Posts Tagged ‘rs-232’

  • Using a Control Channel to facilitate virtual meetings

    Using a Control Channel to facilitate virtual meetings

    Jun 29, 10 • In Tips & Hacks

    Data communications protocols are often divided into a┬ácontrol channel and a data channel. An example from electrical engineering are the “control lines” and “data lines” in an RS-232 connector. The FTP protocol uses a similar arrangement, where a control connection is opened to port 21, and a data connection to port 20. The source of this common pattern is the realization that it is fundamentally difficult to manage a conversation using the same channel you are using to have the conversation. It’s hard to say “wait, you’re sending me too much information” if the pipe you you need to send that message on is clogged with all that information. Human conversations use a control channel as well. Our data channel, of course, is our voices. But when people are gathered in a room for a

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