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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