ASI to SDI best converters

Asynchronous Serial Interface, or ASI, is a method of carrying an MPEG Transport Stream (MPEG-TS) over 75-ohm copper coaxial cable or multimode optical fiber. This kind of signal processing is quite common in the television industry as a means of delivering broadcast programs from the studio to the final transmission equipment before it reaches all the viewers being home. 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 as a continuous stream with a constant rate at 270 megabits per second or slightly less, depending on the application. It cannot run faster than this, which is the same rate as SDI (Serial Digital Interface) and the rate of a DS4 telecommunications circuit, too which is typically used to transport the stream over commercial telephone/telecommunications digital circuits. The MPEG data bits are encoded by using a technical method called 8B/10B which stands for 8-bit bytes mapped to 10-bit character codes. Encoding provides for and maintains DC balance and makes it possible for the receiving user to get and stay synchronized. When on 75-ohm coaxial cable, ASI is terminated with BNC male connectors on each end. Electrically, the coaxial standard specifies an output voltage of 800 millivolts peak-to-peak, while the receiver must be able to operate from a voltage anywhere from 200 mV to 880 mV. ASI is electrically identical to and has the same bit rate as standard definition SDI. When ASI is on optical fiber, it can run on both multimode fiber and singlemode fiber. 

Serial Digital Interface (SDI) is a serial, digital interface, primarily for the transmission of uncompressed and unencrypted video data via coaxial cable or optical fiber. It is mainly used in the field of professional television studios and in the field of television broadcasters. The SDI interface is specified by the Society of Motion Picture and Television Engineers (SMPTE) and is a further development of analog video standards such as PAL and NTSC. The HD-SDI extension according to the SMPTE 292M standard is currently the predominant link for the transmission of uncompressed image signals for HD, digital intermediate and digital cinema in the studio and production environment. Image, sound and metadata can be transmitted over all HD-SDI connections. HD-SDI, like SDI in general, is found mainly in professional video equipment, and consumers have established lower-performance interfaces. HD-SDI devices are usually found only in studios, rental houses and cinemas. A relatively new field of application is the use in video surveillance systems, where over this standard images of special HD cameras over existing coaxial cable installations can be transmitted. Thus, HD-SDI in this sector enables high resolution images without complete retooling to IP video. The method is used to provide TV and video sets with an easy and efficient conversion to HD quality. 

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 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


These examples of ASI to SDI conversion have been very popular units for Thor and have been used globally in countless applications for easy signal conversion and SDI distribution. 

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