SIST EN 60835-3-12:2002

SIST EN 60835-3-12:2002 is a SIST standard for measuring overall system performance on satellite earth stations used in digital microwave radio transmission systems. It is identical to EN 60835-3-12:1995 and follows IEC 60835-3-12:1993. The document tells engineers and testers how to judge the performance of the complete satellite earth station as a system, not just individual equipment blocks.

What does SIST EN 60835-3-12:2002 specify?

SIST EN 60835-3-12:2002 specifies methods of measurement for overall system performance on satellite earth stations. Clause 1 gives the scope, Clause 2 lists the normative references, and Clause 3 explains what counts as the overall system and how the measurement should be approached.

The standard focuses on the complete satellite communications chain as used in practice. It also points readers to the terminal-equipment sections when the test is a simulated one rather than a live on-site system measurement.

What are the key requirements of SIST EN 60835-3-12:2002?

Clause 3 defines overall system performance as the performance of the full satellite communications system. In practice, that means you do not assess only one box or one link element - you look at the full chain.

• Terminal equipment is part of the system. Clause 3 includes SCPC (single-channel-per carrier) common equipment and channel units, as well as TDMA (time division multiple access) common equipment and channel units. In practice, the measurement has to reflect the service equipment that actually carries traffic.
• Station RF/IF equipment is part of the system. Clause 3 names LNA, HPA, and up-down-converters as examples. In practice, the radio-frequency and intermediate-frequency chain must be considered when judging overall performance.
• The antenna is part of the system. Clause 3 includes the antenna in the overall performance view. In practice, the measurement is not just about electronics inside the shelter - the external antenna path matters too.
• The satellite transponder is part of the system. Clause 3 includes the transponder, so the measurement is end-to-end. In practice, overall performance depends on the satellite segment as well as the earth station hardware.
• Actual overall system performance measurements should be done on site. Clause 3 says these measurements should be performed only on site because they are practically impossible to carry out in the factory, even if the antenna and satellite transponder can be simulated. In practice, this tells test teams to plan field measurements rather than rely on bench tests.
• Simulated BER tests are handled elsewhere. Clause 3 says tests such as BER (bit error ratio) versus C/N (carrier-to-noise ratio) under adjacent channel interference are covered in the terminal-equipment sections. In practice, if you are testing simulated performance of terminal equipment, this section is not the place to define that method.

What terms does SIST EN 60835-3-12:2002 define?

• Overall system performance - The performance of the full satellite communications system, including terminal equipment, station RF/IF equipment, antenna, and satellite transponder.
• SCPC (single-channel-per carrier) - A terminal equipment arrangement named by the document as part of the overall system.
• TDMA (time division multiple access) - A terminal equipment arrangement named by the document as part of the overall system.
• LNA - A station RF/IF equipment item named in the standard as part of the measurement chain.
• HPA - Another station RF/IF equipment item named in the standard as part of the measurement chain.
• BER (bit error ratio) - A performance measure used in the simulated tests mentioned by the standard.
• C/N (carrier-to-noise ratio) - A ratio used with BER in the simulated test example given in Clause 3.

Who uses SIST EN 60835-3-12:2002?

This standard is used by engineers who measure and evaluate satellite earth stations, especially in digital microwave radio transmission systems. It is also relevant to test laboratories, system integrators, and field commissioning teams that need to assess performance on site.

Quality managers and buyers can use it to understand what kind of measurement method is being specified before accepting a system or a test plan. It is most relevant in radio relay and fixed satellite communications work.

What changed in SIST EN 60835-3-12:2002 from the previous edition?

SIST EN 60835-3-12:2002 is identified as identical to EN 60835-3-12:1995 and corresponds to IEC 60835-3-12:1993.

Which standards are used with SIST EN 60835-3-12:2002?

The foreword also places this document within IEC 835, whose parts cover common measurements, terrestrial radio-relay systems, and satellite earth stations. That helps readers see where this section sits in the wider measurement series.

What does the SIST EN 60835-3-12:2002 document contain?

The document contains a short foreword, then three main clauses: Scope, Normative references, and Overall system performance. Clause 3 is the key technical part and identifies which equipment items belong to the overall system.

It also explains the practical testing context: actual overall system measurements are on-site, while simulated BER-based tests under adjacent channel interference are handled by the terminal-equipment sections. For a reader, this means the document is mainly a measurement-method guide for system-level assessment, not a detailed test recipe with extensive procedures.