The History Of The Modem :: Technology History

The modem, which is an acronym for modulator/demodulator, was invented in the 1950s for military use. Manufactured by the now ordinary figurer company, IBM, modems were use as persona of an air-defense system their purpose was to touch base various airbases and ascendancy centers. Modems argon devices that mix (modulate) and rive (demodulate) signals, allowing star computer to connect to another. They slay the info over telephone lines by victimisation analog waves and the modem whence converts the waves back and forth. The first modems were designed to hold a telephones receiver in a cradle and had wire connections that went from the cradles to the computer. Today, most modems are either inhering or external hardware devices.Before the computer modem, there was the com- style. When an internecine modem card is placed inside of a computer, it behaves as a COM2 or COM3 carriage. It is also possible connect serial mice into one of these ports (Gilbert, 1996). Async hronous confabulation is used in the PC COM port. distributively byte of data is a separate unit and the computer that is sending the data house pause amongst any two bytes of the message. However, the receiver of the message whitethorn have to full stop the data as quickly as it arrives. This is through with(p) by the a synch data requiring one extra phone number price of succession to communicate the new bytes beginning and once extra bit worth of time at the end. This is what is known as the cacography and run off bits. This means that a 2400 baud modem could transfer only 240 bytes of data per second. Each byte would require a minimum of 10-bit times. This was once called start-stop communication, but asynchronous (a sync, for short) is the signalize (Gilbert, 1995). The modem does not start and stop the bits. They are unfeignedly put protrude as part of the general data compression. The start and stop bits maintain to be generated on the wire that connec ts a COM port to an external modem. The modem COM port is generally piece to use a higher speed amidst the modem and the COM port than what the actual transmission will support. A modem may put away at 14,400-kbps with the COM port configured for 38,400-kbps. This is an example of older technology existence adapted to toy new requirements (Gilbert, 1995).The History Of The Modem Technology HistoryThe modem, which is an acronym for modulator/demodulator, was invented in the 1950s for military use. Manufactured by the now popular computer company, IBM, modems were used as part of an air-defense system their purpose was to connect various airbases and control centers. Modems are devices that mix (modulate) and separate (demodulate) signals, allowing one computer to connect to another. They transfer the data over telephone lines by using analog waves and the modem then converts the waves back and forth. The first modems were designed to hold a telephones receiver in a crad le and had wire connections that went from the cradles to the computer. Today, most modems are either internal or external hardware devices.Before the computer modem, there was the com-port. When an internal modem card is placed inside of a computer, it behaves as a COM2 or COM3 port. It is also possible connect serial mice into one of these ports (Gilbert, 1996). Asynchronous communication is used in the PC COM port. Each byte of data is a separate unit and the computer that is sending the data can pause between any two bytes of the message. However, the receiver of the message may have to catch the data as quickly as it arrives. This is done by the a synch data requiring one extra bit worth of time to announce the new bytes beginning and once extra bit worth of time at the end. This is what is known as the start and stop bits. This means that a 2400 baud modem could transfer only 240 bytes of data per second. Each byte would require a minimum of 10-bit times. This was o nce called start-stop communication, but asynchronous (a sync, for short) is the name (Gilbert, 1995). The modem does not start and stop the bits. They are actually put out as part of the general data compression. The start and stop bits continue to be generated on the wire that connects a COM port to an external modem. The modem COM port is generally configured to use a higher speed between the modem and the COM port than what the actual transmission will support. A modem may operate at 14,400-kbps with the COM port configured for 38,400-kbps. This is an example of older technology being adapted to meet new requirements (Gilbert, 1995).