MoCA技术在美国已占据90%以上市场份额(2)

Because MoCA technology is so reliable, it can be installed once and operators and consumers never have to worry about it again. It always works. Because it always works, subscribers are not complaining about their service to their pay TV operator. They are happy customers. Happy customers are profitable customers. MoCA makes the customer happy and the operators profitable.

融合网|DWRH.net：据融合网|DWRH.net最新统计，EPON+EoC已成为中国有线电视网络双向化改造公认的主流应用方案之一。但目前，EoC种类众多，采用哪种EoC设备来实现有线电视网络的双向化对于中国有线电视网络运营商至关重要。在这方面，贵联盟有哪些建议？

According to the latest statistics collected by DWRH.net, the combination of EPON (Ethernet Passive Optical Network) + EoC (Ethernet over Coax) has become one of the widely recognized mainstream applications in China's cable TV network two-way transformation. but the market has three major kinds of EoC technologies and which EoC devices should be adopted, which is obviously important for Chinese cable TV network operators in their cable TV network two-way transformation initiatives. What are MoCA’s valuable suggestions in this regard?

MoCA联盟：我们建议，在评估EoC技术时，运营商应该考虑设计初衷面向同轴电缆的技术。并非所有技术都可以在所有媒介上运行。

We recommend that when evaluating EoC technologies, operators should consider choosing the technology that was originally designed for coax.Not all technologies work over all mediums equally well.

例如，HomePlug声称可用同轴电缆，但是它的设计初衷是用于电力线。它并不是为同轴电缆而设计。在一种媒介（电力线）上运行良好并不意味着可以适用于其它媒介，如同轴电缆。MoCA的设计初衷即面向同轴电缆。

For instance, HomePlug claims to work over coax but it was originally designed for use over powerline. It is not native to the medium. Working well on one medium (powerline) does not guarantee it will work over another medium like coax. MoCA was originally designed to work over coax.

我们还建议，决策者应该要求提供独立的现场测试验证资料，以证明宣称的性能。MoCA在2005年对MoCA 1.0进行测试，发现这项技术可以保证110 Mbps的家庭带宽。我们网站上的公开信息版块提供测试的结果。

We also strongly recommend that the decision-maker ask for independently verified field tests to prove performance claims. MoCA conducted tests in 2005 for MoCA 1.0 and found that the technology can deliver 110 Mbps of guaranteed bandwidth throughout the home. We provide the results of the tests on the public portion of our web site.

很多其它标准联盟宣称已经进行了现场测试，如果他们所说的是事实，他们应该非常有信心公布这些信息。如果他们无法提供相关信息，那么我们需要提高警惕。

Many other standards alliances claim to have conducted field tests, but they should be confident enough to provide the information publicly. If they will not provide the information publicly, be very cautious.

另外，不要混淆向后互操作性和向后兼容性。这是两个不同的概念。向后互操作性是指新版本可以和旧版本一同运行。这被称为信号交换。

Also, do not confuse backward interoperability with backward compatibility. The two are not the same. Backward interoperability means that the new version works with the old version. This is called handshaking.

向后兼容性是指新版本不会干扰旧版本而已。新旧版本可以共存，但是不会进行信号交换。

Backward compatibility only means the new version will not interfere with the old version. The new and old version can coexist but there is no handshaking.

这种区别有些类似于认识邻居（兼容性）和邀请他到家里用餐（互操作性）。

This is the difference between talking to your neighbor on the street (compatibility) and inviting him to your house for dinner (interoperable).

向后互操作性的优点意味着运营商可以规划未来几年的技术路线图。他们非常有信心现在购买的设备可以和将来购买的设备一同工作。他们需要升级网络时无需频繁购买新设备。购买新设备的代价太高了。

The advantage of backward interoperability means operators can plan their technology roadmap for the next several years. They can have confidence that the equipment they buy today will work with the equipment they buy tomorrow. They cannot buy new equipment every time they want to upgrade the network. It is too costly.

经常有一些标准组织模糊使用这两个词，企图迷惑和误导大家。如果某个标准组织的代表宣称他们的技术可以向后兼容，你需要进一步问他们是否指互操作。如果他们回答是，你应该要求他们证明这一点。如果他们无法证明，你应该放弃这个选择。

It is not uncommon for some standards bodies to use the two terms interchangeably in an effort to confuse and mislead their audience. If representatives of a standards consortium claims their technology is backward compatible, ask them if they mean interoperable. If they say yes, ask them to prove it. If they can’t prove it, keep shopping.

另外，你应该向标准组织的技术代表索要性能证明。如果他们无法提供第三方测试认证的证明，你应该放弃这个选择。

Also, ask the technology rep of any standard body for proof of their performance claims. If they will not show you proof that is validated by an independent third party test facility, keep shopping.

务必警惕一些无法验证的迷惑性声明以及欺骗性/误导性的语言。MoCA可以证明所有的声明。我们实事求是。(责任编辑：韩杰)