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Home   »  Categories   »  Modems

Modems

 
Modems
A modem (modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. The goal is to produce a signal that can be transmitted easily and decoded to reproduce the original digital data. Modems can be used over any means of transmitting analog signals, from driven diodes to radio.

The most familiar example is a voice band modem that turns the digital data of a computer into modulated electrical signals in the voice frequency range of a telephone channel. These signals can be transmitted over telephone lines and demodulated by another modem at the receiver side to recover the digital data.

Modems are generally classified by the amount of data they can send in a given time unit, normally measured in bits per second (bit/s, or bps). They can also be classified by the symbol rate measured in baud, the number of times the modem changes its signal state per second. For example, the ITU V.21 standard used audio frequency-shift keying, aka tones, to carry 300 bit/s using 300 baud, whereas the original ITU V.22 standard allowed 1,200 bit/s with 600 baud using phase shift keying.
 
 

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Trendnet TFM-560U 56K USB
Trendnet TFM-560U 56K USB
Save time with fast data transfer rates

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ADSL 2/2+MODEM ROUTER - TDM-C500
ADSL 2/2+MODEM ROUTER - TDM-C500
ADSL 2/2+ Modem Router TDM-C500

Price: KD7.250
 
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TDM-C504 4-PORT ADSL 2/2+ MODEM ROUTER
TDM-C504 4-PORT ADSL 2/2+ MODEM ROUTER
4-PORT ADSL 2/2+ MODEM ROUTER

Old Price: KD9.500
Price: KD7.500
 
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4PORT ADSL FIREWALL MODEM ROUTER TW100-BRM504
4PORT ADSL FIREWALL MODEM ROUTER TW100-BRM504
4PORT ADSL FIREWALL MODEM ROUTER TW100-BRM504

Price: KD17.000
 
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Huawei4G Router B618
Huawei4G Router B618
Huawei B618 LTE Cat11 Wireless Gateway

Old Price: KD90.000
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