Modems :-
The word modem is short for "modulator -demodulator". Modulation is the name of the process of converting from digital analog. Demodulation is process of converting from analog to digital. The modem enables digital microcomputers to communicate across analog telephone lines. Both voice communications and data communications can be carried over the same telephone line.
The speed with which modems transmit data varies. Communications speed is typical measured in bits per second (bps). The speed, the faster you can send and receive information. For example transferring an image like might take 75 second with a 33.6 kbps modem and only 45 seconds with modem.
There are four basic types of modems :
>The external modem stands apart from the computer and typically is connected by a cable to the computer serial port. Another cable connects the modem to the telephone wall jack. >The Internal Modem consists of a plug-in-circuit board inside the system unit. A telephone cable connects-the modem to the telephone wall jack.
>The PC Card modem is a credit card-size expansion board that is inserted into portable computers. A telephone cable connects the modem to the telephone wall jack.
>The wireless modem is very similar to the external modem. Typically it connects to the computers serial port. Unlike an external modem, it does not connect with a cable. Rather wireless modems send and receive through the air.
The word modem is short for "modulator -demodulator". Modulation is the name of the process of converting from digital analog. Demodulation is process of converting from analog to digital. The modem enables digital microcomputers to communicate across analog telephone lines. Both voice communications and data communications can be carried over the same telephone line.
The speed with which modems transmit data varies. Communications speed is typical measured in bits per second (bps). The speed, the faster you can send and receive information. For example transferring an image like might take 75 second with a 33.6 kbps modem and only 45 seconds with modem.
There are four basic types of modems :
>The external modem stands apart from the computer and typically is connected by a cable to the computer serial port. Another cable connects the modem to the telephone wall jack. >The Internal Modem consists of a plug-in-circuit board inside the system unit. A telephone cable connects-the modem to the telephone wall jack.
>The PC Card modem is a credit card-size expansion board that is inserted into portable computers. A telephone cable connects the modem to the telephone wall jack.
>The wireless modem is very similar to the external modem. Typically it connects to the computers serial port. Unlike an external modem, it does not connect with a cable. Rather wireless modems send and receive through the air.
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