Very-small-aperture Terminal - Constituent Parts of A VSAT Configuration

Constituent Parts of A VSAT Configuration

  • Antenna
  • Block upconverter (BUC)
  • Low-noise block downconverter (LNB)
  • Orthomode transducer (OMT)
  • Interfacility link cable (IFL)
  • Indoor unit (IDU)

All the outdoor parts on the dish are collectively called the ODU (Outdoor Unit), i.e. OMT to split signal between BUC and LNB. The IDU is effectively a Modem, usually with ethernet port and 2 x F-connectors for the coax to BUC (Transmit) and from LNB (Receive). The Astra2Connect has an all-in-one OMT/BUC/LNA that looks like a QUAD LNB in shape and size which mounts on a regular TV sat mount. As a consequence it is only 500 mW compared with the normal 2W, thus is poorer in rain. Skylogic's Tooway system also uses an integrated OMT/BUC/LNB assembly named TRIA (Transmit/Receive Integrated Assembly) which is 3W.

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