SIST ETS 300 133-2:1999/A1:1999

SIST ETS 300 133-2:1999/A1:1999 is the Slovenian standard identical to ETS 300 133-2/A1 Edition 1 from ETSI. It is an amendment to the Paging Systems (PS) / Enhanced Radio MEssage System (ERMES) standard for Part 2, service aspects. The amendment updates message-number handling, service interaction rules, and character-set support for ERMES paging services used by network operators and equipment implementers.

What does SIST ETS 300 133-2:1999/A1:1999 specify?

SIST ETS 300 133-2:1999/A1:1999 specifies changes to the service aspects of ERMES paging, not a complete standalone service standard. It modifies selected clauses of ETS 300 133-2 (1992) and updates how paging messages are handled at the service level.

The amendment focuses on these parts of the base document:

• Clause 2 - normative references
• Subclause 5.3.1.3 - message number handling
• Subclause 5.3.1.3.3 - interaction with other services
• Subclause 6.2.3 - optional character sets
• Clause B.2 - ERMES character set for alphanumeric paging

In practice, this means the document is for people maintaining or implementing ERMES service behavior, especially where message content, activation conditions, and character coding matter.

What are the key requirements of SIST ETS 300 133-2:1999/A1:1999?

SIST ETS 300 133-2:1999/A1:1999 changes the way the service handles message numbers, service activation, and character sets. The most important points are below.

• Clause 2 adds ETS 300 133-4 (1992) as a normative reference. This matters because service behavior now points to the air interface specification for additional character sets and related paging details.
• Subclause 5.3.1.3 allows the message number to be provided by the network operator. In practice, service control can come from the network rather than only from the message originator.
• If a paging message does not include a message number, the message header uses the dummy value 00000. This gives implementers a defined fallback and avoids ambiguity in message coding.
• Subclause 5.3.1.3.3 limits service activation. The service can be activated only when the message number is provided, and it cannot operate when diversion of traffic or temporary barring of incoming traffic is active. In practice, operators must check service state before enabling the feature.
• Subclause 6.2.3 allows optional additional character sets. These are the character sets defined in ETS 300 133-4, so a pager may support more than the base ERMES characters if the implementation chooses.
• Clause B.2 replaces the ERMES character set for alphanumeric paging. Table B.2 defines the set used with character set indicator 00000, which is the coding basis for alphanumeric messages in this amendment.
• The note to Table B.2 restricts DC1 to End Of Message (EOM). It also says displayed characters should approximate ISO 1073 and the relevant national standards, which matters for readable character presentation across devices.

What terms does SIST ETS 300 133-2:1999/A1:1999 define?

• Paging Systems (PS) - the paging service family covered by the standard.
• ERMES - Enhanced Radio MEssage System, the paging radio message system addressed by this part.
• ETSI - European Telecommunications Standards Institute, the body that produced the amendment.
• EOM - End Of Message, the point at which DC1 is permitted.
• DC1 - a control character that, in this amendment, is used only at EOM.
• message header - the part of the paging message that carries the dummy value when no message number is provided.
• message number - the paging message identifier that may be supplied by the network operator.

Who uses SIST ETS 300 133-2:1999/A1:1999?

SIST ETS 300 133-2:1999/A1:1999 is used by paging system operators, network engineers, and equipment manufacturers working with ERMES services. It is also relevant to firmware and software developers who encode paging messages, handle message headers, or support optional character sets.

Quality and test teams use it to verify service behavior in cases such as missing message numbers, service activation limits, and character-set handling. Buyers and technical evaluators can use it to check whether a paging solution supports the ERMES service features they need.

What changed in SIST ETS 300 133-2:1999/A1:1999 from the previous edition?

SIST ETS 300 133-2:1999/A1:1999 is an amendment to ETS 300 133-2 (1992). The foreword says it changes pages 9, 18, 19, 41 and 49 of Edition 1.

The changes stated in the amendment are:

• a new normative reference to ETS 300 133-4 (1992)
• revised wording on who may provide the message number
• a dummy value, 00000, for message headers when no message number is provided
• revised service-activation conditions and service interaction limits
• permission for optional additional character sets from ETS 300 133-4
• replacement of Table B.2 for the ERMES alphanumeric character set

Which standards are used with SIST ETS 300 133-2:1999/A1:1999?

• ETS 300 133-4 (1992) - adds the air interface specification and defines additional character sets used by this amendment.
• ISO 1073 - is cited in the note to Table B.2 as a reference for the approximate appearance of displayed characters.
• ETS 300 133-2 (1992) - is the base standard that this amendment modifies for Part 2, service aspects.

What does the SIST ETS 300 133-2:1999/A1:1999 document contain?

SIST ETS 300 133-2:1999/A1:1999 is a short amendment document rather than a full rewrite of the ERMES service standard. It contains clause-by-clause edits, including added normative references, revised service text, and a replacement character-set table.

The document also includes notes on how the ERMES alphanumeric character set should appear on displays and how DC1 is to be used. In practical terms, it provides the exact changes needed for conformance work, implementation updates, and service testing against the amended ERMES rules.