1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 2 G0BISTELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU4%,%2!0(94%,%2!0(G0G042!.3-)33)/.5-“%2).G0G0/(b) that this numbering method must make it possible to recognize: the type of modulation (amplitude or frequency) on the channel, the nominal modulation rate
2、 and average channel spacing, the position of the channel in the frequency range;(c) it must also be such that, in a heterogeneous system, any change in the composition of the channels doesnot change the numbers of the channels already set up in the system. The transformation of a homogeneous system
3、 intoa heterogeneous one should not alter the numbers of the channels that are retained,unanimously declares the view(1) that the channels in an international VFT system should be numbered as shown in Table 1/R.70 bis;TABLE 1/R.70 bisNumber allocationChannel numbersChannel spacing(Hz)Type of modulat
4、ion001-024101-124151-165201-212301-307401-406120120170240360480amplitudefrequency(2) that the number assigned to a channel should be selected from the series applicable to the type of channeland should correspond to its position in the multiplex table;(3) An example of this procedure is given in Table 2/R.70 bis.2Fascicle VII.1 - Rec. R.70 bis
