Editing Very-small-aperture terminal (section)

==Constituent parts of a VSAT configuration==
* [[Antenna (radio)|Antenna]]
* [[Block upconverter]] (BUC)
* [[Low-noise block downconverter]] (LNB)
* [[Orthomode transducer]] (OMT)
* Interfacility link cable (IFL)
* [[Satellite Internet access#Indoor unit (IDU)|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 satellite mount. As a consequence it is only 500&nbsp;mW compared with the normal 2W, thus is poorer in rain. Skylogic's [[Tooway]] system also uses an integrated OMT/BUC/LNB assembly called a [[transmit and receive integrated assembly]] (TRIA), which is 3W. For large antennas there are also mechanical struts that prevent them to move due to strong winds, losing the pointing and causing service interruption