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QAM is used in a variety of communications systems such as Dial-up modems and WiFi. In cable systems, a QAM tuner is linked to the cable in a manner that is equivalent to an ATSC tuner which is required to receive over-the-air (OTA) digital channels broadcast by local television stations when attached to an antenna. Most new HDTV digital ...
In the United States, 64-QAM and 256-QAM are the mandated modulation schemes for digital cable (see QAM tuner) as standardised by the SCTE in the standard ANSI/SCTE 07 2013. In the UK, 64-QAM is used for digital terrestrial television whilst 256-QAM is used for Freeview-HD. Bit-loading (bits per QAM constellation) on an ADSL line
The ATSC tuner module is available for accessing QAM-, OFDM, and QPSK-based networks. In addition to receiving inputs from digital networks, most tuners are also capable of tuning analog broadcasts. Tuners can be divided into three broad categories: Broadcast In-band (IB) Tuner.
Most cable companies require a set-top box (cable converter box) or a slot on one's TV set for conditional access module cards [2] to view their cable channels, even on newer televisions with digital cable QAM tuners, because most digital cable channels are now encrypted, or scrambled, to reduce cable service theft. A cable from the jack in the ...
Fios TV is one of three services offered by Verizon Fios. Fios TV uses QAM technology to deliver signals to a customer's property using its fiber optic cables. [9] At the home, the optical network terminal turns the signal into a radio frequency signal that can be used on a home's existing coaxial cables, feeding the signal to a set-top box ...
A separate tuner is required to receive HD satellite broadcasts. Cable television companies in the U.S. generally prefer to use 256-QAM to transmit HDTV. Many of the newer HDTVs with integrated digital tuners include support for decoding 256-QAM in addition to 8VSB for OTA digital. Cable television companies started carrying HDTV in 2003.
Over time 256-QAM is expected to be included in the ATSC standard. There is also a standard for transmitting ATSC via satellite; however, this is only used by TV networks [citation needed]. Very few teleports outside the U.S. support the ATSC satellite transmission standard, but teleport support for the standard is improving.
CableCARDs are not necessary for viewing unscrambled digital cable channels if the user has a QAM tuner—a feature in some televisions and DVRs. CableCARD support is most common on higher end televisions that include a special slot for the CableCARD and a built-in cable tuner.