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MODEM AND ITS USES
Transcript of MODEM AND ITS USES
Modem is actually one of the most important hardware devices used in the computer especially for the purpose of networking of the internet. Modems are used to modulate signals of analog types so as to be able to encode the digital information from it. Modems are also used for demodulation of the signals so as to decode the information transmitted
Benefits of modem
Types of Modem
Broad Band Modems
These days the modems area great benefit to be used in the telecommunication systems with the launch of the radio modems. These modems are the microwave modems and can transmit even more than a hundred million bits per second, which is a very high speed for any modem to work on. The launch of the optical fibers has given rise to the optical modems which are now used for the purpose of transmission of data over undersea optical fibers. These modems have unbelievably high rate of transmission, which can reach up to about a billion bits per second.
Broadband modems should still be classed as modems, since they use complex waveforms to carry digital data. They are more advanced devices than traditional dial-up modems as they are capable of modulating/demodulating hundreds of channels simultaneously. Many broadband modems include the functions of a router (with Ethernet and Wi-Fi ports) and other features such as DHCP, NAT and firewall features.
Asymmetric Digital Subscriber Line (ADSL) is a
form of DSL, a data communications technology
that enables faster data transmission over copper
telephone lines than a conventional voice band
modem can provide. It does this by utilizing
frequencies that are not used by a voice telephone call. A splitter – or micro filter - allows a single telephone connection to be used for both ADSL service and voice calls at the same time.
Voice band modem
Soft modem (dumb modem)
A cable modem is a type of modem that
provides access to a data signal sent over the
cable television infrastructure. Cable modems
are primarily used to deliver broadband
Internet access in the form of cable internet,
taking advantage of the high bandwidth of a
cable television network. Multiple cable
modems attached to a single cable can use
the same frequency band, using a low-level media access protocol to allow them to work together within the same channel. Typically, 'up' and 'down' signals are kept separate using frequency division multiple access.
Mohammad Ali Jinnah University
MODEM & ITS USES
M. Rameez Khan
Owais un Nabi
Win modem or Soft modem is a stripped-down modem that replaces tasks traditionally handled in hardware with software. In this case the modem is a simple digital signal processor designed to create sounds, or voltage variations, on the telephone line .Soft modems are cheaper than traditional modems, since they have less hardware components.
DSL originally stood for digital subscriber loop, although in recent years, the term digital subscriber line has been widely adopted as a more marketing-friendly term for ADSL, which is the most popular version of consumer-ready DSL.DSL uses high frequency, while regular telephone uses low frequency on the same telephone line.
Optical modems transmit data over optical fibers. Most intercontinental data links now use optical modems transmitting over undersea optical fibers. Optical modems routinely have data rates in excess of a billion (1x109) bits per second.
Modems are the devices, those are used in the field of communication to Modulate and Demodulate (As the name itself suggests) signals so as to be transmitted over a communication channel.
Voice Band Modems
A voice band modem that turns the digital 1s and 0s of a personal computer into sounds that can be transmitted over the telephone lines of Plain Old Telephone Systems (POTS), and once received on the other side, converts those 1s and 0sback into a form used by a USB, Ethernet ,serial, or network connection.
Uses of Modem
Credit Card Payment Terminal in restaurants, movie theaters, or retail stores
Ticketing machines in trains stations, bus stations, and airports
Pre-pay gas pumps
ATM cash machines+
Stoplight Timing Control
Roadside Digital Signs
Grocery Store Freezer and Cooler Call Center
Golf Course Irrigation system
Cell phone tower maintenance on circuits etc.
Gasoline vapor containment system
Home security monitoring
Synchronization of data at a headquarter location from other branches
Daily Sales information sent to a headquarter location from other branches