1. A modem or broadband modem is a hardware maker that associate a computer system or router come a broadband network. For example, a cable modem and DSL modem space two examples of these species of Modems.

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Today, a "modem" is most regularly used to explain a broadband modem. However, it additionally describes what was initially considered a modem (described below) to affix to the Internet. To assist prevent confusion, usage the state "broadband modem" and "dial-up modem."


A broadband modem is an external an equipment that connect to her computers and also other network tools using either a network cable or end a wireless connection.

2. Short for modulator/demodulator, a modem is a hardware an equipment that permits a computer system to send and receive information over call lines. Once sending a signal, the machine converts ("modulates") digital data to an analog audio signal, and transmits it end a telephone line. Similarly, as soon as an analog signal is received, the modem converts it earlier ("demodulates" it) to a digital signal.


To aid prevent confusion between a broadband modem, you deserve to refer come this modem together a dial-up modem.

The picture below is an instance of one internal expansion card dial-up modem. Click the image to acquire a summary of every component on the card.


Modems are referred to as an asynchronous device, meaning that the an equipment transmits data in one intermittent present of small packets. As soon as received, the receiving device then take away the data in the packets and also reassembles it into a form the computer system can use.

Stop 1 bitData 8 bitsStart 1 bitStop 1 bitData 8 bitsStart 1 bit
Packet 10 bitsPacket 10 bits

The over chart represents how an asynchronous infection transmits over a phone line. In asynchronous communication, one byte (eight bits) is transferred within one packet, i beg your pardon is identical to one character. However, because that the computer system to receive this information, every packet must contain a Start and a avoid bit; therefore, the complete packet would certainly be ten bits. The over chart is a transmission of words HI, i beg your pardon is indistinguishable to two bytes (16 bits).

History that the modem

The first modem, well-known as the Dataphone, was released by at&t in 1960. It later on became more common for residence users when Dennis Hayes and Dale Heatherington released the 80-103A modem in 1977.

Dial-up modems were generally used by computer systems to connect to the net through the early on 2000s till broadband web started to be much more widely available. As broadband internet became obtainable and popular, dial-up modems were provided by fewer computer users. Today, computer systems no longer come v a dial-up modem, requiring individuals who need one to purchase and install it.

What walk a modem sound like?

If friend did not flourish up on a dial-up modem or you"re nostalgic, you can listen to a modem connecting to the web in the sound paper below. Every time someone associated to the Internet, they heard these noises over the modem speaker.


In this audio file, you hear the modem dialing a phone number and then interacting with the various other modem end the call line. The squealing noise heard after ~ the phone call number is the modem developing a connection (handshaking). Once the connection is established, the modem walk silent.

Why walk a modem need to make this noise?

The computer uses a digital signal. However, a phone line the was designed because that voices provides an analog signal. The modem makes these noises and tones come transmit digital information over an analog line.

Types of computer system modems

Below are the four versions of a computer system modem found in computers.

Onboard modem - Modem built onto the computer system motherboard. This modems cannot be removed, however can it is in disabled through a jumper or BIOS setup.

Internal modem - Modem the connects come a PCI slot inside a newer desktop computer computer, or ISA slot top top an older computer. The interior modem shown above is an example of a PCI modem.


External modem - Modem in a box that connects come the computer externally, utilizing a serial harbor or USB port. The picture is an instance of an external USRobotics modem.

Removable modem - Modem used with older laptops PCMCIA slot and also can be added or gotten rid of as needed.

What room the speeds of modems?

Modem rate is measure in bps and also Kbps, which is the speed the modem have the right to send and receive data. Today, a 56 K (56,000 bps) modem is the fastest solution and also speed provided with today"s dial-up modem.


The line quality that the phone communicates over, and how plenty of collocations it must use, additionally affects the speed of a modem. Although a modem might be rated together 56 K, if the heat quality and also collocations are not optimal, friend cannot attain the preferably speed. Also, when a modem develops a connection to an additional modem not utilizing the exact same standard or a lower speed, the lowest rate is used.

Earlier speed of modems consisted of 110 baud, 300 baud, 1200 baud, 2400 baud, 4800 baud, 9600 baud, 14.4k, 28.8k, and 33.6k.

Modem features and also standards

A modem may also include part or all of the features and also specifications noted below.

Data/Voice - Modems v voice ability that switch between a voice and data communication.

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Why is a modem one input and output device?

A Modem is taken into consideration an input and output maker because it sends out data (upload/output) and also receives data (download/input).

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