The modem is the abbreviation of Modulator (Modulator) and Demodulator (Demodulator). The Chinese is called a modem (called the data machine by Hong Kong and Taiwan). According to the homonym of Modem, it is called "cat" by relatives. It is a device that converts a digital signal into an analog signal by modulation at the transmitting end and converts the analog signal into a digital signal by demodulating at the receiving end.
The so-called modulation is to convert the digital signal into an analog signal transmitted on the telephone line; demodulation, that is, converting the analog signal into a digital signal. Synonymous with a modem.
The English language of the modem is MODEM, which is used as a "translator" for analog and digital signals. There are two types of electronic signals, one is "analog signal" and the other is "digital signal". The telephone line we use transmits analog signals, and the digital signals are transmitted between PCs. So when you want to connect your computer to the Internet via a telephone line, you must use a modem to "translate" two different signals. After connecting to the Internet, when the PC sends information to the Internet, because the telephone line transmits an analog signal, it is necessary to use a modem to "translate" the digital signal into an analog signal before it can be transmitted to the Internet. This process is called "modulation." ". When a PC obtains information from the Internet, since the information transmitted from the Internet through the telephone line is an analog signal, the PC wants to understand them, and must also use the modem to "translate". This process is called "demodulation." . In general, it is called "modulation and demodulation."
The main functions of the modem are as follows:
1. Signal conversion: Convert the data signal sent by the source into an analog signal suitable for analog channel transmission. At the end of the signal, it will complete the conversion opposite to the source and process the waveform with distortion and noise.
2. Synchronous transmission: There is synchronization information in the transmitted data stream. At the receiving end, it synchronously extracts and locks the transmitted synchronization information, which is used to generate the same frequency and the same phase carrier as the source, for the timing generation of the sink. Sampling is used to ensure that the source and sink are synchronized.
3. Compensation interference: Compensation for harmful interference to signals caused by harmful factors.
4. Multiplexing: Channel multiplexing is achieved using a variety of encoding and modulation methods using the orthogonality of the seating numbers.
5. Direct connection: For example, the user can directly connect the modem's telephone line without the acoustic coupling facility; the user can send the sequence information to the modem through the communication link, convert it into a response, and the user can also access the stored software through the PC keyboard software. The phone number in the disk and instructs the modem to dial the number and establish a carrier signal to the host system.
6. Automatic redial: You can redial the last call number to the modem, which is convenient for dialing the number of the carrier signal that is not dialed or not detected because it is busy.
7. Soft Phone Book: Some modems allow users to control the phone through software
8. Baud conversion: The modem can detect the input and output baud rate and convert it to this baud rate.
It should be noted that not all modems have the above functions. In addition, smart modems developed in recent years include error control, data compression, and network management.
600Mbps Wireless-wifi Repeater
About this item
1. Ideal for boosting existing network to hard-to reach area, delivering fast and stable wireless connection, transfer rate up to 600Mbps
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4. Designed with mobility and portability, little gadget with great value, One-touch wireless security encryption with WPS button
5. Ethernet port allows the Extender to function as a wireless adapter to connect wired devices, Compatible with 802.11n/g/b devices
2 Working Modes:(Select
based on your needs)
Repeater Mode
Plug WiFi Booster into your power
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Access Point Mode
Connect your router signal with
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600Mbps Wireless-Wifi Repeater,Wifi Amplifier,Wireless Extender,Wifi Booster For Home
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