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Modems

Page history last edited by Dmitry Sokolov 6 years, 8 months ago

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https://en.wikipedia.org/wiki/Modem

A modem (modulator-demodulator) is a network hardware device that modulates one or more carrier wave signals to encode digital information for transmission and demodulates signals 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 with any means of transmitting analog signals, from light emitting diodes to radio. A common type of modem is one that turns the digital data of a computer into modulated electrical signal for transmission over telephone lines and demodulated by another modem at the receiver side to recover the digital data.

Modems are generally classified by the maximum amount of data they can send in a given unit of time, usually expressed in bits per second (symbol bit/s, sometimes abbreviated "bps"), or bytes per second (symbol B/s). Modems can also be classified by their symbol rate, measured in baud. The baud unit denotes symbols per second, or the number of times per second the modem sends a new signal. For example, the ITU V.21 standard used audio frequency shift keying with two possible frequencies, corresponding to two distinct symbols (or one bit per symbol), to carry 300 bits per second using 300 baud. By contrast, the original ITU V.22 standard, which could transmit and receive four distinct symbols (two bits per symbol), transmitted 1,200 bits by sending 600 symbols per second (600 baud) using phase shift keying.


Links  

https://en.wikipedia.org/wiki/Category:Modems

Subcategories

R
`    Radio modulation modes (3 C, 48 P)

Pages

 
`    Modem
`0–9
`    1-Meg Modem
`A
`    Acoustic coupler
    Alcatel One Touch X020
    Answer tone
    Apple Modem
    AT command
`B
`    Bell 101 modem
    Bell 103 modem
    Bell 202 modem
    BT Voyager
`C
`    Cable modem
    Carrier frequency
    Com21
    Command and Data modes (modem)
    CompuCom SpeedModem
`D
`    DC-BUS
    Digital subscriber line
    DSL modem
`E
`    Echo (computing)
`F
`    Fax modem
    Freebox
`G
`    Global Village (telecommunications)
    Guard tone
`H
`    Hayes command set
    Hayes Microcomputer Products
    Huawei E220
`I
`    Internet outdial
    ITU V.23
`L
`    Link Access Procedure for Modems
    List of ITU-T V-series recommendations
`M
`    Microcom
    Microcom Networking Protocol
    Microsoft Point-to-Point Compression
    Modem script
`N
`    Nano Ganesh
    Narrowband modem
    NO CARRIER
    Novation CAT
    Null modem
`P
`    Packetized Ensemble Protocol
    PC card modem
    PCMCIA modem
    Pennywhistle modem
    PlayCable
    PocketMail
    Point-to-Point Protocol
`Q
`    Quake Global
`R
`    Remote Access Service
`S
`    Satellaview
    SCSI Multimedia Commands
    Softmodem
    SupraFAXModem 14400
`T

Technicolor Modems
`    Telebit
    Time Independent Escape Sequence
    Timex Sinclair 2050
`V
`    V.92
    Vodafone Mobile Connect USB Modem
    Voice modem command set
    Volksmodem
`W
`    Wideband modem
    Mobile broadband modem
    Qualcomm Gobi
`Y
`    Yamar Electronics Ltd
`Z
`    Zenith Cable Modem
    ZMODEM

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