mirror of https://gitee.com/openkylin/linux.git
83 lines
2.0 KiB
ReStructuredText
83 lines
2.0 KiB
ReStructuredText
.. Permission is granted to copy, distribute and/or modify this
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.. document under the terms of the GNU Free Documentation License,
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.. Version 1.1 or any later version published by the Free Software
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.. Foundation, with no Invariant Sections, no Front-Cover Texts
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.. and no Back-Cover Texts. A copy of the license is included at
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.. Documentation/media/uapi/fdl-appendix.rst.
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..
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.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
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.. _frontend-property-cable-systems:
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*****************************************
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Properties used on cable delivery systems
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*****************************************
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.. _dvbc-params:
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DVB-C delivery system
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=====================
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The DVB-C Annex-A is the widely used cable standard. Transmission uses
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QAM modulation.
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The DVB-C Annex-C is optimized for 6MHz, and is used in Japan. It
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supports a subset of the Annex A modulation types, and a roll-off of
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0.13, instead of 0.15
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The following parameters are valid for DVB-C Annex A/C:
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- :ref:`DTV_API_VERSION <DTV-API-VERSION>`
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- :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>`
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- :ref:`DTV_TUNE <DTV-TUNE>`
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- :ref:`DTV_CLEAR <DTV-CLEAR>`
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- :ref:`DTV_FREQUENCY <DTV-FREQUENCY>`
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- :ref:`DTV_MODULATION <DTV-MODULATION>`
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- :ref:`DTV_INVERSION <DTV-INVERSION>`
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- :ref:`DTV_SYMBOL_RATE <DTV-SYMBOL-RATE>`
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- :ref:`DTV_INNER_FEC <DTV-INNER-FEC>`
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- :ref:`DTV_LNA <DTV-LNA>`
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In addition, the :ref:`DTV QoS statistics <frontend-stat-properties>`
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are also valid.
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.. _dvbc-annex-b-params:
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DVB-C Annex B delivery system
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=============================
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The DVB-C Annex-B is only used on a few Countries like the United
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States.
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The following parameters are valid for DVB-C Annex B:
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- :ref:`DTV_API_VERSION <DTV-API-VERSION>`
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- :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>`
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- :ref:`DTV_TUNE <DTV-TUNE>`
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- :ref:`DTV_CLEAR <DTV-CLEAR>`
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- :ref:`DTV_FREQUENCY <DTV-FREQUENCY>`
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- :ref:`DTV_MODULATION <DTV-MODULATION>`
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- :ref:`DTV_INVERSION <DTV-INVERSION>`
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- :ref:`DTV_LNA <DTV-LNA>`
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In addition, the :ref:`DTV QoS statistics <frontend-stat-properties>`
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are also valid.
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