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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 ...
Novation's first CAT was an external 300 bit/s Bell 103-standard modem that connected to the phone lines using an acoustic coupler.Like most other acoustically coupled modems, the CAT required the user to dial the desired number on a normal telephone, listening to the call connecting and the eventual presence of an answer tone.
Transparent modems are most commonly used by utility companies for data collection. Smart modems come with media access controllers inside, which prevents random data from colliding and resends data that is not correctly received. Smart modems typically require more bandwidth than transparent modems, and typically achieve higher data rates.
Hayes Microcomputer Products was a US-based manufacturer of modems.The company is known for the Smartmodem, which introduced a control language for operating the functions of the modem via the serial interface, in contrast to manual operation with front-panel switches.
Gandalf Technologies, Inc., or simply Gandalf, was a Canadian data communications company based in Ottawa. It was best known for modems and terminal adapters that allowed computer terminals to connect to host computers through a single interface.
User at modem A issues a dial command: AT-Get the modem's ATtention; D-Dial; T-Touch-Tone; 12125550100-Call this number RING: Modem A begins dialing. Modem B's phone-line rings, and the modem reports the fact. ATA: Computer at modem B issues answer command. CONNECT: CONNECT: The modems connect, and both modems report "connect".
The method for recording audio data is the same, except that the command is AT+VRX, or AT#VRX, and the modem transmits audio data while the computer receives it. The RTS/CTS flow control are not used here (the computer must accept all the audio data it receives, and the modem automatically paces its transmission to match the audio sampling rate).
Modem class 3G 3G+/4G 4G LTE LTE.5G; Peak data rate (Mbit/s) 3.6 14.4 28.8 42 84 100 150 Modems MDM6270 MDM6200 MDM6600 MDM8200A MDM8215 MDM8220 MDM8225 MDM9200 MDM9215 MDM9600 MDM9615 MDM9225 MDM9625