SIST EN 60835-1-4:2002/A1:2002

SIST EN 60835-1-4:2002/A1:2002 is the Slovenian amendment to the IEC/EN methods for measuring equipment used in digital microwave radio transmission systems. It updates Part 1, Section 4 on transmission performance by adding guidance for residual bit-error ratio (RBER), mainly for engineers, test labs, and system suppliers working on terrestrial radio-relay systems and satellite earth stations.

What does SIST EN 60835-1-4:2002/A1:2002 specify?

SIST EN 60835-1-4:2002/A1:2002 specifies an added measurement method for transmission performance, focused on residual bit-error ratio (RBER). It is a narrow amendment to the existing measurement standard, so the main practical change is the new content in clause 3 on additional parameters.

The amendment is organized as follows:

• Foreword and contents
• Clause 3, “Additional parameters”
• New subclause 3.1, “Residual bit-error ratio”
  • 3.1.1 Definition and general considerations
  • 3.1.2 Method of measurement
  • 3.1.3 Presentation of results
  • 3.1.4 Details to be specified

Clause 3 replaces the previous text with the new RBER material. In practice, that means the document gives users one defined additional performance parameter and the measurement approach needed to apply it consistently.

What are the key requirements of SIST EN 60835-1-4:2002/A1:2002?

SIST EN 60835-1-4:2002/A1:2002 centers on how to measure RBER and how to report it. The amendment is practical: it tells users when to measure, how long to measure, what conditions to apply, and what information to record.

1. RBER is the added performance parameter

Clause 3.1 treats residual bit-error ratio (RBER) as an important indicator of system performance. The text explains that RBER includes system-inherent errors, environmental effects, ageing effects, and long-term interference, so it is not just a snapshot of instantaneous BER.

2. Measurements should be made under normal operating conditions

Clause 3.1.1 says the equipment under test should operate under normal conditions. It also says the integration time should be selected using the value given by equation (3-2) in 3.2. In practice, this means the test setup should reflect normal service as closely as possible before drawing conclusions.

3. BER must be measured repeatedly over fixed intervals

Clause 3.1.2 requires repeated BER measurements with a fixed integration time over a long period, with a one-day measurement period given as an appropriate example. RBER is then taken as the highest BER not exceeded in a specified percentage of the integration intervals. That matters because a single good reading is not enough - the result must represent long-term behavior.

4. The amendment gives example measurement durations

The text gives example values of about 24 h total measurement time and about 15 min integration time for systems around 100 Mbit/s and an RBER of 1 x 10-10. These examples help users choose realistic test durations, but the detailed specification still needs to set the actual values for the equipment under test.

5. Different system types need different test conditions

For terrestrial radio-relay systems, the measurements should be carried out with long-term interference if required, in the absence of fading, with reference to IEC 835-2-10. For satellite communication systems, a high carrier-to-noise ratio condition should be applied, with reference to IEC 835-3-12. This distinction matters because the test conditions must match the transmission environment.

6. Results should be recorded carefully

Clause 3.1.2 advises recording BER together with power supply voltage, room temperature, and similar factors. This helps identify error causes and discard invalid measurements caused by environmental effects that would not occur in a real link.

7. The detailed specification must state the test setup

Clause 3.1.4 says the equipment specification should identify the ports to be measured, key interface conditions, receiver input level, test pattern, integration time, percentage of integration intervals, permitted RBER, and total measurement time. In practice, this is the checklist needed to make tests repeatable.

What terms does SIST EN 60835-1-4:2002/A1:2002 define?

SIST EN 60835-1-4:2002/A1:2002 uses a small set of terms that are central to the measurement method.

• Residual bit-error ratio (RBER) - the highest BER not exceeded in a specified percentage of integration intervals.
• Bit-error ratio (BER) - the error ratio measured repeatedly over the test period.
• Integration time - the fixed time used for each BER measurement interval.
• Integration interval - one measurement period within the longer BER test sequence.
• Long-term interference - interference applied in terrestrial radio-relay measurements when required, in the absence of fading.
• Carrier-to-noise ratio - the satellite test condition called for in a high-C/N setup.
• Normal conditions - the operating state used for measuring the equipment under test.

Who uses SIST EN 60835-1-4:2002/A1:2002?

SIST EN 60835-1-4:2002/A1:2002 is used by test engineers, RF and microwave system designers, laboratory staff, and quality managers. It is relevant to manufacturers and integrators of digital microwave radio transmission equipment for terrestrial radio-relay systems and satellite earth stations.

It is especially useful for:

• setting up BER and RBER measurements
• defining factory-test and field-test conditions
• writing equipment specifications
• recording and interpreting transmission-performance data
• comparing results across different links and test sites

What changed in SIST EN 60835-1-4:2002/A1:2002 from the previous edition?

SIST EN 60835-1-4:2002/A1:2002 is Amendment 1 to the transmission-performance section. The amendment adds subclause 3.1, “Residual bit-error ratio,” and replaces the existing text of clause 3, “Additional parameters,” with the new RBER material.

Which standards are used with SIST EN 60835-1-4:2002/A1:2002?

The amendment names two related standards in its measurement guidance:

• IEC 835-2-10 - used for terrestrial radio-relay measurements, especially for long-term interference conditions in the absence of fading.
• IEC 835-3-12 - used for satellite communication system measurements, where a high carrier-to-noise ratio condition is applied.

What does the SIST EN 60835-1-4:2002/A1:2002 document contain?

The document contains the foreword, contents, and the amended clause 3 text for additional parameters. Its technical content is concentrated in subclause 3.1, which gives the definition of RBER, the measurement method, the result presentation, and the items to state in the detailed equipment specification.

It also points users to an equation in 3.2 for choosing integration time, and it gives example test durations and interval lengths for long-term BER measurement. The document is therefore a short amendment with practical measurement guidance rather than a broad general standard.