SIST ETS 300 133-5/A1 E1:2003

SIST ETS 300 133-5/A1 E1:2003 is a SIST version of ETS 300 133-5/A1 Edition 1 for Paging Systems (PS) and the Enhanced Radio MEssage System (ERMES). It is an amendment to the receiver conformance specification, so it tells manufacturers and test labs how ERMES paging receivers are checked for sensitivity, channel switching, message handling, and related radio performance.

What does SIST ETS 300 133-5/A1 E1:2003 specify?

SIST ETS 300 133-5/A1 E1:2003 updates the ERMES receiver conformance specification in Part 5. The amendment changes the receiver definition, test conditions, sensitivity limits, message checks, and several Annex A, Annex B, and Annex C procedures.

The document is organized as an amendment to the underlying standard ETS 300 133-5. It changes Clause 3, Clause 6.1, Clause 6.2, Clause 7.3.3, Clause 8.1.5, Clause 9.2, and Annexes A, B, and C.

What are the key requirements of SIST ETS 300 133-5/A1 E1:2003?

Sensitivity, offsets, and channel switching

• Clause 6.1 updates the sensitivity figures for the receiver, including average usable sensitivity under normal conditions, sensitivity with transmitter frequency offset, and sensitivity during channel switching. In practice, this sets the performance baseline that a receiver must meet in normal use and when reception is more difficult.
• Clause 6.1 also covers extreme temperature and voltage behavior, plus combined multipath and quasi synchronous transmissions. For a buyer or tester, this means sensitivity must be verified not only at room conditions but also under stressed operating conditions.
• Clause 3 adds the term channel switching, which describes a receiver that changes channels after not finding its initial address in the address partition. This matters because the test must reflect how the receiver behaves when paging traffic moves between channels.

Test setup and message handling

• Clause 6.2 requires sensitivity measurements to be repeated for all six receivers under normal and extreme conditions in the test fixture from Annex A, Clause A.1. That tells the test lab to use the defined fixture and to check repeatability across multiple receivers.
• Clause 6.2 also requires sensitivity measurement on the lowest and highest ERMES frequencies. This matters because receiver performance can vary across the band, so a pass at one frequency does not prove the whole range.
• For channel switching, Clause 6.2 defines a specific test signal: a batch of 139 initial addresses higher than the receiver under test, followed by the test message on the appropriate channel. The batch type, subsequence, and home operator identity are also controlled, so the receiver is tested in a realistic switching case.
• Clause 9.2 adds a check where the receiver is sent the normal message, then the message number is replaced with the dummy value (00000) and sent again. The receiver shall not indicate missing messages, which protects against false loss-of-message indications.

Character sets and optional features

• Clause 7.3.3 allows the pager to include additional character sets as an optional feature, as defined in ETS 300 133-4 [1]. This matters for product design because character support can be extended, but it is not required by the base conformance path.
• Clause C.2 replaces and adds character set tables for alphanumeric paging. These tables define the code patterns used by the receiver display, so implementation and interoperability depend on using the correct set.

Measurement definitions in the annexes

• Annex A updates how adjacent channel selectivity, spurious response immunity, intermodulation immunity, and blocking level are recorded. The practical effect is that the test lab must calculate these results in a consistent way from the wanted and unwanted signal levels.
• Annex B adds the procedure for defining the reference figure in the test fixture. This figure is the baseline used for subsequent measurements, so the test setup has to be established before results can be compared.

What terms does SIST ETS 300 133-5/A1 E1:2003 define?

• Channel switching - A receiver action where it moves to another channel after not finding its initial address in the address partition.
• Initial Address (IA) - The address used to identify the receiver in the paging batch.
• Batch number - The batch grouping used for the paging transmission structure.
• Message acceptance ratio - The acceptance criterion used in the test procedures, including the 80% level in Annex B and Annex A.
• Reference figure - The baseline input level used for measurements in the appropriate test fixture.
• End Of Message (EOM) - The end marker for the message content, referenced in the character set notes.
• Home operator identity - An identity that the channel switching test signal shall not contain.

Who uses SIST ETS 300 133-5/A1 E1:2003?

SIST ETS 300 133-5/A1 E1:2003 is used by receiver manufacturers, paging-system test laboratories, and conformance or certification teams working with ERMES paging equipment. It is also useful for quality managers and buyers who need a clear test basis for accepting paging receivers.

In practice, these users apply it when they design a receiver, set up a test fixture, measure sensitivity, verify channel switching behavior, check message handling, and confirm that the display character sets are implemented as intended.

What changed in SIST ETS 300 133-5/A1 E1:2003 from the previous edition?

SIST ETS 300 133-5/A1 E1:2003 is an amendment to ETS 300 133-5 (1992). The amendment:

• adds the definition of channel switching;
• revises the sensitivity requirements in Clause 6.1;
• changes the sensitivity test conditions in Clause 6.2;
• adds an optional additional character-set statement in Clause 7.3.3;
• clarifies Initial Address wording in Clause 8.1.5;
• adds the missing-message check in Clause 9.2;
• revises Annex A recording methods for selectivity and immunity tests;
• adds the Annex B procedure for the reference figure;
• replaces Table C.3 and adds Tables C.4 and C.5.

Which standards are used with SIST ETS 300 133-5/A1 E1:2003?

• ETS 300 133-4 [1] - Provides the related ERMES material used for the test signal in Clause 6.2 and for optional character sets in Clause 7.3.3.
• ISO 1073 [2] - Provides the character appearance reference mentioned in the notes to the Annex C character-set tables.

What does the SIST ETS 300 133-5/A1 E1:2003 document contain?

The document contains the amendment text itself, including updated clause wording and revised annex material. Annex A sets out the measurement procedures for sensitivity, selectivity, immunity, and blocking tests, while Annex B gives the procedure for establishing the reference figure used in the test fixture.

Annex C contains three character-set tables for alphanumeric paging, including the basic ERMES set and optional sets. The document also includes a short history box and the page-specific amendment notes that show exactly which parts of ETS 300 133-5 were changed.