Version 1: Release Note 28 November 2014



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Originator Counter


Except where specified otherwise in the GBCS, a Remote Party Message shall include an Originator Counter, which shall be octet string of length 8 whose contents shall be set and read as an unsigned 64-bit integer. Responsibility for generating the Originator Counter shall be as shown in Table 4.3.1.2.

Message

Responsibility for generating the Originator Counter

Command

The Known Remote Party identified by the Business Originator ID in the Command.

Response

The Originator Counter shall have the same value as in the corresponding Command.

Alert

The Device generating the Alert.

Table 4.3.1.2: Responsibility for generating the Originator Counter

Where a Device is required to generate an Originator Counter, the Device shall ensure that the value it generates is strictly numerically greater than any previous Originator Counter value it has placed in any previous Message it has generated, and strictly numerically greater than any Supplementary Originator Counter it has placed in any previous Message it has generated.

Where a Remote Party is required to generate an Originator Counter, the Remote Party shall ensure that:


  • the value it generates is strictly numerically greater than any previous Originator Counter value it has provided for use in any previous Command to the Device in question;

  • the 32 least significant bits shall not all have the value 0b0 unless the Command is a Prepayment Top Up Command (see Section 14.3.6 for use of the Originator Counter as the UTRN Counter); and

  • if the Command is a Prepayment Top Up then the 32 least significant bits shall all have the value 0b0.

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