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When a modem is in data mode, any characters sent to the modem are intended to be transmitted to the remote party. [1] The modem enters data mode immediately after it makes a connection. For example, if ATDT5551212 resulted in a phone call that was answered by another computer modem, the modem would report the word "CONNECT" and then switch to ...
The Hayes command set includes commands for various phone-line operations such as dialing and hanging-up. It also includes various controls to set up the modem, including a set of register commands which allowed the user to directly set the various memory locations in the original Hayes modem. The command set was copied largely verbatim ...
This status light is directly coupled with what the modem is sending the DCD line. By default, when a modem is powered up, the DCD signal is deasserted. It is not asserted until the modem either makes an outgoing call, or answers an incoming call, and then connects with a data modem on the other end.
If you're using broadband (cable) internet and you can't connect, try the following troubleshooting steps in the order listed until you get up and running again. 1. Check if you can visit other sites with a different browser - If you can go to another site, the problem may be associated the browser you're using.
When the modem wants the computer to temporarily pause so the playback can catch up, it temporarily lowers the CTS (Clear to Send) signal on the RS-232 serial port. The modem re-raises the signal in time for the computer to resume sending audio data before the playback buffer becomes completely empty.
Hayes' slow entry into the high-speed market led to a fracturing of the command set. In order to set up the modem to accept or reject certain types of connections, Hayes had added a number of new commands prefixed by & (the ampersand) to the Smartmodem 2400. Other companies offering 2400 bit/s generally followed the same syntax.
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