mirror of https://gitee.com/openkylin/linux.git
76 lines
1.6 KiB
ReStructuredText
76 lines
1.6 KiB
ReStructuredText
|
.. -*- coding: utf-8; mode: rst -*-
|
||
|
|
|
||
|
|
.. _frontend-property-cable-systems:
|
||
|
|
|
||
|
|
*****************************************
|
||
|
|
Properties used on cable delivery systems
|
||
|
|
*****************************************
|
||
|
|
|
||
|
|
|
||
|
|
.. _dvbc-params:
|
||
|
|
|
||
|
|
DVB-C delivery system
|
||
|
|
=====================
|
||
|
|
|
||
|
|
The DVB-C Annex-A is the widely used cable standard. Transmission uses
|
||
|
|
QAM modulation.
|
||
|
|
|
||
|
|
The DVB-C Annex-C is optimized for 6MHz, and is used in Japan. It
|
||
|
|
supports a subset of the Annex A modulation types, and a roll-off of
|
||
|
|
0.13, instead of 0.15
|
||
|
|
|
||
|
|
The following parameters are valid for DVB-C Annex A/C:
|
||
|
|
|
||
|
|
- :ref:`DTV_API_VERSION <DTV-API-VERSION>`
|
||
|
|
|
||
|
|
- :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>`
|
||
|
|
|
||
|
|
- :ref:`DTV_TUNE <DTV-TUNE>`
|
||
|
|
|
||
|
|
- :ref:`DTV_CLEAR <DTV-CLEAR>`
|
||
|
|
|
||
|
|
- :ref:`DTV_FREQUENCY <DTV-FREQUENCY>`
|
||
|
|
|
||
|
|
- :ref:`DTV_MODULATION <DTV-MODULATION>`
|
||
|
|
|
||
|
|
- :ref:`DTV_INVERSION <DTV-INVERSION>`
|
||
|
|
|
||
|
|
- :ref:`DTV_SYMBOL_RATE <DTV-SYMBOL-RATE>`
|
||
|
|
|
||
|
|
- :ref:`DTV_INNER_FEC <DTV-INNER-FEC>`
|
||
|
|
|
||
|
|
- :ref:`DTV_LNA <DTV-LNA>`
|
||
|
|
|
||
|
|
In addition, the :ref:`DTV QoS statistics <frontend-stat-properties>`
|
||
|
|
are also valid.
|
||
|
|
|
||
|
|
|
||
|
|
.. _dvbc-annex-b-params:
|
||
|
|
|
||
|
|
DVB-C Annex B delivery system
|
||
|
|
=============================
|
||
|
|
|
||
|
|
The DVB-C Annex-B is only used on a few Countries like the United
|
||
|
|
States.
|
||
|
|
|
||
|
|
The following parameters are valid for DVB-C Annex B:
|
||
|
|
|
||
|
|
- :ref:`DTV_API_VERSION <DTV-API-VERSION>`
|
||
|
|
|
||
|
|
- :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>`
|
||
|
|
|
||
|
|
- :ref:`DTV_TUNE <DTV-TUNE>`
|
||
|
|
|
||
|
|
- :ref:`DTV_CLEAR <DTV-CLEAR>`
|
||
|
|
|
||
|
|
- :ref:`DTV_FREQUENCY <DTV-FREQUENCY>`
|
||
|
|
|
||
|
|
- :ref:`DTV_MODULATION <DTV-MODULATION>`
|
||
|
|
|
||
|
|
- :ref:`DTV_INVERSION <DTV-INVERSION>`
|
||
|
|
|
||
|
|
- :ref:`DTV_LNA <DTV-LNA>`
|
||
|
|
|
||
|
|
In addition, the :ref:`DTV QoS statistics <frontend-stat-properties>`
|
||
|
|
are also valid.
|