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【速搜问答】准同步网是什么

问答 admin 2周前 (04-19) 23次浏览 已收录 0个评论

汉英对照:
Chinese-English Translation:

准同步网是网内各时钟速率或各同步子网的基准时钟的速率被限制在规定限值内的同步网。

A quasi synchronous network is a synchronous network in which the rate of each clock in the network or the reference clock of each synchronous subnet is limited within a specified limit.

准同步网是网内各时钟速率或各同步子网的基准时钟的速率被限制在规定限值内的同步网。

A quasi synchronous network is a synchronous network in which the rate of each clock in the network or the reference clock of each synchronous subnet is limited within a specified limit.

同步网简介

Introduction of synchronous network

同步网是为电信网内所有电信设备的时钟(或载波)提供同步控制信号,使它们的频率工作在共同速率(或频率)上的支撑网。电信网内任何两个数字交换设备的时钟速率差超过一定值时,接收信号交换的缓存读写时钟会产生速率差,当该差值超过某一定值时将产生滑码,会造成接收数字流的误码或失步。同步网的功能就在于使交换设备时钟频率相同,以消除或减少滑码。

Synchronization network is a supporting network which provides synchronization control signals for all the clocks (or carriers) of the telecommunication equipment in the telecommunication network to make their frequencies work at the same rate (or frequency). When the clock rate difference between any two digital switching devices in the telecommunication network exceeds a certain value, the buffer read-write clock of the received signal exchange will produce a rate difference. When the difference exceeds a certain value, it will produce a sliding code, which will cause bit error or out of step of the received digital stream. The function of synchronous network is to make the clock frequency of switching equipment the same, so as to eliminate or reduce the sliding code.

“同步”指通信双方的定时信号符合特定的频率或相位关系,即两个或两个以上信号在相对应的有效瞬间,其相位差或频率差保持在约定的允许范围之内,根据不同区分,同步被分为位同步、帧同步和网同步。

“Synchronization” means that the timing signals of two or more communication parties conform to a specific frequency or phase relationship, that is, the phase difference or frequency difference of two or more signals at the corresponding effective moment remains within the agreed allowable range. According to different distinctions, synchronization is divided into bit synchronization, frame synchronization and network synchronization.

同步网的功能在于使网内全部数字交换设备的时钟频率工作在共同的速率上,以消除或减少滑动。

The function of the synchronous network is to make the clock frequency of all the digital switching devices in the network work at the same rate, so as to eliminate or reduce the slippage.

同步网可分为准同步网和同步网两类。由具有相同标称频率的不同基准时钟互相比对的同步网称为准同步网。由单一基准时钟控制的称为同步网。

Synchronous network can be divided into quasi synchronous network and synchronous network. A synchronous network with different reference clocks of the same nominal frequency is called a quasi synchronous network. A synchronous network controlled by a single reference clock is called a synchronous network.

定义

definition

准同步网是网内各时钟速率或各同步子网的基准时钟的速率被限制在规定限值内的同步网。

A quasi synchronous network is a synchronous network in which the rate of each clock in the network or the reference clock of each synchronous subnet is limited within a specified limit.

在准同步网中,所有时钟信号具有同一标称速率,而速率的变化限制在规定范围内。

In a quasi synchronous network, all clock signals have the same nominal rate, and the change of the rate is limited within the specified range.

借助缓冲技术,每两个准同步时钟间的 64kbit/s 承载通路的滑动应在 72 天以上出现一次。

With the help of buffer technology, the sliding of 64 kbit / s bearer path between two quasi synchronous clocks should occur more than 72 days.

各个国家同步网之间按准同步方式工作。国内存在一组同步子网时,同步子网间也应按准同步方式工作。军用战术移动通信主要采用准同步方式工作。

Each national synchronous network works in quasi synchronous mode. When there is a group of synchronous subnets in China, the synchronous subnets should also work in quasi synchronous mode. Military tactical mobile communication mainly adopts quasi synchronous mode.

准同步

Quasi synchronization

在一个数字网中各个节点上,分别设置高精度的独立时钟,这些时钟产生的定时信号以同一标速率出现,而速率的变化选择在规定范围,故滑动率是可以接受的。各节点之间没有定时信号的传输链路,以及校准时钟的控制信号。  优点:网络结构简单,由于各节点时钟均为独立时钟,不受其它节点时钟的控制,网络节点的增设与改动都很灵活。  缺点:为保证网络的同步性能,网内各节点时钟应该具有相同的时钟等级,各个时钟都要求有很高的频率精度,网络成本必然很高,而且难以控制管理,网络的同步性能不能得到保证。

In a digital network, high-precision independent clocks are set on each node. The timing signals generated by these clocks appear at the same standard rate, and the change of rate is within the specified range, so the sliding rate is acceptable. There is no transmission link of timing signal and control signal of calibration clock between nodes. Advantages: the network structure is simple, because each node clock is independent clock, not controlled by the clock of other nodes, the addition and change of network nodes are very flexible. Disadvantages: in order to ensure the synchronization performance of the network, the clock of each node in the network should have the same clock level, and each clock requires a high frequency accuracy, so the network cost must be high, and it is difficult to control and manage, and the synchronization performance of the network can not be guaranteed.

国际网络一般采用准同步方式,可以避免国家之间的从属与牵制;军事通信网络为提高网同步的抗毁能力,一般也采用准同步。

The international network generally adopts the quasi synchronization mode, which can avoid the subordination and containment between countries; in order to improve the survivability of network synchronization, the military communication network also generally adopts the quasi synchronization mode.


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