计算机术语“digital multiplex hierarchy”的中英文意思、释义、翻译及用法-计算机英汉双解词典

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术语	digital multiplex hierarchy
释义	digital multiplex hierarchy 数字多路复用层次 An ordered scheme for the combination of digital signals by the repeated application of digital multiplexing. Details of one hierarchy recommended by the CCITT and based on the2.048Mbit／s signal formed by a standard 30-channel PCM system are given in Table D-1. \\ \\ Table D-1 \\ \\ Multiplex level No.of channels Gross bit rate \\ primary 30 2.048Mbit／s \\ secondorder 120 8.448Mbit／s (4×2.048) \\ thirdorder 480 34.368Mbit／s (4×8.448) \\ fourthorder 1920 139.264Mbit／s (4×34.368) \\ * It will be noticed that the gross digit rate of each order is slightly higher than the sum of the preceding tributary rates, i.e. 4×2.048=8.192 not 8.448. The extra digit time slots in the multiplexed signal are provided to accommodate digits required for frame alignment, justification and network management purposes. 一种重复使用数字复接技术来组合数字信号的有序方案。表D-1给出了一种层次的细节, 它是CCITT(国际电话电报咨询委员会)建议并以标准30路PCM系统形成的2.048Mbit／s信号为基础的。注意:各级的总速率要稍高于上述从属的速率总和,即4×2.048=8.192,不是8.448。在多路复用的信号里,额外数字时间间隙用于提供帧对准、对齐和网络管理所需要的调节数字。 \\ \\ 表 D-1 \\ \\ 多路复用级别话路数目总比特率 \\ \\ 基级 30 2.048Mbit／s \\ 二级 120 8.448Mbit／s (4×2.048) \\ 三级 480 34.368Mbit／s (4×8.448) \\ 四级 1920 139.264Mbit／s (4×34.368)
随便看	permanent resident volume permanent storage permanent virtual circuit permission permutation box permuted cyclic code permuted index perpendicular magnetic recording perpendicular recording persistence persistence of vision personal code personal computer personal computer security personal disclosure personal identification number personal identifier personality card personality module personalize personal password personal terminal personnel security PERT pertinency factor

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