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In network topology, a cable modem is a network bridge that conforms to IEEE 802.1D for Ethernet networking (with some modifications). The cable modem bridges Ethernet frames between a customer LAN and the coax network. Technically, it is a modem because it must modulate data to transmit it over the cable network, and it must demodulate data ...
A cable modem at the customer is connected via coaxial cable to an optical node, and thus into an HFC network. An optical node serves many modems as the modems are connected with coaxial cable to a coaxial cable "trunk" via distribution "taps" on the trunk, which then connects to the node, possibly using amplifiers along the trunk.
An example handshake of a dial-up modem. Modern dial-up modems typically have a maximum theoretical transfer speed of 56 kbit/s (using the V.90 or V.92 protocol), although in most cases, 40–50 kbit/s is the norm. Factors such as phone line noise as well as the quality of the modem itself play a large part in determining connection speeds.
The two phrases, "customer-premises equipment" and "customer-provided equipment", reflect the history of this equipment.Under the Bell System monopoly in the United States (post Communications Act of 1934), the Bell System owned the telephones, and one could not attach privately owned or supplied devices to the network, or to the station apparatus.
Hayes Microcomputer Products was a US-based manufacturer of modems.The company is known for the Smartmodem, which introduced a control language for operating the functions of the modem via the serial interface, in contrast to manual operation with front-panel switches.
In some business software applications, where groups of users have access to only a sub-set of the application's full functionality, a user guide may be prepared for each group. An example of this approach is the Autodesk Topobase 2010 Help [ 6 ] document, which contains separate Administrator Guides , User Guides , and a Developer's Guide .
USRobotics Courier 2400 Modem with serial cable attached (mid-late 1980s) USR sold its first modem, the Courier , to corporate customers starting in 1979. In 1984, the breakup of AT&T greatly lowered the cost of the testing needed for connection to the telephone network, which led to lower prices and wider use of modems.
Modem class 3G 3G+/4G 4G LTE LTE.5G; Peak data rate (Mbit/s) 3.6 14.4 28.8 42 84 100 150 Modems MDM6270 MDM6200 MDM6600 MDM8200A MDM8215 MDM8220 MDM8225 MDM9200 MDM9215 MDM9600 MDM9615 MDM9225 MDM9625