IP电话通信标准中的DCS
有人能告诉我 IP 电话通信标准中的“DCS”是什么意思吗？ 我查了一下互联网，发现DCS是一个分布式控制系统，但我认为当我们谈论IP电话通信标准时，这不是相关信息。
Could somebody tell me what does mean 'DCS' in IP telephony communication standards?
I have looked at the internet and found that DCS is a distributed control system, but I think it's not relevant information when we talk about IP telephony communication standards.
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DCS 在您所看到的上下文中可能是数字交叉连接系统，尽管它似乎也是产品名称中包含的一组流行字母，因此请检查它是否不仅仅是您所看到的。
数字交叉连接是一个“盒子”或设备，允许您在数字电路之间进行切换 - 例如，将传入数字“中继”连接到传出数字“中继”或电话“线路”。
您说得对，“纯”IP 电话通常不必使用交叉连接，因为它是分组交换而不是电路交换，但在现实世界中，大多数 IP 电话系统必须与较旧的数字电路网络和设备交互或连接。
因此，您可能会看到充当 IP 电话网络和电路交换数字网络之间网关的设备 - 这些设备通常称为媒体网关。
有关 DSC 的更多信息，请访问：http://en.wikipedia.org/wiki/Digital_cross_connect_system
A DCS is probably a Digital Cross Connect System in the context you have seen it, although it also seems to be a popular set of letters to include in product names, so check that it is not simply this you are seeing.
A digital cross connect is a 'box' or device that allows you switch between digital circuits - e.g. connect an incoming digital 'trunk' to an outgoing digital 'trunk' or phone 'line'.
You are correct that 'pure' IP telephony does not generally have to use cross connects as it is packet switched rather than circuit switched, but in the real world most IP telephony systems have to interface with or connect to older digital circuit networks and equipment.
For this reason you may see devices which act as a gateway between IP telephony networks and circuit switched digital networks - these boxes are often called Media Gateways.
See more about DSC at: http://en.wikipedia.org/wiki/Digital_cross_connect_system