SIST ETS 300 133-6 E2:2003

SIST ETS 300 133-6 E2:2003 is a SIST publication of ETS 300 133-6 Edition 2 from ETSI. It specifies base station conformance requirements for the Enhanced Radio MEssage System (ERMES), with a focus on transmitter radio-frequency behavior, modulation, timing, and test methods. It is written for people who design, test, approve, or buy ERMES base stations.

What does SIST ETS 300 133-6 E2:2003 specify?

SIST ETS 300 133-6 E2:2003 defines the requirements for ERMES base stations and the methods used to verify them. The standard is organized into clauses on scope, normative references, definitions and abbreviations, base station description, RF requirements, and test methods, followed by history.

The scope is limited to base stations operating on ERMES. In practice, that means the document is about the transmitter side of the base station and the checks needed to confirm that it fits the ERMES air interface.

What are the key requirements of SIST ETS 300 133-6 E2:2003?

SIST ETS 300 133-6 E2:2003 requires a base station to consist of one or more transmitters with associated control and timing equipment. It shall use one or more of the sixteen ERMES channels and comply with ETS 300 133-4. For users, this means the base station must be built and configured as an ERMES transmitter, not just a generic radio unit.

If a base station uses the I2 interface, SIST ETS 300 133-6 E2:2003 says it receives paging and control information from a Paging Area Controller (PAC). The control information selects the channel, the paging information carries timing for subsequences and batches, and the base station adds preamble, synchronization, address partition terminators, and message delimiters. It also performs error correction coding and interleaving as specified in ETS 300 133-4, so integration with the network has to support the full paging protocol.

For RF behavior, SIST ETS 300 133-6 E2:2003 applies the general requirements of ETS 300 113 unless the clause gives a specific ERMES rule. It also sets an extreme operating temperature range of -10 °C to +55 °C. In practice, this is the environmental window used when checking transmitter performance.

The modulation is 4-level Pulse Amplitude Modulated/Frequency Modulation (4-PAM/FM), and the symbol transition shaping is tightly controlled. The rise or fall time between successive symbols is 88 µs with a ±2 µs tolerance. That matters because it directly affects occupied spectrum and signal decoding.

The transmitted RF spectrum has to fit a defined mask at the base station output. The standard gives the mask in a table, so compliance is checked against spectrum limits rather than by a single power value. This is the part that keeps emissions inside the expected channel shape.

Frequency accuracy is also specified. The nominal transmission frequency shall stay within ±200 Hz of the centre frequency, and the difference between adjacent symbol frequencies shall be 3 125 Hz ± 15 Hz. For quasi-synchronous networks, the base station should be configurable so that relative offsets below 10 Hz are avoided where coverage overlaps. That reduces interference between nearby transmitters.

The short-term symbol rate shall be 3 125.00 baud with a tolerance of ±1 ppm over periods up to one second. Long-term stability follows ETS 300 133-4. In practice, this is a timing check on the modulator and its frequency reference.

How are these requirements tested?

SIST ETS 300 133-6 E2:2003 includes test methods for modulation, RF spectrum, frequency tolerance, and symbol rate. It defines a general test setup, then gives specific data streams, measurement steps, and instrument settings. This is what a test lab uses to turn the conformance requirements into repeatable measurements.

What terms does SIST ETS 300 133-6 E2:2003 define?

• Base Station (BS) - One or more transmitters plus the associated control and timing equipment.
• I1 interface - The radio interface between the base stations and the paging receivers.
• I2 interface - The interface between the Paging Area Controller (PAC) and the Base Station (BS) for telecommunication and operation and maintenance services.
• Paging Area Controller (PAC) - The functional block that communicates with the Paging Network Controller (PNC) and manages one Paging Area through the I2 interface.
• Paging Network Controller (PNC) - The controller named in the ERMES network structure and used in the PAC definition.
• symbol - Two bits of information, used as the basic unit on the air interface.
• 4-PAM/FM - 4-level Pulse Amplitude Modulated/Frequency Modulation, the modulation format used by the base station.

Who uses SIST ETS 300 133-6 E2:2003?

SIST ETS 300 133-6 E2:2003 is used by ERMES base station manufacturers, radio test laboratories, network planners, and conformity assessment teams. They use it to design the transmitter, check channel and frequency behavior, set up laboratory measurements, and verify that a base station matches the ERMES interface and RF rules. It is also relevant to buyers who need to specify an ERMES base station against a recognized conformance document.

What changed in SIST ETS 300 133-6 E2:2003 from the previous edition?

SIST ETS 300 133-6 E2:2003 is the second edition of ETS 300 133-6. The standard states that it is a revision of ETS 300 133 in consideration of change requests received by RES 4.

Which standards are used with SIST ETS 300 133-6 E2:2003?

• ETS 300 133-3 - Defines the ERMES network aspects and supports the I2 interface description.
• ETS 300 133-4 - Provides the air interface specification, including modulation, coding, interleaving, and long-term symbol-rate rules.
• ETS 300 133-7 - Covers operation and maintenance aspects, which are referenced for I2-related services.
• ETS 300 113 - Supplies general radio equipment characteristics and test conditions that apply unless this part gives a specific ERMES rule.

What does the SIST ETS 300 133-6 E2:2003 document contain?

SIST ETS 300 133-6 E2:2003 contains a general test arrangement, spectrum-analyser settings, and detailed measurement procedures for symbol transition shaping, in-channel RF spectrum, centre frequency, symbol frequencies, and symbol rate. It also gives the repetitive data patterns used to drive the transmitter during tests. The table for the in-channel RF spectrum mask and the figure showing the test setup are the main worked technical aids for laboratory verification.