Modem
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• 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 light emitting diodes to radio.
•  The most familiar example is a voice band modem that turns the digital data of a personal 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 unit of   time, usually expressed in bits per second
•  Modems can alternatively 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
• Modulation is the process  of changing the form of the signal carrying the information.
•  The demodulation process does the task of extracting information from the signals that are modulated.
•  Analog signals can be transmitted by using devices such as a radio       or a diode.
•  Modems are classified on the basis of two criteria,
  data sent per unit time, change in the state of the signal per unit time
• A computer sends information in the form of digital signals.
•  But the information over the telephone lines needs to be transmitted in the form of analog signals.
•  To solve this problem, the functionality of a modem comes into play.
• It converts the digital signals into analog signals.
•  These analog signals are carried over the telephone lines.
•  When these signals reach another computer, the analog signals are converted back to the digital form by its modem.
• In addition to converting digital signals into analog signals, the modems carry out many other tasks.
• Modems minimize the errors that occur while the transmission of signals.
• They also have the functionality of compressing the data sent via signals.
•  Modems also do the task of regulating the information sent over a network.
• Error Correction : In this process the modem checks if the information they receive is undamaged.
• The modems involved in error correction divide the information into packets called frames.
•  Before sending this information, the modems tag each of the frames with checksums.
• Checksum is a method of checking redundancy in the data present on the computer.
• The modems that receive the information, verify if the information matches with checksums, sent by the error-correcting modem.
•  If it fails to match with the checksum, the information is sent back.

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Datasheet

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Products

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• Way2call telephony device and voice modem products

Uses

• Diagnosing modem problems with hyperterminal
• What a modem does.
• Usrobotics adsl ethernet modem user guide
• Surfbeam 2 modem lock backgrounder
• Man uses 35 cable modems to provide wifi, sued by comcast
• Solving the riddle of global computer & modem use
• Using a modem with vortex devices
• What are uses of the modem

 Process

• Cable modem registration process
• Global modem certifications guide
• Modem signal and line states
• Modem to pxl-500/pxl-510
  connection/power-up process
• Qwest actiontec pk5000
• Single-chip docsis cable modem with dual software network processing enginesem short-cable test
• Surfbeam 2 initial modem lock job aid
• Usb installation

Study

• Cable modem termination system
• Data transfer in dial up modems
• How to configure motorola cable modems (docsis)
• “Isdn modem configuration in supervisor ”
• Multimodem® cdma
• Nxp single-chip docsis
  2.0 cable modem
• Teaching modem concepts and design procedure
  with matlab simulations
• Televises
• What is the function of a modem     

• Suppliers of Bhopal
• Suppliers of China
• Suppliers of China1
• Suppliers of China2
• Suppliers of India
• Suppliers of India 1
• Suppliers of India 2
• List of suppliers
• Suppliers of Singapore

Consultancy

• Consultancy from Uk
• Consultancy from Uk1
• Consultancy from India
• Consultancy from Modem

Company profiles

• Company from Bermuda
• Company from Canada
• Company from India
• Company from India1
• List of Companiy from India
• Company from South Africa
• Company from Uk

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• Huawei and zte remain on top of 2011 mobile broadband modem market, says abi research
• Intel is going after the gigabit cable modem market
• Modem company growing in a competitive market

Application

• Cermetek modem
• Modem frame types
  and applications
• Examples of wireless serial modem
• Gsm modem
• Identify your conexant modem using
  list modem
• Integrated modem + applications : omap 850
• Modem applications
• Power line modem application
  remote control using st7537 and st6

Patent

• Cash handling device having integrated wireless modem
• Method and system for verifying modem status
• Modem unit and mobile communication unit
• Cable modem and network registration method
• Audio, fax and modem capabilities with a digital signal processor of a sound card of a computer system
• Computer with a modem capable of outputting telephone bell signals
• Device-specific pre-provisoining access-limiting for a modem
• Pulse dialing system for voip modem
• Per-bin adaptive equalization in windowed dmt-type modem receiver
• Cable modem and priority setting method thereof
• Method for auxiliary software providing instruction
• Analog modem over current
• Multi band modem
• High speed modem for communication

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