AS ISO 7240.25:2015 pdf free download.Fire detection and fire alarm systems Part 25: Components using radio transmission paths.
4 System requirements
4.1 General
The requirements of this part of ISO 7240 shall be applied, together with requirements of the relevant part of ISO 7240, where the r.f. transmission path component has the same function as the component covered by that part and when not otherwise specified in this part of ISO 7240.
For example, a component with a r.f. transmission path, having the function of a heat detector shall comply with ISO 7240-5 and a component having the function of a manual call point shall comply with ISO 7240-11.
4.2 Radio frequency transmission paths
4.2.1 Immunity to site attenuation
The manufacturer shall provide means either in the component itself or by the system configuration to ensure that a site attenuation, which can be caused by influences for different reasons on site, shall not affect the r.f. transmission path adversely in a way that communication between components is not possible.
The immunity to site attenuation shall be specified as follows:
a) for r.f. operating frequencies up to 10 MHz: at least 10 dB;
b) for r.f. operating frequencies higher than 10 MHz: as calculated in Annex B.
The manufacturer shall provide the necessary documentation and/or means of evaluation that permits an assessment of the full functionality of the component. If these means are a part of the component, the user shall not be able to interfere with these means (see 8.2.2).
4.2.2 Alarm signal integrity
The components of the system shall use a transmission protocol on the transmission path to ensure that no alarm message is lost (see 8.2.3).
4.2.3 Identification of components
4.2.3.1 Each component using an r.f. transmission path shall be identified by an individual identification code as belonging to one specific fire detection and alarm system.
4.2.3.2 The manufacturer shall provide means to ensure that a component using an r.f. transmission path shall not be accepted by other fire detection and alarm systems (see 8.2.4).
4.2.4 Receiver performance
Unless otherwise specified in mandatory national regulations, the receiver shall meet the requirements given in Table 1.
The manufacturer of the receiver shall provide a test report by a test laboratory to demonstrate that the requirements of this subclause are fulfilled. If the manufacturer cannot provide this evidence, the tests described in 8.2.5 shall be conducted. The manufacturer shall provide the means to carry out the test, e.g. stop frequency hopping.
4.2.5.1.3 Unless otherwise specified in mandatory national regulations, the requirements of 4.2.5 shall apply.
4.2.5.2 Availability of r.f. transmission path in two or more technically similar systems from the same manufacturer
For two or more technically similar systems from the same manufacturer operating within the same radio range the r.f. transmission paths shall not mutually impede one another.
The manufacturer shall specify the means for assessment, which shall be suitable to ensure the availability of all parts of the system in all expected system configurations (see 8.2.6).
4.2.5.3 Availability of the r.f. transmission path in the presence of other band users
Where equipment from other users is operating at the maximum permitted limits (e.g. power, bandwidth and duty cycle) in the same r.f. band or sub-band, r.f. interference shall not prevent signal transmission (see 8.2.7).NOTE The definition in EN 300220-1 applies for establishing the duty cycle.
4.2.5.4 Integrity of the r.f. transmission path
The application of one of the r.f. interference signals specified in 8.2.7 to one of the fire detection and alarm system receivers shall not cause an alarm condition or a fault warning condition at the c.i.e.
4.2.6 Loss of communication
The loss of the ability of the system to transmit a message of any component with an r.f. transmission path to the c.i.e. within periods specified in ISO 7240-2 shall be recognized in less than 300 s and shall be indicated in less than 100 s (see 8.2.8).
4.2.7 Antenna
The antenna or its cable shall be detachable only by opening the enclosure of the component or by using special tools provided by the manufacturer (see 8.2.9).
5 Components requirements
5.1 Compliance
In order to comply with this part of ISO 7240, the components shall meet the requirements of this Clause 5, which shall be verified by visual inspection or engineering assessment, shall be tested in accordance with Clause 8 and shall meet the requirements of the tests.AS ISO 7240.25 pdf download.
AS ISO 7240.25:2015 Components using radio transmission paths
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