使用了通信量调整功能，可以让您获得更快的访问速度。

在没有使用通信量调整功能的情况下，Ping 响应时间很快就上涨到让人诧异的 2 秒，这会在使用 Telnet 或 SSH 的过程中让用户感觉非常的不便。而使用了 cFos 的通信息量调整功能，网络延迟一直保持在正常的水平，并不会发生太大的变化。

仅仅这一点，就可以让你感受到全然不同的冲浪体验！

这也就意味着，当你在网上冲浪的时候，你将不用再去考虑在系统后台有多少数据正在传输着。而如此彻底的降低网络响应延迟时间，也为你在网络游戏中的顺畅程度提供了很大的帮助。

首先，cFos 的通信息量调整技术，是通过测量每个网络连接中，上、下行速率和 Ping 的延迟时间的关系。然后它利用这些信息，对于全部的网络数据传输进行优先级别的调整并对传输进行控制。与此同时，通信量调整功能也会对剩余带宽进行动态分配，适当的将其分配到需要的独立连接中。

对于 cFos 的通信量调整功能，它除了可以通过优先级来调整确认数据包的传输，也可以对其它数据包，例如 Telnet 和 SSH 所使用的数据包进行调整。因此，使用了 cFos 的通信量调整功能，文件分享（P2P 下载程序等）程序或者邮件发送会影响你的网络访问的情况，都将成为历史！

不管我们在这里如何的去称赞它，真正的效果，还是需要你亲身去体验的。

除了对确认数据包的传输进行优先级传输，通信量调整功能还可以让你：

• RX 调整功能
  确保在文件下载过程中让 Ping 的响应时间保持在较低水平（更快的响应速度），即便是同时下载多个文件，也不会因此而相互影响。
• ACK 过滤功能
  可以优化 TCP/IP 确认数据包的传输，从而让上行拥有更充裕的带宽。
• 独立程序的优先级调整功能
  可以让你现在运行的程序或游戏保持较低的带宽使用优先级，让其他更重要的程序有充裕的带宽可以使用而不受影响。
• 高质量的 VoiP 语音通话
  可以通过对 RTP 数据包的识别和优先级调整来实现。
• 通过 Layer-7 分析调整其它协议的优先级别
  可以通过程序内建的过滤规则，对诸如 HTTP、FTP、POP3、SMTP、IcmP、SSH、Telnet 和 DNS 等通讯服务或协议进行调整。

Advanced Traffic Shaping

cFosSpeed traffic shaping consists of two major parts: first, find out the maximum line speeds (send resp. receive) and then, send out data with no more than the sending speed and use a priority queue for the rest of the data. Thus, more urgent data can be sent out first. When receiving, cFosSpeed can not change the order of the data packets to be received, but it can slow down the senders so much that the line is not clogged from that side and ping times are nice and low.

cFosSpeed determines transmission speeds by sending out ping packets. These packets are sent out with a small TTL value, so as to return quickly and produce more accurate timings. For this purpose, cFosSpeed sends regular ICMP echo-request Ping packets or small UDP packets, whatever works better.

Over time, cFosSpeed records the lowest ping time. Then, when later cFosSpeed measures higher ping times, it knows that the line must be congested. To counter that, cFosSpeed will reduce sending and/or receiving speed.

This method works quite well for data transmission media that are very stable and work always with the same speed and latency like DSL or Cable. However, it leads to problems on media with highly varying ping times, like wireless mobile connections (UMTS, CDMA, CDMA 2000, etc). A temporary increase in ping time will cause cFosSpeed to reduce its sending or receiving speed, even if such a spike in ping time might not be caused by a clogged line. Thus, the maximum speed might not reached and cFosSpeed can not use all available bandwidth.

As a solution, cFosSpeed now conducts statistical analysis of ping times over a relative long time period to determine the normal ping time of the connection and the typical deviation from it. This statistical data are dynamically adjusted, so changes in bandwidth or latency are detected and properly reflected. This improves transmission speeds on mobile connections, but also increases responsiveness slightly on DSL or cable connections.

This statistical analysis works fine as long as cFosSpeed can be sure that changes in measured ping times reflect the normal behaviour of the medium. Unfortunately, traffic sent or received over the same line by other users will as well increase the ping times and would poison the statistics and therefore would cause unnecessary slow sending or receiving rates.

cFosSpeed addresses this with its new Net Talk feature: each cFosSpeed connected to the same router (i.e. on the same local network) broadcasts how much data it has sent and received to all other cFosSpeed drivers. This allows all cFosSpeed drivers to adjust their speeds according to the sum of all traffic, not just their own share of it. The result are more accurate statistics, thereby improving the quality of traffic shaping, meaning more data can be transmitted with still low ping times.

• 通信量调整选项和多用户版本

首先，需要声明的一点就是，仅仅测试单独的下载或者上传，只能测量出你的宽带连接的最大下行和上行速率。这也是为什么我们会同时进行至少两个文件的下载或上传来测试 cFos 的通信量调整功能：

不管 cFos 还是 cFosSpeed 都将会对连接进行校准。也就是说，安装此程序之后，通过几天时间的测试和校准，它才能达到最优化的调整效果。在这段时间内，尽可能的进行下载和上传（最好是达到满速），将有助于程序进行校准。

现在来进行一个测试，例如通过电子邮件发送一个最少 5MB 的文件。在一般的连接情况下，需要大概 5 分钟的时间来进行测试。而对于每次测试之后，你应该清空浏览器的缓存并且记录网页打开（完整读取）的时间。为了获取最准确的结果，你应该多测试几次。

下载上传复合测试

此数值越高越好

例如，在一次的上传和下载中，一个典型的 DSL 连接（连接速率：768 kbit/s）所提供的下载速度应该在 87 kbyte/s 左右，上传速度大概在 16 kbyte/s 左右。大概有 11.5 kbyte/s 将会用于上传，而剩余的 4.5 kbyte/s 将会用在处理下载过程中的数据包确认。

最简单并且准确的跟踪 Ping 响应时间的方法就是使用我们提供的免费工具：hrPing

还有其它的网络优化方法吗？