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1a382157d5a45af8b664bdd32c73890e | 104 090 | 3.2 Symbols | Void. |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 3.3 Abbreviations | For the purposes of the present document, the following abbreviations apply: AAC Advanced Audio Coding DAB Digital Audio Broadcasting DUT Device Under Test EEP Equal Error Protection EId Ensemble Identifier ETI Ensemble Transport Interface EWS Emergency Warning System FIB Fast Information Block FIC Fast Information Cha... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 4 EWS Certification Mark | The present document comprises the requirements and test specifications by which radio receivers can qualify to carry an Emergency Warning System (EWS) Certification Mark ("the Mark") for emergency warnings. The purpose of the Mark is to ensure that consumers can readily identify products which are suitable for recepti... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 5.1 Introduction | The minimum requirements for domestic EWS receivers are set out in this clause 5. The minimum requirements for in- vehicle EWS receivers are the subject of clause 6. Domestic products comprise many types of receiver, including portable and larger devices. Domestic products may be mains or battery powered, or both. They... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 5.2 Basic requirements | Domestic products shall comply with the requirements set out in ETSI TS 103 461 [1], clause 5. |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 5.3 Initialization | Domestic products shall provide an initialization mechanism which identifies all receivable EWS ensembles. This shall be carried out as a complete band scan and ensembles carrying FIG 0/15 shall be identified and recorded. As long as at least one EWS ensemble is identified, the initialization mechanism shall invite the... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 5.4 EWS ensembles | The receiver shall provide a facility to keep the tuning memory aligned with EWS signals on-air. Domestic products shall perform a full band scan at regular intervals, whilst the product is not tuned to a specific service. It is recommended to perform a band scan at a minimum once per week. Ensembles carrying FIG 0/15 ... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 5.5 Operational modes | |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 5.5.1 Sleep/monitor duty cycle | Products shall implement a sleep/monitor duty cycle, synchronized to the time provided in FIG 0/10, that shall be operational whenever the product is not outputting audio. The sleep mode shall be according to ETSI TS 104 089 [2], clause 7.2.2.2. The monitor mode shall be fully operational and able to decode the FIC of ... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 5.5.2 Audio mode | Domestic products, when put into operation, shall tune to an EWS ensemble and select a service (this may be the last tuned service, a service allocated to a preset, or some other service that the user has shown previous interest in). Products shall react according to ETSI TS 104 089 [2], clause 7.2.2.4. 6 Minimum requi... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 6.1 Introduction | The minimum requirements for in-vehicle EWS receivers are set out in this clause 6. The minimum requirements for domestic EWS receivers are the subject of clause 5. In-vehicle products are those products designed specifically for use within a vehicle. In-vehicle products comprise many types of receiver, including those... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 6.2 Basic requirements | In-vehicle products shall comply with the requirements set out in ETSI TS 103 461 [1], clause 6. |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 6.3 Tuner capability | In-vehicle products shall have a minimum of two DAB tuners. This allows them to play out audio and at the same time monitor other DAB ensembles for alert signalling and to determine whether a matched alert message is receivable. |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 6.4 Location awareness | In-vehicle products shall have the means to know their geographical location to a precision of at least 100 m. Typically, a GNSS receiver will be suitable. |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 6.5 Operation | In-vehicle products shall behave according to ETSI TS 104 089 [2], clause 7.3.3. ETSI ETSI TS 104 090 V1.1.2 (2025-02) 11 |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 7 Test specification for domestic EWS receivers | |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 7.1 Introduction | Clause 7 provides the test specifications for domestic receivers to comply with EWS requirements. Domestic receivers shall comply with all tests in clause 7. The Device Under Test (DUT) will be exposed to the test streams and the behaviour of the DUT will be verified. The test streams described in annex A are used for ... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 7.2 Basic checks | All EWS products are required to have been tested for compliance against ETSI TS 103 461 [1]. Therefore, the controls, display device and audio device are known to be working properly, and the selection mechanism delivers the right audio stream to the audio output. |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 7.3 Test 1 - Set-up behaviour | • Objective: - To check the behaviour of the DUT as delivered out-of-the-box before the user has entered the receiver location code. • Method: - Set signal generator 1 to an unused DAB channel and the signal level to -50 dBm. - Signal generator 2 remains switched off. R.F. signal generator 2 Baseband encoder 1 R.F. sig... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 7.4 Test 2 - Tuned ensemble alert area matching | • Objective: - To check the behaviour of the DUT with different alert area settings. ETSI ETSI TS 104 090 V1.1.2 (2025-02) 13 • Method: - Turn on the DUT. - Navigate the UI to allow entry of the receiver location code. Set the code to 1255-4467-1352. - Do not alter the settings of signal generator 1. - Setup baseband e... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 7.5 Test 3 - Tuned ensemble alert stages | • Objective: - To check the behaviour of the DUT with different alert stage settings. • Method: - Do not alter the settings of signal generator 1. - Setup baseband encoder 1 and play stream EWS3.eti. Start the timing device. ETSI ETSI TS 104 090 V1.1.2 (2025-02) 14 - Select "Service 1". - Listen to the audio and look a... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 7.6 Test 4 - Other ensemble alerts | • Objective: - To check the behaviour of the DUT for other ensemble alerts. • Method: - Do not alter the settings of signal generator 1. ETSI ETSI TS 104 090 V1.1.2 (2025-02) 15 - Set signal generator 2 to an unused DAB channel and the signal level to -50 dBm. - Setup baseband encoder 2 with stream EWS4.eti and simulta... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 7.7 Test 5 - Sleep mode EWS selection | • Objective: - To check the behaviour of the DUT when selecting suitable ensembles to monitor in sleep mode. • Method: - Do not alter the settings of signal generator 1 or signal generator 2. - Setup baseband encoders 1 and 2 and simultaneously play stream EWS5.eti on encoder 1 and EWS6.eti on encoder 2. Start the timi... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 7.8 Test 6 - Sleep mode alert response | • Objective: - To check the behaviour of the DUT in sleep mode. • Method: - Begin this test immediately at the end of test 5. - Do not alter the settings of signal generator 1 or signal generator 2. - Setup baseband encoder 1 and play stream EWS7.eti. Start the timing device. - Do not turn on the DUT. - Listen to the a... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 7.9 Test 7 - Concurrent alerts | • Objective: - To check the behaviour of the DUT with concurrent alert signalling. • Method: - Set signal generator 1 to a signal level of -50 dBm. - Set signal generator 2 to a signal level of -50 dBm. - Turn on the DUT. - Setup baseband encoders 1 and 2 and simultaneously play stream EWS8.eti on baseband encoder 1 an... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 8 Test specification for in-vehicle EWS receivers | |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 8.1 Introduction | Clause 8 provides the test specifications for in-vehicle receivers to comply with EWS requirements. In-vehicle receivers shall comply with all tests in Clause 8. The testing provides only very basic location testing in a static location. Additional testing of location capability is strongly recommended! The DUT will be... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 8.2 Basic checks | All EWS products are required to have been tested for compliance against ETSI TS 103 461[1]. Therefore, the controls, display device and audio device are known to be working properly, and the selection mechanism delivers the right audio stream to the audio output. |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 8.3 Test 1 - Set-up behaviour | Not required. R.F. signal generator 2 Baseband encoder 1 GNSS simulator R.F. signal generator 1 Baseband encoder 2 R.F. combiner DUT ETSI ETSI TS 104 090 V1.1.2 (2025-02) 21 |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 8.4 Test 2 - Tuned ensemble alert area matching | • Objective: - To check the behaviour of the DUT with different alert area settings. • Method: - Set signal generator 1 to an unused DAB channel and the signal level to -50 dBm. - Signal generator 2 remains switched off. - Turn on the DUT. - Setup baseband encoder 1 and play stream EWS2.eti. Start the timing device. - ... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 8.5 Test 3 - Tuned ensemble alert stages | • Objective: - To check the behaviour of the DUT with different alert stage settings. • Method: - Do not alter the settings of signal generator 1. - Setup baseband encoder 1 and play stream EWS3.eti. Start the timing device. - Select "Service 1". - Listen to the audio and look at the display whilst monitoring the timin... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 8.6 Test 4 - Other ensemble alerts | • Objective: - To check the behaviour of the DUT for other ensemble alerts. • Method: - Do not alter the settings of signal generator 1. - Set signal generator 2 to an unused DAB channel and the signal level to -50 dBm. - Setup baseband encoder 2 with stream EWS4.eti and simultaneously play stream EWS3.eti on baseband ... |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 8.7 Test 5 - Sleep mode EWS selection | Not required. |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 8.8 Test 6 - Sleep mode alert response | Not required. |
1a382157d5a45af8b664bdd32c73890e | 104 090 | 8.9 Test 7 - Concurrent alerts | • Objective: - To check the behaviour of the DUT with concurrent alert signalling. • Method: - Set signal generator 1 to a signal level of -50 dBm. - Set signal generator 2 to a signal level of -50 dBm. - Setup baseband encoders 1 and 2 and simultaneously play stream EWS8.eti on baseband encoder 1 and stream EWS9.eti o... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 1 Scope | The present document defines an Emergency Warning System (EWS) for DAB which features an additional FIG for signalling the identity, status and location of an emergency with the ability for suitably equipped receivers to wake from a low-power sleep mode to provide an audio alert message targeted to the specific geograp... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 2 References | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 2.1 Normative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which a... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 2.2 Informative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks i... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 3 Definition of terms, symbols and abbreviations | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 3.1 Terms | For the purposes of the present document, the following terms apply: alert: information about a situation or incident with the potential of affecting life and well-being of humans ETSI ETSI TS 104 089 V1.1.1 (2024-09) 8 alert area: geographic area to which an alert applies alert audio: short audio element containing in... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 3.2 Symbols | Void. |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 3.3 Abbreviations | For the purposes of the present document, the following abbreviations apply: C/N Current/Next CEI Change Event Indication DAB Digital Audio Broadcasting EId Ensemble Identifier EWS Emergency Warning System FIB Fast Information Block FIC Fast Information Channel FIG Fast Information Group Id Identifier IId Incident Iden... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 4 Overview | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 4.1 Introduction | Emergency warning systems take many forms, originating with the ringing of bells, messages from town criers and activation of warning sirens. In the modern age with extensive communication networks seemingly providing endless connectivity, it is easy to forget that natural disasters often play havoc with infrastructure... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 4.2 System architecture | The DAB EWS consists of one or more DAB ensembles that carry specific signalling that both identifies the ensembles as participating in an EWS and also provides the signalling information to allow receivers to respond. Some ensembles will carry services that provide emergency alert messages, whilst others will carry on... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 4.3 Receiver behaviour | The required receiver behaviour is defined in clause 7 of the present document. Manufacturers are able to check that their products conform to the requirements by performing the tests specified in ETSI TS 104 090 [i.1]. |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 5 EWS ensembles | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 5.1 Baseline requirements | An ensemble that participates in an EWS shall conform to the requirements of ETSI EN 300 401 [1]. It shall signal the date and time using FIG 0/10 in the long form. The date-time information provided in FIG 0/10 shall be accurate, which requires connection to a reliable source of real-time, such as GNSS or NTP. The tim... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 5.2 Information sources | An EWS ensemble that carries alert messages takes responsibility for the content and status settings of alert messages. The source or sources of information that are used to create an alert message and its signalling are not defined by the present document, but the following types of information are typically required:... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 5.3 Receiver considerations | Ideally, all ensembles covering a particular location will participate in the DAB EWS. However, it is recognized that there may be reasons why this does not happen. The services carried in ensembles that do not participate should not be excluded from the receiver's service list, but the user shall be made aware when tu... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6 Alert signalling | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.1 Introduction | The need to signal emergency warning alerts is unpredictable, and it is possible for there to be different incidents occurring in the same geographical location at the same time. However, although these incidents may be simultaneous, only one alert message can be carried in an ensemble at a time: therefore management o... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.2 Source data | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.2.1 Introduction | The data for an EWS may come from many different types of agency. There may be a single national emergency centre, or there may be multiple agencies providing different kinds of data concerning weather events, security events, industrial accidents, etc. Wherever the data come from, they need to include sufficient detai... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.2.2 Incident identification | The ensemble that carries an alert message is responsible for setting the Incident Identifier. It is expected that in some cases, the source data will provide a reliable source of incident identification and the alert provider can use this information to allocate and maintain the Incident Identifier. In other cases, th... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.2.3 Incident stage | When incident identification is supported by the alerting ensemble, users may be able to instruct their receiver to ignore alerts which are signalled as a repeat or update of an ongoing incident. This may be an appropriate action if the user considers that whilst the alert is geographically close to them, they are not ... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.2.4 Alert area | By default, the alert area is the entire coverage area of the ensemble carrying the alert message: in this case no location codes are signalled. However, a specific alert area can be signalled by including location codes. To permit complex alert areas to be signalled, multiple location codes can be provided: the alert ... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.3 Forms of FIG 0/15 | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.3.1 Introduction | FIG 0/15 is used for all aspects of signalling the EWS. The definition of the structure of FIG 0/15 is given in annex E. The P/D flag shall be set according to clause 5.1. An alert message is carried in one of the subchannels of the ensemble. The audio content of the alert message, the timing and the setting of all the... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.3.2 Heartbeat form | In the Heartbeat form, the type 0 field of FIG 0/15 is empty. |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.3.3 Trigger form | In the Trigger form, the type 0 field of FIG 0/15 contains the Id field and the Status field and may contain a number of Location codes. Up to four FIG 0/15 instances of the Trigger form may be used to fully describe the alert area: the content of the Id field and Status field (except for the Last flag) shall be identi... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.3.4 Pre-trigger form | The Pre-trigger form may be used for inter-ensemble communication. It is identical to the Trigger form except for an additional field to define the start second. |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.3.5 Sustain and End form | In the Sustain and End form, the type 0 field of FIG 0/15 contains the Id field only. |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.4 Describing an alert message carried in the ensemble | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.4.1 Introduction | Signalling is used to provide Trigger phase information that allows receivers to evaluate whether the alert message shall be played. Trigger signalling is provided for a minimum of 5 seconds for every alert. Alert providers can decide the point where receivers will stop evaluating whether an alert will be played. At th... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.4.2 Id field | The Id field contains the 2-bit phase field and the 6-bit SubChId field. It is present for all signalling phases. For the "Pre-trigger" phase only, it contains two additional fields, the 2-bit Rfa field and the 6-bit Sec field. The Phase field shall indicate the phase of the alert. The SubChId field shall indicate the ... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.4.3 Status field | The Status field shall only be present when the Phase field is set to "Pre-trigger" or "Trigger". The Status field contains the Last flag, the Stage field and the Incident Identifier (IId) field. The Last flag provides a control function and is not part of the alert information: it shall be set according to clause 6.6.... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.4.4 Location codes | Location codes shall only be present when the Phase field is set to "Pre-trigger" or "Trigger". The alert area is signalled using zero (complete ensemble coverage area) or more location codes, as defined in annex F. Location codes are of variable length. Location codes shall occupy a maximum of 25 bytes in any given FI... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.5 Describing an alert message in other ensembles | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.5.1 Introduction | Other ensembles signalling is used to provide Trigger phase information that allows receivers to evaluate whether the alert message in the other ensemble shall be played. Only Trigger phase signalling is provided for alerts in other ensembles with coverage areas that overlap the coverage area of the ensemble. The infor... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.5.2 Id field | The Id field is set to the Ensemble Identifier (EId) of the ensemble that carries the alert message. ETSI ETSI TS 104 089 V1.1.1 (2024-09) 17 |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.5.3 Status field | The Stage field and the Incident Identifier (IId) shall be set to exactly the same values as provided by the ensemble carrying the alert message. The Last flag provides a control function and shall be set according to clause 6.6. |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.5.4 Location codes | The Location codes shall be set to exactly the same values as provided by the ensemble carrying the alert message. |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.6 Insertion rules for FIG 0/15 | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.6.1 Introduction | The EWS provides a low-power monitoring function for receivers which is synchronized to real time. The insertion rules for FIG 0/15 are designed to allow receivers to evaluate alerts as efficiently as possible. The nominal repetition rate of FIG 0/15 is all information once per second, but due to the variable number of... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.6.2 Alert group is empty | When the alert group is empty it means that there are no alerts that require evaluation by receivers and consequently no Trigger phase signalling to provide (tuned or other ensembles). If there is an ongoing alert message in the ensemble, then Sustain phase signalling shall be provided at a nominal repetition rate of o... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.6.3 Alert group is not empty | When the alert group is not empty it means that there are alerts that require evaluation by receivers and consequently Trigger phase signalling shall be provided (tuned and/or other ensembles). Except when the seconds count is 59, the alert group shall be signalled completely. When the seconds count is 59, alert group ... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 6.7 Signal chain tests | If testing of the EWS is required in a similar way to a fire alarm drill, then the same kind of procedure for planning and informing the public is required so as not to cause unnecessary alarm. In this case an alert with the Stage field set to either Level 1 Start or Level 2 Start shall be used, with the alert message ... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7 Receiver behaviour and response | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.1 Receiver types | It is envisaged that the addition of EWS functionality in a receiver does not reduce the design options manufacturers may use. Therefore, many types of receivers are feasible. The minimum requirements for receivers are the subject of ETSI TS 104 090 [i.1]. Different types of receivers will have different operating mode... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.2 Fixed and portable receivers | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.2.1 Single DAB tuner receivers | Single tuner receivers can only respond to EWS alert messages when they are tuned to an EWS ensemble. This means that if the user selects a DAB service carried on an ensemble that does not participate in the EWS, no alert signalling will be received and so the receiver will be unaware of alerts. This also applies if th... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.2.2 Power modes | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.2.2.1 Introduction | DAB receivers come in many forms - some are DAB only, whilst others include clock functions, FM reception, and other audio playback. |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.2.2.2 Sleep mode | In this mode the receiver is not outputting audio. This is the lowest power mode. ETSI ETSI TS 104 089 V1.1.1 (2024-09) 20 During sleep mode, the receiver shall ensure that a timer operates, synchronized to the time provided by FIG 0/10. The function of the timer is to initiate a transition to monitor mode such that th... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.2.2.3 Monitor mode | In this mode the receiver is not outputting audio. The DAB tuner is tuned to an EWS ensemble and is able to decode the FIC. If FIC reception errors are experienced, the receiver shall not return to sleep mode prematurely: Trigger phase signalling repeats continuously for 5 seconds and during this period the receiver sh... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.2.2.4 Audio mode | In this mode the receiver is outputting audio. The receiver enters audio mode as a response to a user action. In audio mode, the receiver shall as far as possible use the DAB tuner to evaluate FIG 0/15 for matching alert messages. If access to the DAB tuner is not available, or if the user has selected a DAB service wh... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.2.3 Initialization procedure | When the receiver is switched on for the first time (or after a system reset), it shall determine its location, either by requesting the user to input the corresponding DAB location code (see annex A), or by another means. If the only means the receiver has for knowing its location is via a user entered location code, ... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.3 Mobile receivers | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.3.1 Tuner capability | An EWS mobile receiver requires a minimum of two DAB tuners. This allows it to play out audio and at the same time monitor other DAB ensembles for alert signalling and to determine whether a matched alert message is receivable. |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.3.2 Location awareness | A mobile receiver shall have a means to know its geographical location to a precision of at least 100 m. Typically, a GNSS receiver will be suitable. |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.3.3 Audio mode | An in-vehicle receiver shall be active whenever the vehicle is occupied. A mobile receiver that is not an in-vehicle receiver may offer options for availability of the EWS function. The receiver shall monitor the FIC of an EWS ensemble on a regular cycle to evaluate FIG 0/15 for matching alert messages. If the EWS ense... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.4 User settings | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.4.1 Alert message playback control | Receivers may offer user settings to allow users to control the playback of certain alert messages. |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.4.2 Dismiss user controls | A "dismiss repeats" function may be offered which when engaged by the user will prevent the playing of alert messages for the same incident that have the stage Level 1 Repeat or Level 2 Repeat. A "dismiss incident" function may be offered which when engaged by the user will prevent the playing of further alert messages... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.4.3 Monitor mode user controls | A user function may be offered to users to instruct a receiver with sleep mode to evaluate a Level 2 alert as if it was signalled as the corresponding Level 1 alert. This could be linked to the time of day, so that Level 2 alerts signalled during certain hours only are evaluated when the receiver is in monitoring mode.... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.5 Alert matching | |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.5.1 Introduction | Alert matching shall be performed either when the received FIG 0/15 OE flag is 0 and the Phase field is set to "Trigger", or when the OE flag is 1 (all OE signalling is Trigger phase signalling). Various criteria exist to determine if a signalled alert message will be played out: only when all the matching criteria are... |
786b8d411b7b8adcb03f93d3f4b741b4 | 104 089 | 7.5.2 Receivability matching | If the OE flag is set to 0 then the alert message is carried in the tuned ensemble. The Id field identifies the subchannel that carries the audio of the alert message. If the subchannel is present in the FIG 0/1 MCI, receivability matching is positive, if not, it is negative. ETSI ETSI TS 104 089 V1.1.1 (2024-09) 23 NO... |
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