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 hot selective information processor company, IBM, modems were apply as jump of an air-defense system their purpose was to connect various airbases and break centers. Modems are devices that mix (modulate) and discern (demodulate) signals, allowing nonpareil estimator to connect to another. They shipping the data over telephone lines by exploitation analog waves and the modem thence 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 sexual or external hardware devices.Before the computer modem, there was the com- fashion. When an intrinsic modem card is placed inside of a computer, it behaves as a COM2 or COM3 air. It is also possible connect serial mice into one of these ports (Gilbert, 1996). Asynchronous talk is used in the PC COM port. to each one byte of data is a separate unit and the computer that is sending the data feces pause amidst any two bytes of the message. However, the receiver of the message may have to view the data as quickly as it arrives. This is do by the a synch data requiring one extra eccentric person expense of snip to promulgate the new bytes beginning and once extra bit worth of time at the end. This is what is known as the mystify and vacate 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 attend (Gilbert, 1995). The modem does not start and stop the bits. They are veridically put break as part of the general data compression. The start and stop bits inhabit to be generated on the wire that connects a COM port to an external modem. The modem COM port is generally set up to use a higher speed betwixt the modem and the COM port than what the actual transmission will support. A modem may break away at 14,400-kbps with the COM port configured for 38,400-kbps. This is an example of older technology being adapted to pair 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 cradle and had wire connections that w ent 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 once called start-stop communicatio n, 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).