DVB (Digital Video Broadcasting) ASI signal can pass through routing. It can also transmitted threw the microwave transmitters. ASI signal is a protocol how Transport Stream are transmitting. There is a gap between two packets known as coma characters. See full list on bellard.org.
Multi-input CATV QAM / ATSC / DVB-S2 / ISDB-T trans Modulator with IP Out
- DVB-T/T2 Input with 4x receivers, 47 - 862 MHz. 1k (T2), 2k, 4k (T2) 8k, 16k (T2) and 32k (T2) carrier modes. QPSK, 16QAM, 64QAM,128QAM (T2) and 256QAM (T2).
- DVB T2 tutorial. The DVB consortium (based in Europe) elaborated the DVB T2 technologie as an extension of the existing standard DVB-T, in order to allow a better use of the spectral resources by integrating edge cutting signal processing technologies. In the same frequency bandwidth, the expected gains give up to 50% additional bitrate.
See Full List On Linuxtv.org
Inputs are :
- 4 RF Tuners : DVB-S/S2 or QAM or DVB-T or ATSC
- 2 ASI Inputs
Outputs are:
Dv Output
- 2 RF carriers : QAM or ATSC or DVB-T or ISDB-T
- 2 ASI’s Output
- MPTS IP Output
Thor Broadcast Transmodulation systems are a 4 RF input modulator and program stream multiplexer with CAM support via 4 CI slots. They are available for QAM (DVB-C), Satellite (DVB-S/S2), and terrestrial (ATSC)(DVB-T) radio frequency RF signal sources. RF signal types can easily be interchanged by removing the modules(you can not upload firmware to change the modulation functionality, this is hardware based). Full configuration and management is available on the front panel LCD and keypad, and remote access and monitoring is available on a dedicated NMS network port for control through a web browser. Program streams available as well as the IP and ASI inputs can be multiplexed and remapped in any order. Independent output pipes for both ASI and IP are fully configurable. Industry standard support for Conditional Access is provided by 4 Common Interface (CI) slots. These slots support CAM modules such as CableCard or any other system using the PCMCIA interface. This platform is ideal for program aggregation and multiplexing in cable TV headends and corporate MATV systems.
This dissector is able to show the output of satellite receiving equipment. The dissector consists of three 'layers'.
First, the DVB-S2 Modeadaption Header shows details about receiver specific information and signal quality [1].
The DVB-S2 Baseband Frame is the data header for the transmission over satellite [2].
The payload within one baseband frame is encapsulated in DVB-S2 GSE Packets [3]. The GSE packets can be segmented and carry the user data.
Protocol dependencies
UDP: Typically, DVB-S2-BB uses UDP as its transport protocol. The port is not specified.
RTP: Alternatively the output can be sent within RTP messages. This dissector currently only supports UDP dissection.
Example traffic
The screenshot shows dissection of the baseband frames with several segmented and unsegmented GSE frames inside. The data is also available in the example capture file (below).
Wireshark
The DVB-S2 dissector is fully functional. There are some missing features which might be implemented in future (this list is sorted with descending priority, highest priority is on the first bullet):
- reassembly of segmented GSE packets (over several baseband frames)
- display other baseband payload then GSE (e.g. MPE)
- label re-use (display last used label)
- RTP support
- Header extensions
Preference Settings
- Enable dissector
- Enable dissection of GSE data
In the protocol preference settings the DVB-S2 dissector can be globally enabled or disabled. This setting defaults to 'disabled'.
To dissect the content of the captured GSE frame the second check box has to be selected. In case of segmentation of the GSE packets over several baseband frames the dissection of the encapsulated content is not supported at the moment. The default setting is 'disabled', i.e. the content of the GSE frame is displayed as hex data.
Example capture file
The example capture file shows several pings with different sizes encapsulated in baseband frames. The data was sent over satellite with different modulations, fec's and frame lengths (different modeadaption headers).
SampleCaptures/dvb-s2_bb_example.pcap
Display Filter
Show only the protocol based traffic:
External links and Standards reference
Mode Adaption Input and Output Interface
DVB Framing Structure
DVB Generic Stream Encapsulation