• Description
  • Specifications
  • Available Options and Ordering Info


Convenient, compact USB adapter that can be used to capture and generate MPEG-2 transport streams (DVB-ASI) and uncompressed serial digital video (SDI). Ideally suited for use with a laptop, but convenient with a standard PC or server too.


  • USB powered – no power supply required
  • Independent operation of DVB-ASI / SDI  input and output:
    –  Full-duplex: combined bit-rate 0-160 MBps
    –  Half-duplex: DVB-ASI and SDI bit-rate range 0-214 MBps
  • 16-Mbytes local hardware buffer for sustained real-time streaming
  • The DTU-245B-SXP comes with StreamXpert for Real-time analysis, monitoring and recording of MPEG-2 transport streams; and StreamXpress for ASI/SDI play out
  • The DTU-245B-SY-SXP includes all software of the DTU-245B-SXP plus  SdEye for SDI analysis and monitoring

DTU-245B Block Diagram:

DTU-245 - FantASI USB-2 ASI / SD-SDI Input+Output Adapter


  • General-purpose USB adapter for capturing, generating and processing of ASI and SDI streams
  • On-site recording and analysis
  • Portable demo set
  • DTU-245B-SXP:        Portable ASI/SDI play-out, recording and decoding
  • DTU-245B-SY-SXP:  Complete bundle for portable Transport Stream and SDI analysis, monitoring and recording,  as well as ASI / SDI play-out



Connector                                   2x 75Ω  BNC  (1 input, 1 output)
Physical Layer                              EN50083-9
Bit Rate Range                             0…160 Mbit/s  –  in full duplex mode
0…214 Mbit/s  – in half-duplex mode
Packet Size in Bytes                     188 or 204
Physical Layer                              SMPTE 259M
Bit Rate                                         270 Mbit/s
#Bits                                              8 or 10 bit

Power (Through USB-2)             5V, 400mA max

Dimensions in mm (LxWxH)      87 x 104 x 30

PC Support:
PC USB port                                 USB-2.0
OS                                                  Windows 7, 8, 10, 11;  Windows Server 12, 16, 19
Linux   >= 2.6.18, 3x, 4x, 5x
Processor                                     Core i5 minimum, Core i7 recommended, or equivalent AMD CPUs

Available Options and Ordering Info

All USA orders will be shipped from our USA warehouse. 

All other orders will be shipped from Canada.



DTU-245B  –   Universal USB-2 ASI/SDI Input+Output adapter

DTU-245B-SLP  –   Universal USB-2 ASI/SDI Input+Output adapter with StreamXpress and StreamXpert Lite

DTU-245B-SXP  –   Universal USB-2 ASI/SDI Input+Output adapter with StreamXpress and StreamXpert

DTU-245B-SY-SXP  –  Universal USB-2 ASI/SDI Input+Output adapter with StreamXpress, StreamXpert and SdEye

DTU-245B-VR-SY-SXP  –  Universal USB-2 ASI/SDI Input+Output adapter with VF-Rec stream recorder, StreamXpress, StreamXpert and SdEye


1.  StreamXpress –  Playout  Software

  • Low-cost, high-performance playout software that supports all DekTec output adapters
  • Endless play with optional automatic correction of continuity-counter, PCR/PTS/DTS and TDT/TOT fields
  • SOAP-based remote control to automate StreamXpress operations (DTC-302-RC option)
  • Saving and restoring playout parameters using XML-based settings file
  • Reproducible injection of errors in the transport stream with adjustable error rate
  • Easy-to-use control of modulation and channel simulation parameters

 2StreamXpert – Transport Stream Analyser Software

  • Real-time analysis, monitoring and recording of MPEG-2 transport streams
  • Recording based on duration, size or manual
  • Provides detailed statistics on the PIDs, services and tables found in the transport stream
  • Displays PIDs, services, tables, descriptors, stream information and PID-grid (compact overview of all PIDs)
  • User definable TR 101 290 templates
  • PCR analysis
  • Measurement of bitrates, PCR-accuracy and interval
  • Integrated SD/HD video and audio decoder with support for MPEG-2, AVC/H.264, HEVC/H.265, AVS, 4:2:2 and 10 bit video streams and MP1 / MP2 / (HE-)AAC / Dolby AC3 / Dolby AC4 audio
  • Deep decoding of PSI, DVB-SI, DVB-RCS and ATSC-PSIP tables and descriptors
  • Closed captions decoding
  • SI decoding with user templates, Dolby AC4 analysis, multi-monitor support
  • Support for analysing TS-over-IP streams via a DTA-2160 / DTA-2162 or a local network port
  • The world’s most cost-effective and user-friendly transport-stream analyser

3.  StreamXpert Lite – Light-weight version of StreamXpert for viewing and recording transport-stream contents, and for decoding audio and video.

                                                             StreamXpert           StreamXpert Lite

Ribbon based GUI                                        ✓                               ✓
List with properties of all PIDs                        ✓                               –
List with properties of all services                   ✓                               partial
List with properties of all tables                      ✓                                –
Video Decoding
HEVC                                                         ✓                                ✓
AVC                                                           ✓                                ✓
AVS                                                           ✓                                ✓
MPEG-2                                                      ✓                                ✓
4:2:2                                                          ✓                                –
10-bit                                                         ✓                                –
Full screen mode                                          ✓                                ✓
Multi-monitor support                                    ✓                                ✓
Audio Decoding
HE-AAC                                                       ✓                                ✓
AAC                                                            ✓                                ✓
E-AC-3                                                        ✓                                ✓
AC-3                                                           ✓                                ✓
MPEG-1 Layer II                                            ✓                                ✓
Supported Interfaces
DekTec input adapters                                  ✓                                 ✓
PC network ports                                         ✓                                 ✓
Custom table and descriptor templates            ✓                                  –
PID Grid, graphical overview of all PIDs             ✓                                  –
Dolby AC-4 analysis                                       ✓                                  –
Manual mode                                               ✓                                  ✓
Size based                                                   ✓                                  ✓
Duration based                                             ✓                                  ✓
Measurement and Compliance
TR 101 290 priority 1, 2 and 3                       ✓                                  –
Bitrate                                                        ✓                                  partial
PCR graphs                                                  ✓                                  –
PCR accuracy                                               ✓                                  –
PCR interval                                                 ✓                                  –
PCR frequency offset                                    ✓                                  –

4SdEye    –    SDI Analysis and Monitoring Software

  • Cost-effective real-time waveform analyser for SMPTE-259M signals
  • Displays picture, YCbCr / RGB waveforms, vectorscope and peak meter
  • Various picture display modes: interlaced, top- or bottom-field only, top and bottom field, full SDI frame
  • User can select whether he wants to display Y, Cb, Cr, R, G and/or B components in the picture
  • Contemporary GUI with quick access buttons and user-selectable window layout
  • Supports all DekTec SDI-capable adapters including bus-powered USB-2 units for portable SDI monitoring

 5.  VF-Rec – Advanced transport-stream/SDI recorder

  • Advanced recorder for TS, ETI, SDI, I/Q samples and T2MI.
  • Allows to do continuous recording and remote control through SNMP
  • Record to a single file, to multiple files or continuous
  • SDI recording 10-bit full frame, up to 3G-SDI
  • Remote monitoring and control through SNMP