Digital TV has started as a free broadcast medium as well.

数字电视系统也是由信号广播发起。

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In the downstream direction, the PON is a broadcast medium.

在下行方向，PON是一种广播介质。

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Broadcast medium called best for reaching poor and illiterate.

大力提倡广播业覆盖贫困和文盲人口等。

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Or so goes the theory as it's been applied by regulators since the days when radio was the only broadcast medium available.

FORBES: Free the Airwaves

Free-speech advocates argue that the Internet, unlike a broadcast medium, requires users to pay access fees and that then they must persistently search out sites.

CNN: Debate rages over bill to restrict 'Net smut

For instance, as I previously wrote, many companies treat social media as a broadcast medium, when social media should be a mechanism for one-to-one and many-to-many conversations with customers, employees, investors, and other key stakeholders.

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