Flow control: The data stream used to control the modem and the computer has data loss caused by mismatch due to the communication processing speed between the computer and the modem. There is usually hardware flow control (RTS / CTS) and software traffic (XON / XOFF) control. Terminal Simulation: Early computer usage is a host and many of the terminals work together, and now the PC can also mimic the various terminals and can be connected to other computers through the modem. The computer software of the imitation terminal is called terminal simulation. Carrier: Since only the sound signal can only be transmitted on the normal telephone line, the modem is to convert the digital signals on the computer into the sound signal after transmitting. The carrier is actually a sound signal that carries digital information on the computer. The modem requires the carrier signal to communicate with each other, so only the carrier signal is established between the two modems, the modem is called communication. Terminal Rate: Refers to the connection speed between the modem and the computer communication port. This speed should be greater than the carrier rate. Carrier rate: The modem can reach the data transmission speed through the telephone line. The rate of modem that is usually said refers to a carrier rate. Automatic Answer: When there is a ringing signal that receives the phone, the modem automatically begins to answer the other party's call, and establish a connection to communicate computer.
