In DVB satellite transmission system used QPSK, using QAM cable transmission, terrestrial transmission using COFDM (coded orthogonal frequency division multiplexing) way.

在DVB系统中卫星传输采用QPSK，有线传输采用QAM方式，地面传输采用COFDM(编码正交频分复用)方式。

youdao

Considering for local current situation of network in CangZhou city, mainly analyzed constructing standard and implementary scheme of HFC cable distribution system two-way transformation.

结合沧州市网络的实际情况，主要分析HFC电缆分配系统双向传输改造的建设标准和实施方案。

youdao

"In the past week, our global monitoring system has picked up indications that this cable has finally been activated, although in a rather curious way, " wrote Doug Madory, Renesys' senior researcher.

BBC: 'Curious' Cuban net cable has activated, researchers say