CEPT T CD 05-01 E-1986 Specification of a CCITT Group 2 Facsimile Terminal for the Low Usage Market《低使用率市场用CCITT二类传真终端规范》.pdf

1、CEPT T/CD*OS-OL*E 80 m 232bYLY 0003728 9 I; - T/CD05-01 E Page 1 o Recommendation T/CD 05-01 E (Brussels 1980, revised at Cannes 1983) concerning the specification of a CCIlT Group 2 facsimile terminal for the low usage market Recommendation proposed by the Working Group T/WG 10 Data Communication (

2、CD) Text of the revised Recommendation adopted by the “Telecommunications” Commission: “The European Conference of Post and Telecommunications Administrations, Considering - the work undertaken within CEPT with a view to harmonising international telecommunications services as well - the studies car

3、ried out within the framework of Question CD 7 and - Recommendation T/SF 12 concerning the services and facilities for an ideal Group 2 facsimile terminal; - Recommendation T/SF 16 concerning the dehition of a public facsimile service on the public switched telephone - Recommendation T/SF 18 concern

4、ing a customers test chart for use with Telefax terminals. Recommends to the member Administrations of the CEPT, which intend to introduce in their network Group 2 facsimile services to apply the specification contained in the Annex. Note: The Annex is an integral part of the Recommendation. as equi

5、pment ; network; e Edition of March 15, 1986 i 1 CEPT T/CD*OS-OL*E 80 2326414 0003729 O 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. T/CD 05-01 E Page 3 Annex. index General . 3 Construction . 3 Transmitter 4 Line signal requirements 5 Receiver. 5 Controls 9 Connexion to line 9 Automaticanswering.

6、 . 10 Routinemaintenance. . 10 Operating and storage environment. . 10 Power supplies and protection 10 Reliability and component selection. . 11 Miscellaneous requirements . 11 Control procedures for message transmission and reception. . 7 1. GENERAL 1.1. This specification details the performance

7、and facility requirements to be provided by a document facsimile machine which is capable of transmitting and receiving an IS0 A4 size document in nominally 3 minutes on the General switched telephone network (GSTN). The technical facilities and the procedural require- ments have been selected from

8、within the framework of CCITT Recommendations T.3 and T.30. The document facsimile machine is referred to throughout this specification as the ?facsimile machine?. The specification covers, amongst others, the following aspects of the facsimile machine: - the mechanical construction; - the technical

9、 facilities; - the operational requirements related to the construction and technical facilities; - the performance of the scanning, transmission, reception and document reproduction facilities; - the procedural requirements to cover both manual and automatic reception of single and multi-page a 1.2

10、. 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 requirements will be specified by the appropriate Administration. The facsimile machine deta

11、iled in this specification is required to meet, for the present time, the needs of the low usage market. 1.4. 2. CONSTRUCTION 2.1. General The particular method of construction shail be determined by the manufacturer but shall conform to good engineering practice. Any special requirements will be de

12、ned by the appropriate Administration. 2.2. Dimensions The facsimile machine shall have dimensions suitable for use in a normal ofice 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 F

13、or a simple manual type of facsimile machine, i.e. one that does not provide automatic answering facilities, the weight shall not exceed 20 kg. The weight of a facsimile machine that does provide automatic answering facilities shall not exceed 30 kg. When appropriate, hand holds shall be provided lo

14、cated 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. O Edition of March 15, 1986 i - CEPT T/CD*05-03*E BO W 2326434 0003730 7 W T/C

15、D 05-01 E Page 4 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, components shal

16、l not obscure their designation. 2,6, Accessibiii ty All components and wiring shall be readily accessible for maintenance purposes. 3. TRANSMITER 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 mm x

17、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, 3.2.1, 3.2.2. 3.2.3. 3.2.4. 3.2.5. 3.2.5.1. 3.2.5.2. 3.2.6. 3.2.7. 3.2,8. 3.2.9. Document scanning The document shall be scanned from left to right

18、with subsequent scans adjacent to and below the previous scan. The direction of scanning refers to viewing the document in the vertical plane. The total scanning line length shall be 215 mm nominal. The usable scanning line length shall be 205 mm minimum. The end of the usable scanning line length s

19、hall be 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 k 1 %. The scanning density shall be nominally 3.85 lines per mm. Scanning rate The scanning line frequency shall be nominally 360 lines per minute. The scann

20、ing line frequency during transmission shall be kept within however, in some cases the characteristics required may be defined by the appropriate Administration. Automatically set in conjunction with the Line conditioning signal (see paragraph 6.2.2.). If provided, an automatic equaliser shall resto

21、re 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 1,1001 56 Hz and 2,1002 16 Hz over the receive signal level range of -5 to

22、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 response be achieved if this facility is provided and that a service adjustable range of grey shades

23、be provided. Preferably, the recording mechanism shall be capable of reproducing the intermediate shades of grey detailed on the facsimile test chart detailed in paragraph 5.8.1. CONTROL PROCEDURES FOR MFSSAGE TRANSMISSION AND RECEPTION For exact details of the formats of the signals specied in this

24、 section, please refer to CCITT Recommenda- tion T.30. The output levels of the signals detailed in this section shall not be higher than that set for the 2,100 Hz carrier signal. When provided, the Line conditioning signal level shall be the same as that set for the 2,100 Hz carrier signal. Transmi

25、tter After switching from the telephone to the facsimile mode and unless the Calling tone signal (CNG) is transmitted, the facsimile machine shall emit no signal above - 60 dBm until the Group identification (GI2 or GI1/2) signal is detected. After detection of the end of GI2 or GI1/2 signal, the fa

26、csimile machine shall transmit the Group 2 command (GC2) signal followed by the Line conditioning signal (optional) and the Phasing signal. The maximum delay between any two signals sent by the transmitter shall not exceed 100 ms. If GI2 or GI1/2 is not detected within 30-40 seconds of switching fro

27、m the telephone to the facsimile mode, the facsimile equipment shall follow the interrupt procedure detailed in paragraph 6.5.1.2. At the end of the Phasing signal, the facsimile machine shall emit no signal above -60 dBm until the Conrmation to receive (CFR2) signal is detected. The facsimile machi

28、ne shall commence transmission of the message within 100 ms of the recognition of the end of the CFR2 signal. If the CFR2 signal is not detected within 3 to 10 seconds of the end of the Phasing signal, the facsimile machine shall follow the interrupt procedure detailed in paragraph 6.5.1.2. Immediat

29、ely following the message, the facsimile machine shall transmit the End of message (EOM) signal, Following transmission of the EOM signal, the facsimile machine shall transmit no signal above -60 dBm but shall look for reception of the Message conkmation (MCF2) signal from the distant receiver. Afte

30、r detection of the end of the MCF2 signal, the facsimile machine shail foilow one of the procedures detailed below : Edition of March 15, 1986 I c- .CEPT T/CD*OS-OL*E 80 2326434 0003734 4 I TICD 05-01 E Page 8 6.2.8.1. 6.2.8.2. 6.2.9. 6.3, 6.3.1. 6.3.1.1. 6.3.1.2. 6.3.2. 6.3,3. 6,3.4. 6.3.5. 6.3.6.

31、6,3,7. 6.3.8. 6.3.9. 6.3.9.1. 6.3.9.2. 6.4. If the facsimile machine wishes to send more than one document without the necessity of operator intervention, it may transmit the Calling tone (CNG) signal and shall return to the beginning of the transmission procedure i.e. looking for the reception of t

32、he GI2 or GI1/2 signal. If it is capable of sending only one document, the facsimile machine shall follow the interrupt procedure detailed in paragraph 6.5.1.1. If the MCF2 signal is not detected within 3 to 10 seconds of the end of transmission of the EOM signal, the facsimile machine shall follow

33、the interrupt procedure detailed in paragraph 6.5.1.2. Receiver After switching from the telephone to the facsimile mode, the facsimile machine shall follow one of the procedures detailed below: If the facsimile machine is provided with facilities to automatically answer incoming calls, it shall tra

34、nsmit the Called station identification (CED) signal followed by the GI2 signal. If the facsimile machine has facilities to automatically answer incoming calls but is used in a manual reception mode, it may transmit the same signal format as in the automatic answer mode. If the facsimile machine is

35、not provided with facilities to automatically answer incoming calls, it shall transmit either the GI2 signal or the CED signal followed by the GI2 signal. During the “silent” periods in the GI2 signal, the facsimile machine shall transmit no signal above -60 dBm and shall look for reception of the G

36、C2 signal. If the GC2 signal is not received within 30-40 seconds after switching from the telephone mode to the facsimile mode, the facsimile machine shall follow the interrupt procedure detailed in paragraph 6.5.2.2. After detection of the GC2 signal, the facsimile machine shall look for the recep

37、tion of the (optional) Line conditioning signal and the Phasing signal. The reception or non-reception of the Line conditioning signal shall not cause misoperation of the facsimile machine. After reception of the Phasing signal and provided that the receiver has synchronised to the distant transmitt

38、er, the facsimile machine shall transmit the Confirmation to receive (CFR2) signal. The CFR2 signal shall not be transmitted before the end of the Phasing signal. If the receiver has not synchronised with the transmitter by the end of the Phasing signal, the facsimile machine shall follow the interr

39、upt procedure detailed in paragraph 6.5.2.2. After transmission of the CFR2 signal, the facsimile machine shall transmit no signal above - 60 dBm and shall look for reception of the message or the EOM signal. If neither the message signal nor the EOM signal is detected within 1 to 2 seconds of the e

40、nd of the CFR2 signal, the facsimile machine shall follow the interrupt procedure detailed in paragraph 6.5.2.2. If the EOM signal is received, then the receiver shall transmit the MCF2 signal after detection of the end of the EOM signal. If the EOM signal is not received after the message, the facs

41、imile machine shall follow the interrupt procedure detailed in paragraph 6.5.2.2. After transmission of the MCF2 signal, the facsimile machine shall follow one of the procedures detailed below: If the receiver is able to receive another document without operator intervention, the facsimile machine s

42、hall transmit the GI2 signal. If the GC2 signal is not detected within 30 to 40 seconds of transmission of the first GI2 signal, the facsimile machine shall follow the interrupt procedure detailed in paragraph 6.5.2.1. If the receiver is not able to receive another document without operator interven

43、tion, it shall follow the interrupt procedure detailed in paragraph 6.5.2. i. Procedure interrupt signal It is permitted to include the facility to transmit the Procedure interrupt signal (PIS) from the facsimile machine when it is operating as a transmitter or a receiver. However, it should be note

44、d that not all facsimile machines may have the facility to detect reception of this signal and interrupt the transmission or reception procedure. It should be noted also that the circuitry used to detect this signal should allow for an additional frequency shift of up to + 6 Hz due to the GSTN conne

45、xion between the 2 facsimile machines. Transmission or reception of PIS shall cause the facsimile machine to follow the interrupt procedure detailed in para- graph 6.5,1.2, or 6.5.2.2. as appropriate. Edition of March 15, 1986 6.5. 6.5.1. 6.5.1.1. 6.5.1.2. 6.5.2. 6.5.2.1. 6.5.2.2. 6.5.2.3. 6.5.3. 6.

46、6. 7. 7.1. 7.2. 7.3. 8. 8.1. 8.2. 8.3. 8.3.1. CEPT T/CD*OS-OL*E AO 0 232b414 0003735 b I* T/CD 05-01 E Page 9 Interrupt procedure Transmit ter If the facsimile machine satisfactorily completes the transmission procedure (see paragraph 6.2.8.), is shall switch from the facsimile mode to the telephone

47、 mode (see paragraph 8.4.) and shall operate an audible alarm. If the telephone handset is off-hook, the audible alarm shail operate until reset by the operator. If the telephone handset is on-hook, the audible alarm shall operate for a short period not exceeding one second. If the facsimile machine

48、 does not receive the GI2, GI1/2, CFR2 or MCF2 signal within the specied time limits (see paragraphs 6.2,3., 6.2.5. and 6.2.9. respectively), it shall operate an audible and visual alarm and shall also switch from the facsimile mode to the telephone mode (see paragraph 8.4.). If the telephone handse

49、t 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 shall operate until reset by the operator. The visual alarm shall be clearly designated to indicate that the transmission procedure has not been completed satisfactorily e.g. “Error”. Receiver If the facsimile machine satisfactorily completes the reception procedure (see paragraph 6.3.9.), it shall switch from the facsimile mode to the telephone mode and shall operate an