Modem (Modulator Demodulator)

 

Eksternal Modem 

Modem  (Modulator Demodulator) comes from. Modulator is the part that converts the signal information into the carrier signal (carrier) and ready to be delivered, while the demodulator is the part that separates signaling information (that contain data or messages) of the received carrier signal so that the information can be received well. Modem is a combination of both, meaning that the modem is a two-way communication tool. Each remote communication devices generally use a two-way section called "modem", such as VSAT, Microwave Radio, and so forth, but generally the term is better known as the modem hardware that is often used for communication on the computer.

Data from the computer in the form of digital signals given to the modem to be converted into an analog signal, when the modem receives data from the outside in the form of an analog signal, turn the modem back into a digital signal that can be further processed by a computer. Analog signals can be transmitted through multiple media such as telephone and radio telecommunications.

Upon arrival at the destination modem, analog signals are converted into digital signals and transmitted back to the computer. There are two types of modems are physical, ie an external modem and an internal modem.

 

Internal Modem

Kind Of Modem (ModulatorDemodulator)

There are 6 Type Modem we are Recognize it  is :

1. ISDN modem
2. GSM modem
3. Analog modem is a modem that makes analog signals into digital signals
4. ADSL modem

• Modem ADSL technology (Asymetric Digital Subscribe Line) which allows surfing the internet and using analog phones simultaneously. It's easy, for ADSL is given a device called a splitter or divider line. Splitter position when placed in front of the incoming phone line. That is, not recommended for forking line to ADSL modem with voice directly. Splitter tool is useful to remove nuisance when using the ADSL modem. With Splitter both can run simultaneously, so that users can answer and someone with a regular phone call. On the other hand, users can still connect to the Internet via the ADSL modem.

    5. Cable modem is a modem that receives data directly from the service provider through cable TV

    6. CDMA modem

• CDMA modem is a modem that uses a frequency of 800 MHz CDMA or CDMA 1x. And most recently using frequency-EVDO Rev A (3G equivalent) and the latest technology is CDMA EVDO Rev-B.