1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 8 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU05“,)#G0G0$!4!G0G0.%47/2+342!.3-)33)/. G0G03).!,).G0G0!.$G0G037)4#().!,/#!4)/.G0G0/ amended at Malaga-Torremolinos, 1984)The CCITT,considering thatRecommendations X.50 and X.51 define multiplexing schemes for
2、 international links at 64 kbit/s,unanimously declaresthe following view on the allocation of the tributary channels.On international links carrying data channels multiplexed at 64 kbit/s according to Recommendations X.50and X.51, the allocation of tributary channels at rates of 0.6, 2.4, 4.8 and 9.
3、6 kbit/s within the multiplex frame, shouldbe chosen, by bilateral agreement, among the configurations listed in Table 1/X.54.Note 1 - If, on bilateral agreement, a single 48 kbit/s channel is transmitted, optionally permissible within anX.51 multiplex frame, this configuration is numbered 00.Note 2
4、 - The phase number i (i = 1, . . . , 5) corresponds to the set of envelopes i + 5j (j = 0, . . . , 15 for 80envelope frames; j = 0, . . . , 3 for 20 envelope frames) of each frame. Each phase contains either one 9.6-kbit/s or two4.8-kbit/s or four 2.4-kbit/s or sixteen 0.6-kbit/s channels.2 Fascicl
5、e VIII.3 - Rec. X.54TABLE 1/X.54Allocation of tributary channelsin the 64-kbit/s multiplex frameConfigurationPhase numbernumber1234500 4801 9.6 9.6 9.6 9.6 9.60203049.69.69.69.69.69.69.69.69.69.69.69.64.82.40.60506070809109.69.69.69.69.69.69.69.69.69.69.69.69.69.69.69.69.69.64.84.84.82.42.40.64.82.4
6、0.62.40.60.6111213141516171819209.69.69.69.69.69.69.69.69.69.69.69.69.69.69.69.69.69.69.69.64.84.84.84.84.84.82.42.42.40.64.84.84.82.42.40.62.42.40.60.64.82.40.62.40.60.62.40.60.60.62122232425262728293031323334359.69.69.69.69.69.69.69.69.69.69.69.69.69.69.64.84.84.84.84.84.84.84.84.84.82.42.42.42.40
7、64.84.84.84.84.84.82.42.42.40.62.42.42.40.60.64.84.84.82.42.40.62.42.40.60.62.42.40.60.60.64.82.40.62.40.60.62.40.60.60.62.40.60.60.60.63637383940414243444546474849505152535455564.84.84.84.84.84.84.84.84.84.84.84.84.84.84.82.42.42.42.42.40.64.84.84.84.84.84.84.84.84.84.82.42.42.42.40.62.42.42.42.40.60.64.84.84.84.84.84.82.42.42.40.62.42.42.40.60.62.42.42.40.60.60.64.84.84.82.42.40.62.42.40.60.62.42.40.60.60.62.42.40.60.60.60.64.82.40.62.40.60.62.40.60.60.62.40.60.60.60.62.40.60.60.60.60.6
