Question

请帮个忙，翻译一下

As digital networks increased in complexity in the early 1980s, demand from network operators and their customers grew for fearures that could not be readily provided within the existing transmisson standards. These features were based on high-order multiplexing through a hierarchy of increasing bit rates up to 140 Mbps or 565 Mbps in Europe and had been defined in the late 1960s and early 1970s along with the introduction of digital transmission over coaxial cables. Their features were constrained by the high costs of transmission bandwidth and digital devices.The multiplexing technique allowed for the combining of slightly nonsynchronous rates, referred to as plesiochronous, which lead to the term plesiochronous digital hierarchy(PDH).

Answer 1

如数传网络的增加复杂在 1980 年代早期中, 从网络操作员和他们的客户为不可以不迟疑地被提供在已存在的 transmisson 标准里面的 fearures 成长。 这些特征经过逐渐增加的一点点的一个阶级组织欧洲的达到 140个百万位元／秒或 565个百万位元／秒的率以高多工法为基础并且在 1960 年代后期和 1970 年代早期内连同在同桥电缆上的数传传输的介绍一起已经被定义。 他们的特征被传输带宽的高度费用和数传装置强迫了。多工法技术考虑到些微地异步率的联合, 提到到如 plesiochronous, 导致术语 plesiochronous 数传阶级组织.(PDH)

Answer 2

如数传网络的增加复杂在 1980 年代早期中, 从网络操作员和他们的客户为不可以不迟疑地被提供在已存在的 transmisson 标准里面的 fearures 成长。 这些特征经过逐渐增加的一点点的一个阶级组织欧洲的达到 140个百万位元／秒或 565个百万位元／秒的率以高多工法为基础并且在 1960 年代后期和 1970 年代早期内连同在同桥电缆上的数传传输的介绍一起已经被定义。 他们的特征被传输带宽的高度费用和数传装置强迫了。多工法技术考虑到些微地异步率的联合, 提到到如 plesiochronous, 导致术语 plesiochronous 数传阶级组织.(PDH)