7_3_01.txt

传真编程的一些文档

       racy  of this filter is not critical but the relative transmittance
       at the carrier frequency should be 0.5 with a tolerance of _ |  .05
       and  the  characteristic  should  be sensibly symmetrical about the
       carrier frequency.


                                                      Figure 3/T.3, (M) p.









            7.4 The receiving  apparatus  must  be  capable  of  operating
       correctly  when  the drift of carrier frequency does not exceed its
       nominal value by more than _ | 6 Hz.

            7.5 A fixed compromise equalizer, an automatic equalizer or an
       adaptive  equalizer may be provided in the receiver but this should
       be a matter for further study.



       8       Power at the transmitter output


            The power of  the  white  signal  should  be  adjustable  from
       -15 dBm to 0 dBm but the equipment should be so designed that there
       is no possibility of this adjustment  being  tampered  with  by  an
       operator.  The black level should be at least 26 dB below the white
       level.


       9       Power at the receiver input


            The receiving  apparatus  should  be  capable  of  functioning
       correctly  when  the  received signal level for white is within the
       range 0 dBm to -40  dBm, the latter value being  considered  provi-
       sional.  No  control of receiver sensitivity should be provided for
       operator use.
                                   APPENDIX I
                             (to Recommendation T.3)

                                   Guaranteed
                     reproducible area for Group 2 machines

                        conforming to Recommendation T.3


                                                  Figure I-1/T.3, (M), p.6





       I.1         Horizontal loss



                                                  Figure I-2/T.3, (M), p.7

                                  H.T. [T1.3]
                                  TABLE I-1/T/3
                                    Results

          _____________________________________________________________
                                Left margin  (mm)   Right margin  (mm)
           Horizontal losses        205       210       205        210
          _____________________________________________________________









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       _________________________________________________________________________________
                             Transmitter    a     _0.5%    1.11   1.11     1.11    1.11
        Phasing              Receiver       b     _1.0%    2.22   2.22     2.22|
                                                                               |
                                                                                   2.22
       _________________________________________________________________________________
        Skew                      c         {
        _5 x 10 | uDlF2616
         }                       2.46      2.46    2.46    2.46
       _________________________________________________________________________________
        Enlarging                 d                 -       -      6.46    6.62
       _________________________________________________________________________________
        Paper insertion           f                1.50   1.50     1.50    1.50
       _________________________________________________________________________________
                             Min.           x               -       -      1.00    1.00
        Lost time            Max.           x             5.00      -       -       -
       _________________________________________________________________________________

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                                               Tableau I-1/T.3 [T1.3], p.8





       I.2         Vertical loss



                                                  Figure I-3/T.3, (M), p.9



                                  H.T. [T2.3]
                                  TABLE I-2/T.3

               ___________________________________________________
                                        Top  (mm)    Bottom  (mm)
               ___________________________________________________
                Gripping loss      g       4.0            4.0
               ___________________________________________________
                Paper insertion    h
               ___________________________________________________
                Enlarging + FOC    i        -           15.15
               ___________________________________________________

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