大家好，我初学通信技术翻译，现在我上传一篇翻译文...

GPRSWant to connect your laptop to your cell phone and surf the web or send emails? GPRS is for you. GPRS stands for General Packet Radio Service. And it's the always-on packet data service for GSM, which is the cell phone standard which most countries of the world use, including Europe, Australia, America (not all carriers) and some parts of Asia. The idea is that you'll connect your GPRS-equipped (also called 2.5G) cell phone to your laptop with a cable or insert a small GPRS-equipped PCMCIA card into your laptop and transmit. GPRS will be most useful for "bursty" data applications such as mobile Internet browsing and e- mail. GPRS has been demonstrated as fast as 115 Kbps. And in theory it can go that fast. But the reality is that you'll get between 20Kbps and 50Kbps throughput — about the speed you get from your dial-up home landline. One big advantage of GPRS is that it's "always on," just like your DSL line, your cable modem or your office network. To send a data message you won't have to waste a minute dialing a number and listening to the modems go through their interminable screeching/connect dance. GPRS is the primary feature of what has become known as 2.5G — the upgrade to today's 2G cell phone network. 1XRTT is the CDMA equivalent of GPRS. See GSM and HSCSD.

GPRS introduces two new network nodes in the GSM Public Land Mobile Network (PLMN): The Serving GPRS Support Node (SGSN), which is at the same hierarchical level as the mobile services switching center (MSC), keeps track of the location of the individual mobile stations (MSs) and performs security functions and access control. The SGSN is connected to the base-station system via Frame Relay. The GGSN provides interworking with external packet-data networks, and is connected with SGSNs via an IP-based GPRS backbone network. Also (from TCP): RTO Retransmission Timeout - A value that triggers packet resend in TCP-IP if no acknowledgement is received, because the protocol assumes the packet has been lost. RTT Round Trip Time (Time required from emission of a packet until an acknowledgement is received. This helps determine the adaptive characteristics of the TCP protocol.

GPRS

你想将笔记本电脑和你的手机相连接，并且在网上冲浪或发送电子邮件吗？GPRS可以为你提供服务。GPRS是通用分组无线业务的英文缩写。为GSM提供在线分组数据服务。它是一种手机标准，在全世界大多数国家得到应用，包括欧洲、澳大利亚、美国（并非所有电信公司）以及亚洲的一些国家。使用方法是用一根电缆或一个小的配有GPRS的PCMCIA卡插入你的笔记本电脑，将带有GPRS功能也称为2.5G的手机与笔记本电脑相连，从而实现传输。GPRS对于“bursty”数据应用例如移动因特网浏览或电子邮件等非常有用。GPRS的速率已经同桌验证可以达到115Kbps。而理论上还可以更快。但是事实上，你可以通过家用拨号线（电话线）获得20Kbps至50Kbps的速率。GPRS的一个突出的优点是“始终在线”，就像你的DSL（数字用户线）、MODEM（调制解调器）或者是办公室网络一样。发送一则数字消息，你不需要浪费时间拨号上网或者是聆听调制解调器拨号时刺耳的声音。目前众所周知的2.5G的基本特性就是GPRS。2.5G是2G蜂窝电话网络的升级版。

在GSM公共陆地移动网络（PLMN）中，GPRS引入了两个新的网络节点：正在服务的GPRS支持节点（SGSN），与移动服务中心（MSC）一样处于同一层次，跟踪个人移动台（MSs）位置，并履行安全功能和接入控制。SGSN通过帧中继接入基站系统。GGSN提供与外部分组数据网络的互连，通过基于IP的干线网络与SGSNs相连接。同样（来自TCP）：RTO(转发超时)——一个参数在TCP/IP中，如果没有收到确认信号，触发器数据包将重发。因为负责数据包的协议丢失。RTT(往返时间）：从数据包发射到收到确认所需要的时间。这个参数可以帮助测定TCP协议的适应特性。

api · 发表于 2004-8-15 21:14:00

沙尘 · 发表于 2004-8-15 21:47:00

GPRS will be most useful for "bursty" data applications such as mobile Internet browsing and e- mail.

GPRS对于“bursty”数据应用例如移动因特网浏览或电子邮件等非常有用。

数据信号的特性是“突发性”(bursty) –不会持续很长的时间，但是大量资料在短时间传送。语音与视讯信号就不同，传送的数量较平均，但是对于资料送达的时间与次序非常重要。

在这里，我觉得直接说突发数据就可以，不用还放(bursty) 。

RTO你可以讲得更流畅些，

RTO Retransmission Timeout - A value that triggers packet resend in TCP-IP if no acknowledgement is received, because the protocol assumes the packet has been lost.

是说到一个值时TCP－IP没有收到响应，就认为所发的包已经丢了，于是重新发送（Retransmission），不是转发是重传。

另外，不必拘于原文语句的次序，表达清楚要紧。

[此贴子已经被作者于2004-8-15 22:02:21编辑过]