protection . Reliability and component selection. Miscella

7、neous requirements rim 05-02 E Page 3 . 3 . 3 *. . 4 . 5 . 5 . 7 . 9 . 9 . 10 . 10 . 10 . 10 . 10 . 11 . 11 1. GENERAL 1.1. This specification details the performance and facility requirements to be provided by a document facsimile machine which is capable of transmitting and manually and automatica

8、lly receiving an IS0 A4 size document in nominally 3 minutes on the General switched telephone network (GSTN). The technical facilities and the procedural requirements have been selected from within the framework of CCIT Recommendations T.3 and T.30. The document facsimile machine is referred to thr

9、oughout this specification as the “facsimile machine”. The specification covers, amongst others, the following aspects of the facsimile machine: - the mechanical construction; - the technical facilities; - the operational requirements related to the construction and technical facilities; - the perfo

10、rmance of the scanning, transmission, reception and document reproduction facilities; - the procedural requirements to cover both manual and automatic reception of single and multi page 1.2. documents. 1.3. The working life of the facsimile machine when correctly maintained shall be at least 5 years

11、 and the requirements of this specification shall be met oier the whole of this period. Detailed requirements will be specified by the appropriate Administration. The facsimile machine detailed in this specifcationis required to meet the needs of the medium to high usage market. 1.4. e 2. CONSTRUCII

12、ON 2.1. General The particular method of construction shall be determined by the manufacturer but shall cotlform to good engineering practice. Any special requirements will be defined by the appropriate Administration. 2.2. Dimensions The facsimile machine shall have dimensions suitable for use in a

13、 normal office environment and shall be suitable for desk top mounting. The facsimile machine shall be housed in a single enclosure and shall be readily transportable. 2.3. Weight The weight of the facsimile machine shall not exceed 30 kg (excluding consumables). When appropriate, hand holds shail b

14、e provided located with respect to the centre of gravity of the facsimile machine so as to facilitate easy and safe lifting. ,7 Edition of March 15, 1986 CEPT T/CD*05-02*E 1 P 2326414 0003753 4 E T/CD 05-02 E Page 4 2.4. Test points Adequate test points shall be provided to facilitate installation a

15、nd maintenance testing. 2.5. Component designation All components shall be clearly identifiable from their circuit diagram designation. The designation may be included on the component (where sufficient space exists) or on the facsimile machine e.g. printed wiring boards. Wherever possible, componen

16、ts shall not obscure their designation. 2.6. Accessibiiy All components and wiring shall be readily accessible for maintenance purposes. 3. TRANSMITTER 3.1, Document dimensions The facsimile machine shall be capable of accepting and scanning documents with dimensions up to a minimum of 212 mm x 299

17、mm x 0.15 mm. It is preferred that the facsimile machine shall be capable of accepting and scanning documents whose thickness is greater than O. 15 mm. 3,2. Document scanning The document shall be scanned from left to right with subsequent scans adjacent to and below the previous scan. The direction

18、 of scanning refers to viewing the document in the vertical plane. 3,2.1. The total scanning line length shall be 215 mm nominal. 3.2.2. The usable scanning line length shall be 205 mm minimum. The end of the usable scanning line length shall be between O and 1 mm of the nominal position of the righ

19、t hand edge of an IS0 A4 size document. 3.2.3. The Factor of Co-operation shall be 829+ 1%. 3.2.4. The scanning density shall be nominally 3.85 lines per mm. 3,2.5. Scanning rate 3.2.5.1. The scanning line frequency shall be nominally 360 lines per minute. 3.2.5.2. The scanning line frequency during

20、 transmission shall be kept within f 5 parts in lo6 of the nominal value. 3.2.6. Indexing facilities It is desirable that facilities shall be provided to enable the operator to separately select the start of scanning and finish of scanning lines along the document. At the end of the transmission of

21、each document, it is preferred that the start of scanning and finish of scanning lines shall restore automatically to their normal positions. The facsimile machine shall meet the full performance requirements as detailed in paragraph 5.8. when scanning documents which have been handwritten, drawn, t

22、yped or printed in black on material which is white. It is preferred that the facsimile machine shall meet the full performance requirements as detailed in paragraph 5.8. when scanning documents which have been handwritten, drawn, typed or printed in colours other than black on material which is whi

23、te, off-white, buff or a pastel shade. The performance of the facsimile machine shall not be significantly affected by the surface finish of the document being scanned. For black and white documents, the full dynamic range shall be achieved. A black and white document is defined as one which has a r

24、elative visual density of at least one between the background and the inscription. The method of measurement of visual density shall be as defined in ISO/DP 6273. It is desirable that the scanning optics shall be sensitive to shades of grey and presentthem to the modulator as intermediate potentials

25、 between those used to represent “black” and “white”. It is preferred that a linear density response be achieved if this facility is provided. It is preferred that facilities shall be provided to enable the potentials corresponding to “black” and “white” to be service adjustable. 3.2.7. 3.2.8. 3.2.9

26、. Optical sensitivity Edition of March 15, 1986 CEPT T/CD*05-02*E BL 2326434 0003752 b = 3.3. 3.3.1. 3.3.2. 3.3.3. 3.3.4. 3.4. 3.4.1. 3.4.2. 3.4.3. 4. 4.1. 4.1.1. 4.1.2. 4:i.3. 4.1.4. 4.1.5. 4.2. 4.3. 5. 5.1. 5.1.1. 5.1.2. 5.1.3. 5.1.4. 5.1.5. 5.1.5.1. 5.1.5.2. T/CD 05-02 E Page 5 Document loading F

27、acilities shall be provided to enable the document to be transmitted to be correctly loaded into the scanning area. The document may be loaded into the scanning area by one of the following methods: Feeding the document into a slot. Laying the document on a plate or tray. Placing the document in a s

28、tack feeder. Alternative methods to those detailed above may be provided subject to the approval of the appropriate Administration. Document unloading The operator shall be able to retrieve the document easily after it has been scanned or in the event of mains failure. If the loading or unloading of

29、 a document is automatic, a method of premature removal ihall be provided. The document to be transmitted shall not be damaged or smeared by the action of loading into or removal from the scanning area or by the scanning process. LINE SIGNAL REQUIREMENTS Modulation system The modulation system shali

30、 be as detailed in CCITT Recommendation T.3. The carrier frequency shall be 2,100f 10 Hz. The frequency bandwidth of the signal to be transmitted shall be reduced by a compression technique using phase reversal of the carrier. The phase of the carrier representing “white” may be reversed after each

31、transition through “black” or by another compatible method. Spectral components transmitted to line The permitted line signal spectrum characteristics will be detailed by the appropriate Administration. Facilities shall be provided to enable the output level of the facsimile machine to be adjusted.

32、These facilities shall not be accessible to the operator. The range of adjustment will be detailed by the appropriate Administration. Phasing The facsimile machine shall meet the requirements of CCITT Recommendation T.3. Document transmission The facsimile machine shall meet the requirements of CCIT

33、T Recommendation T.3. RECEIVER The received copy shall be recorded from left to right with subsequent recording lines adjacent to and below the previous line. The direction of recording refers to viewing the received copy in the vertical plane. The total recording line length shall be 215 mm nominal

34、. The usable recording line length shall be 205 mm minimum. The end of the usable scanning line length shall lie between O and 1 mm of the nominal position of the right hand edge of an IS0 A4 size document. The factor of co-operation shall be 829 f 1 %. The recording density shall be nominally 3.85

35、lines per mm. Recording rate The receivers scanning line frequency shall be 360 lines per minute. The receivers scanning line frequency during reception shall be kept within f 5 parts in lo6 of the nominal value. 7 . Edition of March 15, 1986 i I- TfCD 05-02 E Page 6 5,2. 5.2.1, 5.2.2. 5.3. 5.4. 5.4

36、.1. 5.4.2, 5.4.3. 5.5. 5.5.1. 552, 5.5.3. 5.5.4. 5.6. 5#7. 57.1, 5.7.2. 5.8. 5.8.1. Loading If the recording medium is usable on one side only, facilities shall be provided to ensure that the medium is loaded in the correct orientation. Facilities shall be provided such that the medium on which the

37、received copy is to be produced may be correctly loaded into the facsimile machine and automatically fed to the recording position by one of the following methods: Feeding from a continuous roll or stack feeder. The loading operation shall be capable of being carried out quickly by unskilled personn

38、el using the minimum of controls. Alternative arrangements to those detailed above may be provided, subject to the approval of the appro- priate Administration. Received copy - Unloading Upon completion of the reception procedure, the received copy shall be automatically removed from the recording p

39、osition. Alternative methods may be provided subject to the approval of the appropriate Administration. The operator shall be able to retrieve the received copy easily after it has been removed from the recording position. Methods of recording Various methods of recording are acceptable, provided th

40、at the method used conforms to the following requirements: The emission of fumes or particles that are toxic or could cause irritation or injury to operating and/or maintenance personnel is not permitted. The generation of any form of residue etc., the accumulation of which would cause misoperation

41、of the equipment is not permitted unless appropriate facilities are provided to enable the residue to be removed from the facsimile machine. The recording medium and the method of recording shall not utilise chemicals or materials which may be liable to cause deterioration of other documents with wh

42、ich the received copy may be iled or of the received copy itself. The recording medium shall not give rise to harmful effects on operating and/or maintenance personnel. Received copy marking The reception of a signal corresponding to “black” shall result in a dense and consistent marking of the reco

43、rding medium, preferably black. The reception of a signal corresponding to “white” shall result in no marking of the recording medium. The recording medium shall be white or a shade that will not inhibit or reduce legibility. The received copy marking shall be resistant to fading or damage by heat,

44、light or abrasions experienced in normal ofice use. The received copy shall not be damaged or smeared by the action of removal from the recording position or by the recording process. Alarm facilities Facilities shall be provided to indicate to the operator when consumables need or will shortly need

45、 replenishment e.g. toner, ink. Facilities shall also be provided to indicate to the operator when approximately 10% of the recording medium remains. Performance The performance requirements of the facsimile machine will be defined by the appropriate Administration. However, manufacturers should not

46、e that satisfactory performance is required over the large majority of national and international general switched telephone network connexions. The performance of the facsimile machine will be evaluated using the DIN 32 742 Part 7 Issue No. 11 143 facsimile test chart. (Copies of the test chart sho

47、uld be obtained from national standards organisations.) Edition of P varch 1 986 CEPT T/CD*05-02*E AL M 2326414 0003754 T M 5.8.2. 5.8.3. 5.8.4. 5.8.5. 5.8.5.1. 5.8.5.2. 5.8.6. 5.8.7. 6. 6.1. 6.2. 6.2.1. 6.2.2. 6.2.3. 6.2.4. 6.2.5. 6.2.6. 6.2.7. 6.2.8. 6.2.8.1 I 6.2.8.2. T/CD 05-02 E Page 7 The rece

48、iver shall satisfy the specified performance requirements when the received carrier signal is subjected to a frequency drift of however, in some cases the characteristics required may be defined by the appropriate Administration. Automatically set in conjunction with the Lin conditioning signal (see

49、 paragraph 6.2.2.). If provided, an automatic equaliser shall restore to its initial condition when the facsimile machine is switched from the facsimile mode to the telephone mode (see paragraph 8.4.). The automatic equaliser, when provided, shall respond only to signals with a frequency of 1,100 5 56 Hz and 2,100f 16 Hz over the receive signal level range of - 5 to at least -45 dBm. Preferably, the receiver shall be capable of providing to the recording mechanism intermediate shades of grey between the “black” and “white” limits. It is preferred that a linear density r