上行速率

由于普通用户上网时主要是下载数据，所以ADSL根据这种现实情况提出下行速率大于上行速率的方式来提供用户上网，此即不对称数字用户线的由来。

Because the average users use the net mainly to download data , ADSL proposes the way of making the rate of downstream bigger than the upstream according to the realistic situation . As a result Asymmetric Digital Subscriber Line came out .

对于PON系统，针对上行传输速率为155Mb/s时，对突发模式光发射机作了电路设计，在电路设计中采用锁相环频率合成器产生155MHz时钟源系统。

Aiming at the 155Mb / s up-stream velocity of ATM-PON system , we design the circuit of the burst-mode optical transmitter . We make the frequency synthesis of the PLL ( Phase-Locked Loop ) get 155Mb / s clock source .

第四章的做法是从特别注意不同家族背景下流动的不同种类和它们上行的速率来观察明代家族向上流动的历程。

Modus operandi of Chapter 4 starts with paying in particular attention to the varieties and speeds of families from different backgrounds , then observe the proceed of the upward mobility of families in Ming .

xDSL是目前流行的宽带铜线接入技术，其中ADSL具有上行和下行速率不对称的传输特点。

As a copper-based board band access technology , xDSL is prevalent . As a branch of xDSL , ADSL features a different up and down asymmetrical speed .

和「对称数位用户回路」（SDSL）的资料流是对称的，也就是说上行和下行的速率相同。

In HDSL ( High bit-rate DSL ) and SDSL ( Symmetric DSL ) the data stream is symmetric ; that is , the upstream and downstream rates are the same .

HFC网络中上行信道的漏斗噪声是制约上行信道提高传输速率的主要原因。

In the HFC network , the funnelling effect of noise is the main restrict matter of raising the rate in the up stream channel .