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1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later2 3.. _dvb_frontend:4 5#######################6Digital TV Frontend API7#######################8 9The Digital TV frontend API was designed to support three groups of delivery10systems: Terrestrial, cable and Satellite. Currently, the following11delivery systems are supported:12 13- Terrestrial systems: DVB-T, DVB-T2, ATSC, ATSC M/H, ISDB-T, DVB-H,14 DTMB, CMMB15 16- Cable systems: DVB-C Annex A/C, ClearQAM (DVB-C Annex B)17 18- Satellite systems: DVB-S, DVB-S2, DVB Turbo, ISDB-S, DSS19 20The Digital TV frontend controls several sub-devices including:21 22- Tuner23 24- Digital TV demodulator25 26- Low noise amplifier (LNA)27 28- Satellite Equipment Control (SEC) [#f1]_.29 30The frontend can be accessed through ``/dev/dvb/adapter?/frontend?``.31Data types and ioctl definitions can be accessed by including32``linux/dvb/frontend.h`` in your application.33 34.. note::35 36 Transmission via the internet (DVB-IP) and MMT (MPEG Media Transport)37 is not yet handled by this API but a future extension is possible.38 39.. [#f1]40 41 On Satellite systems, the API support for the Satellite Equipment42 Control (SEC) allows to power control and to send/receive signals to43 control the antenna subsystem, selecting the polarization and choosing44 the Intermediate Frequency IF) of the Low Noise Block Converter Feed45 Horn (LNBf). It supports the DiSEqC and V-SEC protocols. The DiSEqC46 (digital SEC) specification is available at47 `Eutelsat <http://www.eutelsat.com/satellites/4_5_5.html>`__.48 49 50.. toctree::51 :maxdepth: 152 53 query-dvb-frontend-info54 dvb-fe-read-status55 dvbproperty56 frontend_fcalls57