1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
2
3 *************
4 Frontend type
5 *************
6
7 For historical reasons, frontend types are named by the type of
8 modulation used in transmission. The fontend types are given by
9 fe_type_t type, defined as:
10
11
12 .. c:type:: fe_type
13
14 .. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.5cm}|
15
16 .. flat-table:: Frontend types
17 :header-rows: 1
18 :stub-columns: 0
19 :widths: 3 1 4
20
21
22 - .. row 1
23
24 - fe_type
25
26 - Description
27
28 - :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>` equivalent
29 type
30
31 - .. row 2
32
33 - .. _FE-QPSK:
34
35 ``FE_QPSK``
36
37 - For DVB-S standard
38
39 - ``SYS_DVBS``
40
41 - .. row 3
42
43 - .. _FE-QAM:
44
45 ``FE_QAM``
46
47 - For DVB-C annex A standard
48
49 - ``SYS_DVBC_ANNEX_A``
50
51 - .. row 4
52
53 - .. _FE-OFDM:
54
55 ``FE_OFDM``
56
57 - For DVB-T standard
58
59 - ``SYS_DVBT``
60
61 - .. row 5
62
63 - .. _FE-ATSC:
64
65 ``FE_ATSC``
66
67 - For ATSC standard (terrestrial) or for DVB-C Annex B (cable) used
68 in US.
69
70 - ``SYS_ATSC`` (terrestrial) or ``SYS_DVBC_ANNEX_B`` (cable)
71
72
73 Newer formats like DVB-S2, ISDB-T, ISDB-S and DVB-T2 are not described
74 at the above, as they're supported via the new
75 :ref:`FE_GET_PROPERTY/FE_GET_SET_PROPERTY <FE_GET_PROPERTY>`
76 ioctl's, using the :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>`
77 parameter.
78
79 In the old days, struct :c:type:`dvb_frontend_info`
80 used to contain ``fe_type_t`` field to indicate the delivery systems,
81 filled with either ``FE_QPSK, FE_QAM, FE_OFDM`` or ``FE_ATSC``. While this
82 is still filled to keep backward compatibility, the usage of this field
83 is deprecated, as it can report just one delivery system, but some
84 devices support multiple delivery systems. Please use
85 :ref:`DTV_ENUM_DELSYS <DTV-ENUM-DELSYS>` instead.
86
87 On devices that support multiple delivery systems, struct
88 :c:type:`dvb_frontend_info`::``fe_type_t`` is
89 filled with the currently standard, as selected by the last call to
90 :ref:`FE_SET_PROPERTY <FE_GET_PROPERTY>` using the
91 :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>` property.
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.