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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 byte's 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" 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).
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Currently, there are several different types of modems that are used in both everyday life and business. In 1994, the standard modem speed was set at 28.8 kbs; it was called the V.34. "At one time just the thought of standardizing a 9.6-kbps modem was amazing. People wondered what the possible applications could be." (Mannes, 1995) Now, speeds are much faster and technology has grown by leaps and bounds.
Ray Wright, director of marketing for Motorola's modem products, says that a V.34 modem can "learn", so to speak, which parts of the spectrum are clearest for the transmission of data. The V.34 standard uses data-compression technology to reach speeds of up to 115.2 kbps between two computers. This, however, may vary if the files being transferred are already zipped (Mannes, 1995).
The cable modem, unlike the original, does not connect through phone lines. Instead, they connect through the same coaxial cable that your television does. In order to connect to the internet using a cable modem, your computer must be equipped with a NIC (Network Interface Card) card, which attaches directly to the motherboard.
"There are only two drawbacks to cable. First, it is a shared connection, meaning you share the "pipeline" with your neighbors. That doesn't mean that your neighbors will know what you are doing on the internet. But it does mean that if all of your neighbors were on the internet downloading large files at the same time, your internet connection would not be as speed as usual The second drawback to cable is also minor. Because cable modem connections are always, they, like DSL connections, make you more vulnerable to hacking and security breaches. For this reason, many cable companies are now providing their customers firewall software to help protect their security." (Berger, 2005)
DSL which stands for digital subscriber line is another form of broadband connection. Unlike the cable modem, the DSL connection goes through the telephone line. Both of them, however, use an external modem to make the connection. Since DSL connects through the phone it is necessary to use what is called a "micro-filter". This device is placed between your telephone line and the wall-jack and enables the external modem to operate on a different frequency than the telephone itself. That way it's possible to talk on the phone while you're on the internet, making business much easier.
For computers to contact each other, the modems must have similar settings. Those settings include the rate at which the data is sent and received, the parity, and data bits. The rate at which the data is received is referred to as the baud rate. It generally ranges from 300 to 28,800 baud. The parity makes sure that the data is valid and is set at either an even or an odd. The data bits tell the receiving computer the size of each character it should expect to receive. Data transfer using faster modems is less costly, than using slower modems. Like the old saying suggests, "time is money", and the faster the data is transferred the less it costs. Advances in modem technology, as well as higher standards, have caused faster versions of modems to grow in popularity. "You can never have a modem that is too fast" (Mannes, 1995).
Modem speeds have increased every few years. Telephone systems themselves, have an internal speed limitation of 64,000-kbps. Without connecting a computer to the phone company, the best data transfer is only half that speed. "This limit is a mathematical limit. It cannot be broken by advances in chip manufacturing." (Gilbert, 1996)
The modem has greatly changed the way we work and live, making it easier to stay connected with people all over the world. Since its invention it has been through a number of technological advancements, like improvements in the baud rate and it will probably continue to see more as the demand arises. The modem not only enables businesses to connect with their customers and suppliers, but it also allows other organizations, such as the military, to stay in touch with all of its branches. Without the modem it would be much more difficult for military bases to exchange data with one another or with the control center. Overall the modem has greatly increased out ability to communicate with one another and in doing so, has simplified our lives.
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