Computer Dialup Modem

 Modem stands for Modulator and Demodulator The Modem dialup modem is an electronic device that can convert the digital signals into analog signals and analog signals into digital signals it is used on both ends of the connection for data communication between computers through telephone line.
Data is communication through telephone line in the form of analog signals. So data in the form of digital signals from one computer must be converted into analog signals before to transmit it to another computer through telephone line similarly. To receive the data from another computer through telephone line in the form of analog signals must be converted to digital before to store into the computer.
The Modem can be external or internal.
Network interface Card
It is also referred to as LAN adapter or simply LAN card. It is used in local aeration network to establish the communication link between the device computer printers and other device attached on the network usually the personal computers use the network interface Card NIC in Local aera Network use the network interface Card in network

it} Bandwidth isthe information-Carrying capability eta
f expressed in Cycles per Second (Hertz or Hz). Different
different band widths for different purposes. Thereare three
communication lines. They are
E 0 -Voice band or low speed channels Madium band or medium speed channels Broad band or high speed channel
ff‘f’ccminunication is the exchange “or databetween
form Of transmissiorn medium Such as Wiref Cable,
microwave systemP satellite system etc. Data , transmissions means-i sending and receiVing. data through The Continuous signals in waveform are called analog signal.
5 The transfer of data from one place to another in the form ofanalog
1 called analog data transmissions .TV A digital signal consists of individual and discrete electrical pulses bits groupedtogether into bytes.
‘P' Thestransfer' of data from one pia a to another in the form of digital if called digital data transmission A device used to send er transmit data to another device iscalled
A device used to receive messages from another device sender is called Receiver or sink
A set of rules that guides or governs data communication is called protocol l.
Transmissions Medium is a path or channel through which messages is transmitted or receiver from one location to another in a communication system.
Built in programs
These are stored in ROM chips and consist of routines programs which are fundamental to the very working of the computer this consists of programs which interact with the input output device program which check and initiatives the standard and non standard equipment attached to your computer. Programs which do the memory test every time you put on a computer etc.