ASI Decoder

Top ASI Decoders

Asynchronous Serial Interface

The Asynchronous Serial Interface (ASI) designates a data format for streaming video data, usually as an MPEG Transport Stream (MPEG-TS). An ASI signal can transmit one or more SD or HD video programs or audio programs.

The data transmission rate can be determined individually. Basically, the ASI signal is the end product of a video compression, (MPEG-2 or MPEG-4) for further transmission, for example via satellite or broadband cable. The ASI standard is maintained by CENELEC, the European Committee for Electro technical Standardization, and is part of the collection of standards known as Digital Video Broadcast, or DVB. ASI carries MPEG data serially as a continuous stream with a constant rate at or less than 270 megabits per second, depending on the application.


Integrated Receiver Decoder

Integrated Receiver Decoder (IRD) is a headend device for deocding the program streams from a variety of different Transport Streams. These streams can come in the form of MPEG Compressed Transport Streams, RF streams, IP streams, or ASI. However the whole point of an IRD is take a stream of one protocol and convert it a different protocol. This can mean converting an IP stream to HDMI, or an RF ATSC 8VSB stream to HD-SDI. In this case CATV Telecom companies often send their entire RF lineups in the form of ASI from one location to another, often times ASI decoders are the best way to pull those program streams out of ASI. 

IRD's can come in many different forms, and recently they are being offered in high density rackmount systems. For example an IRD formerly was able to usually convert a single program stream at a time; however some conversions are now being done in bulk. This is certainly true in the case of RF to IP, and IP to RF. Some commonly refer to these as Gateways, but alas these are still essentially decoders that are manipulating one format of a stream to a different format of the same stream. In most cases ASI decoding is the number one staple in a telecom headend; it's how they transport an entire CATV channel lineup of their offerings from one headend to another in a compact, low bandwidth, transport stream. 



This Device is a Satellite IRD Decoder for DVB-S/S2, ATSC, IP and ASI with SDI Video output. This Unit Supports 608 and 708 closed captioning


  •  RF / IPTV / ASI INPUT  -  All Audio-Video Outputs incl. HDSDI, HDMI, CVBS, Suppoty SD and HD formats up to 1080p/60 
  • Tuner available as OFF AIR ATSC, QAM CABLE, ISDBT, DVBT, DVBC, DMBT - Any standard
  • 10/100 Etherent for IPTV multicast or unicast TS MPEG2/4 Input 
  • H.264 and MPEG-2 Hardware Decoding to HD-SDI, HDMI, YPbPr, and CVBS Outputs
  • Combine programs from both ASI and IP inputs to multiplexed ASI and IP Outputs
  • ASI  input for Remultiplexer option to create a new MUX out as well 48x ip streaming spts out for routing and distribution
  • Cam slot for tv programing description
  • Front panel video monitor for confidence monitoring and troubleshooting
  • Separate multiplexed program transport streams to SPTS IP outputs 32 Max
  • Web server interface for secure browser management and full front panel interface
  • Supports Closed Caption 608 and 708 systems, supports Dolby AC/3 Pass Through
This device is a 4 x RF Quad Tuner IRD that decodes to IP streams and ASI MPTS's. This unit provides inputs that can be set to a different RF channel. The IRD will scan selected channels and discover all Video programs (subchannels) inside the channel


  • Tune and descramble 4 RF carriers including all sub programs and streams (sub-channels)
  • Provide industry standard multiplexed and remapped outputs on ASI & IP
  • 4x IP stream outputs (4 MPTS) in UDP, RTP, or RTSP video protocols
  • Advanced network management system on dedicated network port and IP address
  • Available in 5 tuner configurations for QAM (DVB-C), Satellite (DVB-S2) or OTA (ATSC), ( DVB-T ), (ISDB-T)
  • Supports Closed Caption 608 and 708 systems, supports Dolby AC/3 Pass Through
This Device has 4 different Inputs and all necessary outputs for a PRO-DVB headend. The inputs include IP, ASI, ATSC, and DVBS/S2


  • Demodulation + descrambler + re-mux + decoder modules in one chassis
  • 2 DVB-C/T/T2/S/S2/ATSC-T Tuner inputs optional
  • 1 ASI & 1 IP (UDP) input for re-mux
  • One CAM can decrypt multiple programs from Tuners/ASI/IP
  • BISS descrambling (Up to 120Mbps)
  •  MPEG2 and MPEG4 AVC/H.264  video decoding,
  • Dual channel stereo audio output, or one channel Dolby Digital/Dolby Digital Plus
  • (5.1) channel output (for HDMI/SDI out)
  • Dolby Digital/Dolby Digital Plus Decoding and Pass through
  • IP (1 MPTS & 8 SPTS) over UDP and RTP/RTSP output; ASI out
  • Supports CC and Subtitles          
  • Maximum 128 PID mapping per input
  • Changeable demodulator and decoder modules
  • LCD display, Remote control and Firmware, web NMS management
  • Updates via web


Choosing the best decoder for your ASI platform can be an arduous task. Sometimes multiplexing ASI streams is necessary and then delivering the content to a headend is another issue you may come across. ASI decoding has been a promenant staple of Thor Broadcast which has a variety of IRD's and decoding platforms for conversions and gateways. What can be a somewhat easy task gets harder when you have to change protocols or need higher density options for headend conversions. It's always a good choice to reach out to a veteran professional in the DVB world to ask questions to determine the best course of action. 

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