While Bell (AT&T) provided modems that attached via direct wire connection to the phone network as early as 1958, their regulations at that time did not permit the direct electrical connection of any non-Bell device to a telephone line.

Leased-line modems can operate in 2-wire or 4-wire mode. ADSL in particular is designed to permit voice calls and data usage over the same line simultaneously. There's no case where you can use just a router. Position a Second Router. From the mere four bits per symbol (9.6 kbit/s), the new standards used the functional equivalent of 6 to 10 bits per symbol, plus increasing baud rates from 2,400 to 3,429, to create 14.4, 28.8, and 33.6 kbit/s modems.

The computer network works in digital mode, while analog technology is used for carrying massages across phone lines. An external dial-up modem plugs into a computer at one end and a telephone line on the other end. This capability is often adaptive so that a modem can discover the maximum practical transmission rate during the connect phase, or during operation. 16QAM uses a 16-point constellation to send four bits per symbol, with speeds on the order of 200 or 400 gigabits per second.As described above, technologies like Wi-Fi and Bluetooth also use modems to communicate over radio at short distances. The dial-up modem was once a widely known technology, since it was mass-marketed to consumers in many countries for Dial-up service has since been largely supplanted by Mass production of telephone line modems in the United States began as part of the Shortly afterwards in 1959, the technology in the SAGE modems was made available commercially as the The 103 modem would eventually become a de facto standard once third-party (non-AT&T modems) reached the market, and throughout the 1970s, independently made modems compatible with the Bell 103 de-facto standard were commonplace.Teletype machines were granted access to remote networks such as the In November 1976, AT&T introduced the 212A modem, similar in design, but using the lower frequency set for transmission. It employs the most powerful coding techniques available at the time, including channel encoding and shape encoding. Some modems are capable of all three functions.Fax modems can be used for computer-based faxing, in which faxes are sent and received without inbound or outbound faxes ever needing to ever be printed on paper. Smart modems typically require more bandwidth than transparent modems, and typically achieve higher data rates. When two pairs are available, bandwidth can be as high as 1.5mbps, a full data Because the signal does not pass through the telephone exchange, no "dialing" is required, and the bandwidth constraints of an ordinary voice call are not imposed. They transmit information that is modulated onto a carrier frequency to allow many wireless communication links to work simultaneously on different frequencies.Transparent modems operate in a manner similar to their phone line modem cousins. News wire services in the 1920s used multiplex devices that satisfied the definition of a modem. Embedded modems may overtake separate modems as tablet sales grow and the incremental cost of the modems shrinks, so by 2016, the ratio may change to 1:1.Like mobile phones, mobile broadband modems can be SIM locked to a particular network provider. Then, with the explosion of the World Wide Web in the mid and late 1990s, dial-up modems emerged as the primary form of internet access in many households around the world. "Voice" and "fax" are terms added to describe any dial modem that is capable of recording/playing audio or transmitting/receiving faxes. Different terms are used for broadband modems, because they are frequently contain more than just a modulation/demodulation component.
This rate is near the theoretical Because high speed connections are frequently used by multiple computers at once, many broadband modems do not have direct (e.g. Unlocking a modem is achieved the same way as unlocking a phone, by using an A modem that connects to a fiber optic network is known as an Fiber optic systems can use quadrature amplitude modulation to maximize throughput. V.32bis was so successful that the older high-speed standards had little to recommend them. The modem plugs into whatever type of infrastructure you have—cable, telephone, satellite, or fiber—and gives you a standard Ethernet cable output that you can plug into any router (or a single computer) and get an Internet connection. USB) PC connections, but connect over a network such as Ethernet or Wi-Fi. Instead, softmodems come with drivers which create an emulated RS-232 port, which standard modem software (such as an operating system dialer application) can communicate with. However, the With an acoustic coupler, an ordinary telephone handset was placed in a cradle containing a speaker and microphone positioned to match up with those on the handset. You can use this kind of network to share files, a printer or another peripheral device, and an internet connection.
While 56,000 bit/s speeds had been available for leased-line modems for some time, they did not become available for dial modems until the late 90s.In the late 90s, technologies to achieve speeds above 33.6kbit/s began to be introduced. ISPs employing this approach often advertise it as "accelerated dial-up". However, a modem with leased-line capability can operate over such a line, and in fact can have greater performance because the line is not passing through the telco switching equipment, the signal is not filtered, and therefore higher analog bandwidth is available.

"Later in the 90s, software-based modems became available. The first devices called modems converted digital data for transmission over analog telephone lines.

How a modem attaches to your network depends on the type of connection you have.