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Cable dsl modem wikipedia.
A null modem adapter is a small device with plugs on both end which is placed on the end of a normal straight through serial cable to convert it into a null modem cable.
Both a digital subscriber line dsl and cable internet services offer higher speeds than technologies such as dial up modems.
Some internal modems are part of the motherboard.
Broadband cable internet access requires a cable modem at the customer s premises and a cable modem termination system cmts at a cable operator facility typically a cable television headend.
A cable modem is a type of network bridge that provides bi directional data communication via radio frequency channels on a hybrid fibre coaxial hfc radio frequency over glass rfog and coaxial cable infrastructure.
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Cable modems are primarily used to deliver broadband internet access in the form of cable internet taking advantage of the high bandwidth of a hfc and rfog network.
For example a dsl modem will link to a telephone land line which is most commonly connected through your phone service.
A dsl connection can be deployed over existing cable.
From dsl modems to cable modems not all devices are created equal these types of modems can differ with regard to the types of devices they re able to connect.
Modems that connect to the computer by a cable are called external modems.
The two are connected via coaxial cable or a hybrid fibre coaxial hfc plant.
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A digital subscriber line dsl modem is a device used to connect a computer or router to a telephone line which provides the digital subscriber line service for connection to the internet which is often called dsl broadband.
The two main pieces of equipment are a digital subscriber line access multiplexer dslam at one end and a dsl modem at the other end.
Others are inserted into the computer on a pc card.
Dial up modems were the usual kind in the 20th century and dsl modems and cable tv modems are now more used.
Such deployment even including equipment is much cheaper than installing a new high bandwidth fiber optic cable over the same route and distance.
Modems that go inside the computer are internal modems.
