CEPT T CD 05-03 E-1981 Specification of a CCITT Group 3 Document Facsimile Terminal《CCITT3组文件传真终端规格》.pdf

1、- CEPT T/CD*05-03*E BL 232b4l14 0003767 L W i T/CD 05-03 E Page I Recommendation T/CD 05-03 E (Innsbruck1981) concerning the specification of a CCIlT Group 3 document facsimile terminal Recommendation proposed by Working Group T/WG 10 “Data Communications” (CD) Text of the Recommendaiion adopted by

2、the “Telecommunications” Commission: “The Conference of European Post and Telecommunications Administrations, Considering - that CCIT Recommendation T.4 describes the standardization of Group 3 facsimile apparatus for document - that CCIT Recommendation T.30 describes the procedures for document fac

3、simile 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 IDCE) for attachment to the Administrations install

4、ations are outlined in Recommendation T/SF 13. transmission; switched telephone network; Recommends that the attached specscation for a CCITT Group 3 document facsimile machine as contained in Annex to this Recommendation should apply when such equipment is being considered for purchase by a CEPT Ad

5、ministration for use with its Telefax service.” i Edition of March 15, 1986 CEPT T/CD*05-03*E 83 2326434 0003770 W O 1. 2. 3. 4. 5. 6. 7. 9. 10. 11. 12. 13. 14. 15. a. Index General Construction Transmitter. Line signal requirements . Receiver Control procedures for message transmission and receptio

6、n. Controls Connexion to line Automatic and manual answering . Local test mode. Routine maintenance . Operating and storage environment. Power suppiies and protection . Reliability and component selection. Miscellaneous requirements T/CD 05-03 E Page 3 . 3 . 3 . 4 . 5 . 5 . 7 . a . a . 9 . 9 . 9 . 9

7、 . 10 . 10 . 10 1. GENERAL 1.1. This specification details the performance and facility requirements to be provided by a document facsimile machine using digital redundancy reduction techniques which is capable of transmitting and receiving an IS0 A4 size document on the General switched network (GS

8、TN). The technical facilities and the procedural requirements have been selected from within the framework of CCIT Recommendations T.4 and T.30. The document facsimile machine is referred to throughout this specification as the “facsimile machine”. The specification covers, amongst others, the follo

9、wing aspects of the facsimile machine: - the mechanical construction; - the technical facilities; - the operational requirements related to the construction and technical facilities; - the performance of the scanning, transmission, reception and document reproduction facilities; - the procedural req

10、uirements 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 and the requirements of this specification shall be met over the whole of this period. Detailed requireme

11、nts will be specified by the appropriate Administration. 2. CONSTRUCTION 2.1. General The particular method of construction shall be determined by the manufacturer but shall conform to good engineering practice. Any special construction and stability requirements will be defined by the appropriate A

12、dministration. 2.2. Dimensions The facsimile machine shall have dimensions suitable for use in a normal ofice environment and preferably shall be housed in a single enclosure and shall be readily transportable. It is preferred that the facsimile machine shall be suitable for desk top mounting, but a

13、lternatively, it may be designed to be free standing. 2.3. Weight The weight of the facsimile machine suitable for desk top mounting preferably should not exceed 25 kg. For a free standing machine, the weight preferably should not exceed 50 kg. When appropriate, hand holds shall be provided located

14、with respect to the centre of gravity of the facsimile machine so as to facilitate easy and safe lifting. 2.4. Test points Adequate test points shall be provided to facilitate installation and maintenance testing e.g. at the input and output of the modem. 9 f-7 i 1 Edition of March 15, 1986 CEPT T/C

15、D*05-03*E 11 2326434 00037711 T M T/CD 05-03 E Page 4 2.5, 2.6. 3. 3.1. 3.2. 3.2.1. 3.2.2. 3.2.3. 3.2.4. 3.2.5. 3.2.6. 3.2.7. 3.2.8. 3.3. 3.3.1. 3.3.2. 3.3.3. 3.3.4, Component designation All components shall be clearly identifiable from their circuit diagram. The designation may be included on the

16、component (where sufficient space exists) or on the facsimile machine e.g. printed wiring boards. Wherever possible, components shall not obscure their designation. Accessibility All components and wiring shall be readily accessible for maintenance purposes. TR ANSMIIER Document dimensions The facsi

17、mile machine shall be capable of accepting and scanning documents with dimensions up to a minimum of 212 mm x 299 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. It is preferred also that the facs

18、imile machine shall be capable of accepting and scanning documents of length greater than 299 mm. Scanning track The message area should be scanned in the same direction in the transmitter and receiver. Viewing the message area in a vertical plane, the picture elements should be processed as if the

19、scanning direction was from left to right with subsequent scans adjacent and below the previous scan. The reference position of the document shall be such that the right hand edge lies between picture elements 1703 and 1728 of each scanned line. The scanned line length shall be 21 5 mm f 1 %. There

20、shall be 1728 picture elements along the scanned line. The scanning density shall be nominally 3.85 lines per mm f 1 %. It is preferred that an additional scanning density of 7.7 lines/mm Feedingfiom a continuous roll or stack feeder The loading operation shall be capable of being carried out by uns

21、killed personnel using the minimum of controls. Alternative arrangements to those detailed above may be provided, subject to the approval of the appro- priate Administration. Edition of March 15, 1986 CEPT T/CD*05-03*E 1 = 232b414 0003773 3 TJCD 05-03 E Page 6 5.3. 5.4. 5.4.1. 5.4.2. 5.4.3. 5.5. 5.5

22、.1. 5.5.2. 5.5.3. 5.5.4. 5.5.5. 5,6. 5.7. 5.7.1. 5.7.2. 5.8. 5.8.1. 5.8.2. 58.3. Received copy-Unloading Upon completion of the reception procedure, the received copy shall be automatically removed from the recording position. Alternative methods may be provided, subject to the approval of the appro

23、priate 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 that the method used conforms to the following requirements : The emission of fumes

24、 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 of the equipment is not permitted unless appropriate facilities are provided to

25、 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 which the received copy may be filed or of the received copy itself. The recordin

26、g 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 recording medium, preferably black. The density of “black” shall be at least 0.6 r

27、elative to the recording medium. 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,

28、 light or abrasions experienced in normal ofice use. The recording of 8 lines/mm bar patterns shall have a visible modulation with a contrast of at least 30% (see ISO/DP 6273.2). The received copy shall not be damaged or smeared by the action of removal from the recording position or by the recordin

29、g process. Alarm facilities Facilities shall be provided to indicate to the operator when consumabfes need or will shortly need replenishment e.g. toner, ink. Facilities shall also be provided to indicate to the operator when less than approximately 10% of the recording medium remains. Performance T

30、he performance requirements of the facsimile machine will be defined by the appropriate Administration. However, manufacturers should note that satisfactory performance is required over the large majority of national and international general switched telephone network connexions. The performance of

31、 the facsimile machine will be evaluated using the CCITT Facsimile Test Charts detailed in CCITT Recommendation T.21. The scanning and recording systems of the facsimile machine shall be such that the recorded copy of zone 3.6. of the CCIT Characterisation Test Chart shall contain distinct alternate

32、 lines at least for certain parts of this zone. The receiver shall satisfy the specified performance requirements when the received carrier signal is subjected to a frequency drift of f7 Hz from the nominal value. The performance requirements shall be met in full when the facsimile receiver is recei

33、ving from a transmitter which conforms to the requirements of this specification. CEPT T/CD*05-03*E 3 E 2326434 0003774 5 5.8.4. 5.8.5. 6. 6.1. 6.2. 6.3. 6.4. 6.5. 6.6. 6.7. 6.7.1. 6.7.2. 6.7.3. 6.7.4. 6.8. 6.8.1. T/CD 05-03 E Page 7 The receiver shall satisfy the specified performance requirements

34、when the received signal is within the range -5 to -43 dBm. Administrations may specify that the performance requirements shall be met when the received signal level is below -43 dBm. No control of receiver sensitivity shall be provided for operator use. The receiver shall provide the recording mech

35、anism with the decoded run length signal, each picture element being either “black” or white”. CONTROL PROCEDURES FOR MESSAGE TRANSMISSION AND RECEPTION The facsimile machine shall follow the binary coded control procedures detailed in CCITT Recommenda- tion T.30 and also those detailed in paragraph

36、s 6.6. and 6.7, of this specification. The data signalling rate for the binary coded control procedures shall be 300 bit/s as defined in CCIT Recommendation T.30. For exact details of the formats of the signals specified in this section, please refer to CCITT Recommenda- tion T.30. The output levels

37、 of the signals detailed in this section shall not be higher than that set for the carrier signal. If several compatible scanning line times and data signalling rates are available at the transmitter and the receiver, the shortest scan line time and the highest data signalling rate that can be suppo

38、rted by the telephone line shall be selected automatically by the facsimile machine. If the operator has selected an unavailable scanning line density, the facsimile machine shall automatically revert to the standard scanning line density and transmit the document whilst operating an audible and vis

39、ual alarm. The alarms shall operate for a period of 10-1 5 seconds or less if reset by the operator and the visual alarm shall indicate clearly that the document is being transmitted at a different scanning line density to that which was selected. Facilities shall be provided to enable the operator

40、to transmit the Disconnect (DCN) signal, the facsimile machine shall then follow the interrupt procedure detailed in paragraph 6.9.1.2. Calling station After switching from the telephone to the facsimile mode (see paragraph 8.3.) and unless the Calling tone signal (CNG) is transmitted, the facsimile

41、 machine shall emit no signal above - 60 dBm until the Digital identification signal (DIS) or the Called subscriber identification (CSI) plus DIS are detected. If the facsimile machine wishes to transmit then, after detection of the DIS or CSI+DIS signals and provided there is a compatible Group 3 r

42、eceiver at the called station, it shall transmit theTransmitter station identification (TSI) signal and the Digital command signal (DCS) followed by the training sequence and the Training check (TCF) signal. If the called station does not have a compatible receiver, the facsimile machine shall follo

43、w the interrupt procedure detailed in paragraph 6.8.1.2. If the facsimile machine wishes to receive then, after detection of the DIS or CSI+DIS signals, it shall transmit the Calling subscriber identification (CIG) and Digital transmit command (DTC) signals. Whilst looking for a response to the TSI,

44、 DCS and TCF signals, the facsimile machine shall emit no signal above -60 dBm. Called station After switching from the telephone to the facsimile mode, the facsimile machine shall follow one of the procedures detailed below: 6.8.1.1. When being used in the automatic answering mode, the facsimile ma

45、chine shall transmit the Called station identification (CED) signal followed by the CSI and DIS signals. 6.8.1.2. When being used in the manual answering mode, the facsimile machine shail transmit either the CSI and DIS signals or the CED signal followed by the CSI and DIS signals. 6.8.2. Whilst loo

46、king for a response to the above signals, the facsimile machine shall emit no signal above -60 dBm. , rP i I Edition of March 15, 1986 i CEPT T/CD*05-03*E 81 m 2326434 0003775 7 m TICD 05-03 E Page 8 6.9. 6.9.1. 6.9.1.1. 6.9.1.2, 6.9.2. 6.9.2.1. 692.2. 6.9.3. 6.10. 7. 7$1. 7.2. 7.3. 8. 8.1. 8.2. 8,3

47、. 8.3.1. 8.3.2. 8.3.3. Interrupt procedure Transmitter If the facsimile machine satisfactorily completes the transmission procedure, it shall switch from the facsimile mode to the telephone mode (see paragraph 8.4.) and shall operate an audible alarm. If the telephone handset is off-hook, the audibl

48、e alarm shall operate until reset by the operator. If the telephone handset is on-hook, the audible alarm shall operate for a short period not exceeding 1 second. If the facsimile machine does not satisfactorily complete the transmission procedure, it shall switch from the facsimile mode to the tele

49、phone mode and also operate an audible and visual alarm. If the telephone handset is off-hook, the audible and visual alarms shall operate until reset by the operator. If the telephone handset is on-hook, the audible alarm shall operate for a period of 3 to 5 seconds and the visual alarm shail operate until reset by the operator. The visual alarm shall be clearly designated to indicate that the transmission procedure has not been completed satisfactorily. Receiver If the facsimile machine satisfactorily completes the reception procedure, it shall switch from the fasci