Circular No. 39/2015/TT-BTTTT Issuing the "National Technical Regulation on Electromagnetic Compatibility for Ground-Based Radio Relay Equipment (TETRA)"

MINISTRY OF INFORMATION AND COMMUNICATION COMMUNICATION ----------	SOCIALIST REPUBLIC OF VIET NAM Independence - Freedom - Happiness ---------------
Number: 39/2015/TT-BTTTT	Hanoi, on 25 December 2015

CIRCULAR

ISSUES THE "NATIONAL TECHNICAL REGULATION ON ELECTROMAGNETIC COMPATIBILITY FOR TERRESTRIAL TRUNKED RADIO (TETRA) EQUIPMENT"

Pursuant to the Law on Standards and Technical Regulations dated June 29, 2006;

Pursuant to the Law on Telecommunications dated November 23, 2009;

WHEREAS, Decree No. 127/2007/NĐ-CP dated August 1, 2007 of the Government detailing and guiding the implementation of certain provisions of the Law on Technical Standards and Regulations;

Based on Decree No. 132/2013/ND-CP dated October 16, 2013 of the Government on the functions, tasks, powers, and organizational structure of the Ministry of Information and Communications;

Pursuant to the proposal of the Director of the Science and Technology Department,

The Minister of Information and Communications issues this Circular to stipulate the national technical regulation on electromagnetic compatibility for terrestrial trunked radio (TETRA) equipment.

Article 1.

Attached to this Circular is the National Technical Regulation on Electromagnetic Compatibility for Terrestrial Trunked Radio (TETRA) Equipment (QCVN 100:2015/BTTTT).

Article 2.

This Circular takes effect from July 1, 2016.

Article 3.

The Heads of the Office, Department of Science and Technology, Heads of agencies and units under the Ministry of Information and Communications, Directors of Provincial Departments of Information and Communications, and related organizations and individuals are responsible for implementing this Circular.

Place of Receipt: - Ministries, agencies equivalent to ministries, and government agencies; - People's Committees and Departments of Information and Communications of provinces and centrally governed cities;itself- Inspectorate General (Ministry of Justice); - News Agency, Government Portal; trNATIONAL TECHNICAL REGULATION ON ELECTROMAGNETIC COMPATIBILITY FOR TERRESTRIAL TRUNKED RADIO (TETRA) EQUIPMENT - Publish, Government Portal;June 2024;o, Government Portal; - Ministry of Information and Communications: Minister and Deputy Ministers; Agencies and units under the Ministry; Electronic Portal of the Ministry; - To be filed: VT, KHCN.

THE MINISTER Nguyen Bac Son

QCVN 100:2015/BTTTT

TECHNICAL REGULATION ON ELECTRONIC INTEROPERABILITY FOR TETRA LAND MOBILE TRUNKING EQUIPMENT

National technical regulation on electromagnetic compatibility for Terrestrial Trunked Radio (TETRA) equipmentlatANNEX I.A[31]on on electromagnetic compatibility for TerrestrialiliTrunked RadioANNEX I.A[31]al o (TETRA) equipmentANNEX I.A[31]Exclusion Bandwidth

2.4.4. Support for Multi PLP

Chapter 1. GENERAL PROVISIONS

1.1. Scope of Application

1.2. Applicability

1.3. Referenced Documents

1.4. Terms and Definitions

1.5. Abbreviations

Chapter 2. TECHNICAL PROVISIONS

2.1. Electromagnetic Compatibility Emission

2.2. Immunity

2.3.1. General Provisions

For the purposes of this standard, test conditions in Appendix A of QCVN 18:2014/BTTTT may be applied when appropriate. This standard supplements additional provisions regarding test conditions for fixed radio transmission equipment and auxiliary equipment in fixed services.

2.3.2. Signal measurement arrangement

2.3.3. 2.4.3. Equipment unable to provide connection

2.3.4. Exclusion band

2.3.5. Narrowband receiver response

Normal modulation check无效 Technical requirements

2.4.1 General

2.4. Evaluationpolicies2.4.2. Testingdevelopment 2.4.3. Equipment that can provide continuous connection 30 ||| 2.4.4. Equipment that cannot provide continuous connection

2.4.6. Evaluation of equipment channel performance with respect to continuous interference applied to receiver of individuals registered in accordance with the law continues to be updated into the information l32 ||| 2.4.6. Evaluation of the quality of equipment providing channels satisfying

2.4.4. Auxiliary Equipment

2.4.5. Equipment classification

impulse interference applied to receiverANNEX I.A[31]

2.5.1. Quality Criteria for Continuous Phenomena applicable to Transmitters (CT) and Receivers (CR)

2.5.1. Quality criteria for continuous interference phenomena applicable to transmitters Sporadic criteria applicable to transmitters

2.5.2. Quality criteria for continuous interference phenomena applicable to transmitters Quality criteria with respect to continuous interference phenomena applicable to receivers

2.5.3. Sporadic criteria applicable to receiversNo.4. RESPONSIBILITIES OF THE MINISTRIES, ORGANIZATIONS AND INDIVIDUALS n accordance with ETSI EN 301 489-18 V1.3.1 (2002-08) of the European Telecommunications Standards Institute (ETSI).

2.5.4. Sporadic criteria applicable to receiversNo.4. RESPONSIBILITIES OF THE MINISTRIES, ORGANIZATIONS AND INDIVIDUALS LAND MOBILE TRUNKING (TETRA) EQUIPMENT

3. 4. RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALSỀ MANAGEMENT

compatibility for Terrestrial Trunked Radio (TETRA) equipmentỔ t ĐẤT (TETRA)Á pment

Chapter 5. ORGANIZATION OF IMPLEMENTATION

QCVN 110:2017/BTTTT was compiled by the Post and Telecommunications Science and Technology Institute, reviewed by the Department of Science and Technology, and promulgated along with Circular No. 24/2017/TT-BTTTT dated October 17, 2017.

Foreword

QCVN 100:2015/BTTTT is developed based on the standard ETSI EN 301 489-18 V1.3.1 (2002-08) of the European Telecommunications Standards Institute (ETSI).rime Minister cthis Technical Regulation:

QCVN 100:2015/BTTTT was compiled by the Institute of Post and Telecommunications Science and Technology, reviewed and approved by the Department of Science and Technology, and issued by the Ministry of Information and Communications pursuant to Circular No. 39/2015/TT-BTTTT dated August 252015 the 12 2015.

NATIONAL TECHNICAL REGULATION ON ELECTROMAGNETIC COMPATIBILITY FOR TERRESTRIAL TRUNKED RADIO (TETRA) EQUIPMENTỀ ELECTROMAGNETIC COMPATIBILITY FOR TETRA EQUIPMENTẾ- Mobile equipment of TETRA radio communication systems.Ế This regulation specifies measurement conditions, quality evaluation criteria, and technical requirements.

National technical regulation on electromagnetic compatibility for Terrestrial Trunked Radio (TETRA) equipmentANNEX I.A[31]organizations, foreign entities engaged in production and business activitiesANNEX I.A[31]Equipment used in connection with receivers or transmitters.

Chapter 1. GENERAL PROVISIONS

1.1. Scope of Application

This regulation specifies the electromagnetic compatibility requirements for TETRA terrestrial trunked radio relay equipment and auxiliary equipment.

This regulation applies to the following TETRA terrestrial trunked radio relay equipment:policies wirelesspoliciesNOTE: An accessory device is considered when:of the Government stipulating functions, tasks, powers, and organizational structure of the Ministry of Home Affairs- The device is used in conjunction with a receiver or transmitter to create additional operational functions and/or control enhancements for the radio communication device (such as extending control to another location or area),

- Mobile telephone sets (MS);

- Base station equipment (BS);

- Mobile terminal - direct mode (DM-MS);ANNEX I.A[31] - Mobile terminal - DW (DM-W);

- Gateway equipment - direct mode (DM-GATE);- Electronic Information Portal- Repeater equipment - direct mode (DM-REP);

- Repeater/gateway equipment - direct mode (DM-REP/GATE);

- Repeater equipment - trunking mode (TMO-REP);

- Mobile equipment of TETRA radio communication systems.

Technical specifications related to operating frequency bands, antenna ports, and emissions from enclosure ports of radio equipment are not within the scope of this regulation. These technical specifications are defined in corresponding product standards regarding efficient spectrum usage.

- The device cannot be used independently to create independent functions of a receiver or transmitter, and

This regulation specifies measurement conditions, quality evaluation criteria, and quality criteria for electromagnetic compatibility for TETRA terrestrial trunked radio relay equipment and combined auxiliary equipment.Deputy ministers of ministerial-level agencies,This technical regulation applies to organizations and individuals in Vietnam and foreign countries engaged in production, business, and exploitation of equipment within the scope of this regulation on Vietnamese territory.y QCVN 18: 2014/BTTTT, National Technical Regulation on Electromagnetic Compatibility for Wireless Telecommunication Equipment. For coal-fired thermal power plants where the enterprise holds 100% of the registered capital and uses 100% of its own capital to invest in the project approved by the competent authority, E is determined as 100%;ETSI EN 301 394-1: "Terrestrial Trunked Radio (TETRA); Conformance testing specification; Part 1: Radio".

- The receiver/transmitter that has the capability to perform certain operations such as transmission and/or reception without the auxiliary device (meaning it is not a necessary sub-component to maintain the basic function of the main device). lETSI EN 300 392-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 2: Air Interface (AI)".

1.2. Applicability

ETSI ETS 300 393-2: "Terrestrial Trunked Radio (TETRA); Packet Data Optimized (PDO); Part 2: Air Interface (AI)". other Deputy DirectorsANNEX I.A[31] ETSI EN 300 396-2: "Terrestrial Trunked Radio (TETRA); Technical requirements for Direct Mode Operation (DMO); Part 2: Radio aspects". Complete and submit a valid registration dossier to the Standing Office of, amended and supplemented by Decree No. 109/2025/NĐ-CP and Decree No. 193/2025/NĐ-CP 1.4.2. Speech-capable equipment various ETSI EN 300 396-5: "Terrestrial Trunked Radio (TETRA); Technical requirements for Direct Mode Operation (DMO); Part 5: Gateway air interface". (equipment which is capable of speech operation) and and 1.4.1. Auxiliary equipment (ancillary equipment) BB 1.1ANNEX I.A[31] Equipment used in conjunction with a receiver or transmitter. )NOTE: An equipment is considered as auxiliary equipment when:

1.3. Referenced Documents

- It is used in combination with a receiver or transmitter to create additional operational functions and/or control functions for the radio communication equipment (such as extending control to another location or area),- It cannot be used independently to create independent usage functions of a receiver or transmitter, and

- The receiver/transmitter connected to it has the ability to perform certain operations such as transmission and/or reception without auxiliary equipment (meaning it is not a sub-unit necessary to maintain the basic function of the main equipment).01.4.2. Speech-capable equipmentP(equipment which is capable of speech operation)PEquipment having or capable of being directly connected to a microphone and/or speaker or headset or having voice signal interfaces.

1.4.3. Non-speech equipment “(non-speech equipment)PEquipment lacking the capability to input or output voice signals available in the equipment or through voice signal interfaces.”.

NOTE: This type of equipment includes data-only devices, including base stations and terminals, and also includes V+D and PDO base stations and non-speech capable DMO repeaters.ANNEX I.A[31]1.4.4. Base station equipmentorganize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular.(base station equipment)

Radio communication and/or auxiliary equipment located at a fixed position and powered directly or indirectly (through the power grid or AC/DC power supply) by the power grid or local DC power network.

1.4.5. Combined equipmentI (combined equipment) “Any equipment capable of performing two or more functions.PNOTE: At least one of these functions falls within the scope of this regulation and has wireless transmission functionality. The result of this combination provides additional control and/or functions for the combined equipment.”.

1.4. Terms and Definitions

1.4.6. Continuous phenomena (Continuous interference) (continuous phenomena)

Equipment having or capable of direct connection to microphones and/or speakers or headsets or having voice signal interfaces.No.1.4.3. Non-speech equipment

(non-speech equipment)

Equipment lacking the ability to input or output voice signals available within the device or through voice signal interfaces.policiesNOTE: This type of equipment includes devices that only operate with data, including base stations and terminal devices, as well as base stations V+D and PDO repeaters without direct speech capabilities.amend1.4.4. Base station equipment For coal-fired thermal power plants where the enterprise holds 100% of the registered capital and uses 100% of its own capital to invest in the project approved by the competent authority, E is determined as 100%;(base station equipment)concerning the classification and determination of state management authority in the field of crop production đdevelopment Radio communication and/or auxiliary equipment located at a fixed position and powered directly or indirectly (i.e., via the power grid or AC/DC power supply) by the power grid or local DC power network."b) In addition to the lists of public services issued according to the provisions of Clause 2, Article 4 of this Decree, specialized agencies under provincial People's Committees shall report to the provincial People's Committee for decision-making on amending, supplementing, or issuing the list of public services funded by the state budget within their jurisdiction and consistent with the local budget capacity within the approved budget by the Provincial People's Assembly, and send it to the Ministry of Finance and relevant ministries and sectors for supervision during implementation." 1.4.5. Combined equipmentto

Any equipment capable of performing two or more functions.

NOTE: At least one of these functions falls within the scope of this regulation and has radio transmission functionality. The result of this combination creates additional control and/or supplementary functions for the combined equipment.June 2024;1.4.6. Continuous Phenomena (Continuous Interference)shall (continuous phenomena)ớApply the TTCI interface defined in Appendix A.2.5 of EN 300 394-1 or the feedback method defined in Appendix D of EN 300 394-1.shall 2.3.2.5. Signal arrangement for combined receiver and transmitterto Follow Section A.2.5 in QCVN 18: 2014/BTTTT.

2.3.3. Exclusion Bandwidth Follow Section A.3 in QCVN 18: 2014/BTTTT.

For combined transceivers and equipment operating in full-duplex mode, both exclusion bandwidths specified in Sections 2.3.3.1 and 2.3.3.2 of this regulation must be applied simultaneously.N ||| declaration of customs import procedures.2.3.3.1. Exclusion Bandwidth for Receiver and Reception Part in Transceiver

Exclusion bandwidth for receiver and reception part in transceiver The frequency band is determined based on the switching range, a frequency band published by the manufacturer:

- The lowest frequency of the exclusion bandwidth equals the lowest frequency obtained from the selected band minus 5% of the center frequency of the switching band or minus 10 MHz;

- The highest frequency of the exclusion bandwidth equals the highest frequency obtained from the selected band plus 5% of the center frequency of the switching band or plus 10 MHz;to The switching band is the largest frequency band in which the receiver can operate without reprogramming or rearrangement.

2.3.3.2. Exclusion Bandwidth for Transmitter The exclusion bandwidth for the transmitter is a frequency band extended on both sides of the transmitter's nominal operating frequency by ±50 kHz.

2.3.4. Narrowband Response of Receiver

Follow Section A.4 in QCVN 18: 2014/BTTTT.

If the manufacturer does not publish the bandwidth of the narrow IF filter, the IF bandwidth value is 25 kHz.development 2.3.5. Normal Modulation Test Signal

The desired input signal of the receiver must be placed at a frequency near the center frequency of the receiver's operating band and modulated by one of the test signals listed below, the transmitter must be set to a frequency near the center frequency of its operating band and modulated by one of the test signals listed below:policies- For speech-capable equipment, the voice traffic channel (TETRA TCH/S) according to ETS 300 395-2 corresponding to a single tone of 1020 Hz with a level 17 dB below the peak level;to - For non-speech DMO or V+D equipment, the TCH/7.2 test signal according to EN 300 392-2 or EN 300 396-2 or EN 300 394-1;policies- For non-speech DMO or V+D equipment, the SCH/F test signal according to EN 300 392-2 or EN 300 396-2 or EN 300 394-1;

- For non-speech PDO equipment, the NBCH test signal according to ETS 300 393-2 or EN 300 394-1; Figure 3 - Calibration Diagram - Interferometric Method

Electromagnetic interference that cannot be classified among known effects on equipment or specific devices.

1.4.7. Enclosure Port (enclosure port)

The physical boundary of the device where the electromagnetic field has radidevelopment ation and influence.

NOTE: In cases where the device has an integrated antenna, this port is not separate from the antenna port.

1.4.8. Integral Antenna (ANNEX I.A[31](integral antenna)

An antenna that cannot be removed during measurement as specified by the manufacturer.development1.4.9. Port

(Port) A specific interface of the device (machine) exposed to an electromagnetic environment.

NOTE: Any connection point on a device used for connecting cables to/from the device is considered a port (see Figure 1).

Figure 1 - Example of PortsNo.Alternating Current, amended and supplemented by Decree No. 109/2025/NĐ-CP and Decree No. 193/2025/NĐ-CPCDN

Coupling/Decoupling Network

1.5. Abbreviations

AC	Coupling/Decoupling Net	Alternating Current
BER	Bit Error Ratio	Bit Error Ratio
Work	Direct Mode Operation	Direct Mode OperationlDWon Month Day YearDual Watch
Dual Watch	ERP	Reference Point for Ear
Ear Reference Point	Equipment Under Test	Equipment Under Test - Electronic Information PortalMER
Message Error Ratio	Message Error Ratio	MRPPReference Point for MouthANNEX I.A[31]Mouth Reference Point
EUT	NBCH	Normal Block Channel Normal Block Channel
- Voltage: from 100 VAC to 240 VAC;	- Voltage frequency: 47.5 Hz to 52 Hz.	Software update
PDO	Packet Data Optimized	Packet Data Optimized
SCH/F	Signal Channel Full Size	Signal Channel Full SizePSPL
Sound Pressure Level	Sound Pressure Level	TCH
Traffic Channel	Traffic Channel	TCH/S
RF	Radio Frequency	Radio Frequency
Speech Traffic Channel	Speech Traffic Channel	TETRAlTerrestrial Trunked RadiolTErrestrial TRunked RAdio
TTCI	TETRA Test Connector Interface	TETRA Test Connector Interface
V+D	Voice plus Data	Voice plus Data
Requirements for emission comply with Section 2.1 of QCVN 18:2014/BTTTT.	Requirements for immunity comply with Section 2.2 of QCVN 18:2014/BTTTT. Additionally, the following requirements are added:	- For the test method of "Immunity in the electromagnetic field frequency band (80 MHz to 1 000 MHz and 1 400 MHz to 2 700 MHz)", the test signal is amplitude modulated by a 1 020 Hz low-frequency sine wave with a modulation depth of 80%. For the transmission part in dual-mode transceivers with non-continuous operation cycles, the frequency step is 10% of the current frequency. Testing must be performed on a surface. The surface facing the interfering signal source should be the surface expected to be most affected. This surface must be recorded in the measurement report.
- For "Immunity to radio frequency, general mode", the test signal is amplitude modulated by a 1 020 Hz low-frequency sine wave with a modulation depth of 80%. For the transmission part in dual-mode transceivers with non-continuous operation cycles, the frequency step is 500 kHz within the frequency range from 150 kHz to 5 MHz and 10% of the current frequency within the frequency range from 5 MHz to 80 MHz.	Follow Section A.1 of QCVN 18:2014/BTTTT. Additional measurement conditions are defined in this standard.	Measurement of the device must be conducted under normal measurement conditions specified in EN 300 394-1.
Follow Section A.2 of QCVN 18:2014/BTTTT.	2.3.2.1. Positioning the measurement signal at the transmitter input - For "Immunity to radio frequency, general mode", the test signal is amplitude modulated by a 1 020 Hz low-frequency sine wave with a modulation depth of 80%. For the transmission part in dual-mode transceivers with non-continuous operation cycles, the frequency step is 500 kHz within the frequency range from 150 kHz to 5 MHz and 10% of the current frequency within the frequency range from 5 MHz to 80 MHz.	Follow Section A.2.1 of QCVN 18:2014/BTTTT. I2.3.2.2. Positioning the measurement signal at the transmitter outputPNOTE: At least one of these functions falls within the scope of this regulation and has wireless transmission functionality. The result of this combination provides additional control and/or functions for the combined equipment.
Follow Section A.2.2 of QCVN 18:2014/BTTTT.	For devices requiring direct mode support, a TETRA transceiver may be part of the measurement system. For V+D and PDO devices, a base station or mobile/portable TETRA device may be part of the measurement system.	2.3.2.3. Positioning the measurement signal at the receiver input

Chapter 2. TECHNICAL PROVISIONS

2.1. Electromagnetic Compatibility Emission

Follow Section A.2.3 of QCVN 18:2014/BTTTT.

2.2. Immunity

For devices requiring direct mode support, a TETRA transceiver may be part of the measurement system. For V+D and PDO devices, a base station or mobile/portable TETRA device may be part of the measurement system.

2.3.2.4. Positioning the measurement signal at the receiver output) measured directly with a pyranometer. Follow Section A.2.4 of QCVN 18:2014/BTTTT.amendApply the TTCI interface defined in Appendix of EN 300 394-1 or the feedback method defined in Appendix D of EN 300 394-1.

2.3.2.5. Positioning the measurement signal for combined receiver and transmitter

2.3.1. General Provisions

For the purposes of this standard, test conditions in Appendix A of QCVN 18:2014/BTTTT may be applied when appropriate. This standard supplements additional provisions regarding test conditions for fixed radio transmission equipment and auxiliary equipment in fixed services.

Follow Section A.2.5 of QCVN 18:2014/BTTTT. k2.3.3. Frequency Band Exclusion

Follow Section A.3 of QCVN 18:2014/BTTTT.

2.3.2. Signal measurement arrangement

For transceivers and devices operating in dual mode, both frequency band exclusions specified in Sections 2.3.3.1 and 2.3.3.2 of this standard must be applied simultaneously.

2.3.3.1. Frequency Band Exclusion for Receiver and Reception Part in TransceiverNo. The frequency band exclusion for the receiver and reception part in the transceiver is a frequency range determined based on the switching range, which is published by the manufacturer:

- The lower frequency of the exclusion band equals the lowest frequency obtained when subtracting 5% of the center frequency of the selected range or 10 MHz from the lowest frequency of the selected range;

- The upper frequency of the exclusion band equals the highest frequency obtained when adding 5% of the center frequency of the switching range or 10 MHz to the highest frequency of the selected range;No. The switching range is the largest frequency range over which the receiver can operate without reprogramming or rearrangement.

2.3.3.2. Frequency Band Exclusion for Transmitter

The frequency band exclusion for the transmitter is a frequency range extended by ±50 kHz on either side of the nominal operating frequency of the transmitter. l2.3.4. Narrow Band Response of Receiver

Follow Section A.4 of QCVN 18:2014/BTTTT.No. If the manufacturer does not publish the bandwidth of the narrow IF filter, the bandwidth of this filter is 25 kHz.

2.3.5. Typical Modulation for Testing

The desired input signal of the receiver must be placed at a frequency close to the center frequency of the operational band of the receiver and modulated by one of the listed measurement signals, while the transmitter must be set to a frequency close to the center frequency of its operational band and modulated by one of the listed measurement signals: - For devices capable of voice operation, the speech traffic channel (TETRA TCH/S) must follow ETS 300 395-2 corresponding to a single tone 1 020 Hz signal with a level 17 dB below the peak level;

- For DMO or non-voice V+D devices, the measurement signal TCH/7.2 must follow EN 300 392-2 or EN 300 396-2 or EN 300 394-1;No. - For DMO or non-voice V+D devices, the measurement signal SCH/F must follow EN 300 392-2 or EN 300 396-2 or EN 300 394-1;

- For non-voice PDO devices, the measurement signal NBCH must follow ETS 300 393-2 or EN 300 394-1;

2.4.6.2. Voice Channel Performance Evaluation Using Distortion MethodANNEX I.A[31] The measurement applies only to speech-capable equipment. Voice channels must be in ready state. C Establish a feedback loop through the TETRA measurement system. The measuring unit and the equipment manufacturer must agree on the desired RF signals to be applied.of the Government stipulating functions, tasks, powers, and organizational structure of the Ministry of Home Affairs- Set the EUT to operate at maximum transmit power;ANNEX I.A[31] - Establish a link between the EUT and the measurement system. In this measurement system, the uplink signal received from the EUT is fed back to the EUT as a downlink signal. The feedback loop in the measurement system must maintain the feedback signal in digital form or in some way so that the feedback signal is not altered.

2.3.2.5. BNo. Signal measurement for receivers and combined transmitter-receivers

Follow Section A.2.5 in QCVN 18: 2014/BTTTT.

2.3.3. Frequency bands to be excludedANNEX I.A[31] Deductible

Follow Section A.3 in QCVN 18: 2014/BTTTT.

For transceivers and devices operating in duplex mode, both frequency bands to be excluded as specified in 2.3.3.1 and 2.3.3.2 of this standard must be applied simultaneously.

2.3.3.1. Excluded frequency band for receivers organize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular.and receiver sections in transceivers

The excluded frequency band for receivers and receiver sections in transceivers is a frequency range determined based on the switching range, which is published by the manufacturer: l- The lowest frequency of the excluded frequency band is equal to the lowest frequency obtained when subtracting 5% of the center frequency of the switching range or subtracting 10 MHz from the lowest frequency of the selected range;development- The highest frequency of the excluded frequency band is equal to the highest frequency obtained when adding 5% of the center frequency of the switching range or adding 10 MHz to the highest frequency of the selected range;

The switching range is the largest frequency range within which the receiver can operate without reprogramming or rearrangement. l2.3.3.2. Excluded frequency band for transmitters

The excluded frequency band for transmitters is a frequency range expanded on both sides of the transmitter's nominal operating frequency by ±50 kHz. Deductible bằng tần số l2.3.4. Narrowband response of receivers

Follow Section A.4 in QCVN 18: 2014/BTTTT. lIf the manufacturer does not publish the bandwidth of the narrow intermediate frequency (IF) filter, this bandwidth has a value of 25 kHz.

2.3.5. Common modulation testầThe desired input signal of the receiver must have a frequency close to the center frequency of the receiver's operating frequency band and modulated with one of the measured signals listed below; the transmitter must operate at a frequency close to the center frequency of its operating frequency band and modulated with one of the measured signals listed below:

- For devices capable of voice operation, the voice channel (TETRA TCH/S) must comply with ETS 300 395-2 corresponding to a single tone signal of 1020 Hz with a level lower than the peak level by 17 dB;in - For DMO or non-voice V+D devices, the TCH/7.2 measured signal must comply with EN 300 392-2 or EN 300 396-2 or EN 300 394-1;

- For DMO or non-voice V+D devices, the SCH/F measured signal must comply with EN 300 392-2 or EN 300 396-2 or EN 300 394-1;

- For non-voice PDO devices, the NBCH measured signal must comply with ETS 300 393-2 or EN 300 394-1;

Figure 3 - Calibration diagram - Interference methodì 2.4.6.2. Voice channel evaluation using the interference method

Measurement applies only to devices capable of voice communication. Voice channels must be in ready mode.

Establish a feedback loop through the communication system for measurement. The testing unit and the device manufacturer must agree on the desired RF signals to be applied.amend- The EUT must be set to operate at the maximum transmission power; l- A connection between the EUT and the measurement system must be established. In this measurement system, the uplink signal received from the EUT is fed back to the EUT as a downlink signal. Feedback in the measurement system must maintain the feedback signal in digital form or in some way that the feedback signal is not altered.

During the interference measurement, the voice channel must maintain its function and not be randomly interrupted due to exposure to electromagnetic compatibility (EMC) phenomena. This measurement may be performed as a separate measurement or incorporated into an interference measurement by adding a supplementary measurement at each measurement point regarding the transmission of a specific audio signal. Specific implementation methods are defined by the testing laboratory.

2.5.3.2. Non-voice measurement criteria

For non-voice devices, quality criteria must meet one of the following cases:

2.5.4. Quality criteria for sudden voltage phenomena applicable to receiversâAt the end of measurements, the EUT must operate as intended, without losing initial functions of the device, while maintaining communication links.

- For devices capable of voice communication, one voice traffic channel (TETRA TCH/S) in accordance with ETS 300 395-2 shall correspond to the silent state;

- For voice and/or data devices connected to auxiliary equipment for data operation or connected to auxiliary equipment capable of direct connection to a data application, measure BER or MER, unless otherwise specified by the manufacturer;national The signal generator (modulator) must generate a continuous data stream or message with data content or message contentNo. or a pseudo-random sequence of 511 bits in accordance with ITU-Tof the Government stipulating functions, tasks, powers, and organizational structure of the Ministry of Home Affairs3. Experts, leading scientists, chief engineers participating in national defense and security industrial activities at key national defense industrial facilities and key security industrial facilities.

The receiver signal generator (demodulator) must provide the result of BER/MER for the continuous data/message stream.ANNEX I.A[31]Follow Section B.1 in QCVN 18: 2014/BTTTT. lFollow Section B.2 in QCVN 18: 2014/BTTTT. C3H6O3.153.

Measure according to Section 2.3 for radio equipment or a combination of radio equipment and auxiliary equipment that allows establishing and maintaining a TCH7.2 or TCH/S channel mode in accordance with EN 300 392-2 or EN 300 394-1.

Normal modulation check

无效 Technical requirements

2.4.1 General

Do not apply Section B.3 in QCVN 18: 2014/BTTTT.

Follow Section B.4 in QCVN 18: 2014/BTTTT.

Follow Section B.5 in QCVN 18: 2014/BTTTT.

2.4.6. Evaluation of the quality of equipment providing voice channelsdevelopment Evaluate voice quality using the cross-talk method as specified in 2.4.6.1 or the echo method as specified in 2.4.6.2.

2.4.6.1. Voice channel evaluation using the cross-talk method

Measurement applies only to devices capable of voice communication. Voice channels must be in ready mode.

2.4.4. Auxiliary Equipment

Establish a communication link using a TETRA system simulation device or a measuring instrument (hereinafter referred to as "measuring system"). The testing unit and the equipment manufacturer must agree on the desired RF signals to be applied.

2.4.5. Equipment classification

The EUT in transmit/receive mode must meet the following conditions:

- Set the EUT to operate at its maximum transmission power;organize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular. - Before measurement, record the reference level of the voice output signal on both uplink and downlink directions of the measuring instrument, see Figure 3. The reference level at the ear reference point (ERP) must be 0 dBPa at 1020 Hz or 5.0 dBPa at the headset for the downlink direction and -5 dBPa at the mouth reference point (MRP) at 1020 Hz or at the microphone for the uplink direction. These defined sound pressure levels must comply with different types of TETRA equipment and other sound measurement arrangements;

- Determine the level of the voice output signal from the downlink voice channel of the EUT at the mobile or portable device's headset by measuring the sound pressure level (SPL), see Figure 1;

- Measure the level of the restored voice output signal from the uplink voice channel of the measuring system. Background noise must be minimized for the microphone. NOTE: In the case of mobile device measurement, ERP is

and MRPamendFigure 2 - Measurement diagram - Cross-talk methodẵNOTE 1: During calibration in the uplink direction, the EUT is present, but during calibration in the downlink direction, the EUT is absent.

NOTE 2: When the EUT has a speaker, the reference level must be 5.0 dBPa at 1020 Hz.

Figure 3 - Calibration diagram - Cross-talk method

2.4.6.2. Voice channel evaluation using the echo method lMeasurement applies only to devices capable of voice communication. Voice channels must be in ready mode.

Establish a feedback loop communication link through the TETRA measuring system. The testing unit and the equipment manufacturer must agree on the desired RF signals to be applied. - Set the EUT to operate at its maximum transmission power;ANNEX I.A[31] - Establish a connection between the EUT and the measuring system. In this measuring system, the uplink signal received from the EUT is fed back to the EUT as a downlink signal. The feedback loop in the measuring system must maintain the feedback signal in digital form or in such a way that the feedback signal does not change.

- Apply a 1020 Hz signal with a level within the dynamic range of the voice channel microphone at the mouth reference point (MRP).

After feedback, the audio signal is recorded at the ear reference point (ERP) using an acoustic transfer device with a non-metallic sound tube. The signal from the acoustic transfer device is sent to an external distortion analyzer.

Minimize background noise for the EUT microphone or the acoustic transfer device at the ear reference point (ERP).nationalThe equipment must meet the minimum quality criteria specified in Section 2.5.1. lThe establishment of the communication link at the start of measurement, maintaining the communication link, and evaluating the recovered signal are used as quality criteria to assess the basic functions of the equipment during and after measurement. are micro

Mobile equipment powered by vehicle batteries must meet the requirements of this standard for mobile equipment used on vehicles.

Mobile or portable equipment powered by AC mains electricity must meet the requirements of this standard for base station equipment, although the measurements are performed on the equipment's input/output ports. Quality criteria must be applied according to the corresponding mobile or portable classification of the equipment.No.If the equipment has special characteristics and the quality criteria specified in the sections below are not suitable, the equipment manufacturer must publish an alternative technical specification regarding the quality level or acceptable degradation. Record this technical specification in the measurement report and equipment description documentation and accompanying equipment documentation. The quality criteria specified by the equipment manufacturer must ensure the same immunity protection level as the criteria specified in the sections below.

2.5.1. Quality criteria for continuous interference phenomena applicable to transmittersEquipment capable of voice communication must meet Section 2.5.1.1.Equipment incapable of voice communication must meet Section 2.5.1.2.ì mứAt the end of the measurement, the EUT must operate as intended without losing control or data functions required to be stored simultaneously with the communication link maintained during the measurement.ần sNo. If the EUT is only a transmitter, it must repeat

When the EUT is a transceiver, the EUT must not unintentionally transmit during the measurement process under any circumstances.

Ground-based radio relay devices (TETRA) and auxiliary devices falling within the scope of regulation as specified in Section 1.1 must comply with technical regulations in this standard.

Organizations and individuals engaged in the production and business of ground-based radio relay devices (TETRA) and auxiliary devices must implement conformity certification, declaration of conformity, and be subject to state management agency inspections according to current regulations.

The Telecommunications Administration and Provincial Departments of Information and Communications are responsible for organizing guidance and implementing management of radio devices in accordance with this standard.ồIn case the provisions stated in this standard are changed, supplemented, or replaced, they shall be implemented according to the new document./.

LIST OF REFERENCED DOCUMENTS

[1] EN 301 489 - 18 V1.3.1 (2002-08): Electromagnetic compatibility and Radio spectrum Matters (ERM); ElectroMagnetic Compatibility (EMC) Standard for radio equipment and services; Part 18: Specific conditions for Terrestrial Trunked Radio (TETRA) equipment. liên kết giữa EUT và hệ thống đo. Trong hệ thống đo này, tín hiệu hướng lên thu được từ EUT được đof the Government stipulating functions, tasks, powers, and organizational structure of the Ministry of Home Affairsu phản hồi về EUT như một tín hiệu hướng xuống. Việc đấu phản hồi trong hệ thống đo phải giữ tín hiệu được đấu phản hồi có dạng số hoặc theo một cách nào để tín hiệu được đấu phản hồi không bị thay đổi.

The 1 020 Hz signal with a level within the dynamic range of the microphone's voice channel must be applied at the mouth reference point (MRP).

After being connected to feedback, the sound signal received at the ear reference point (ERP) should be recorded using a sound converter with a non-metallic acoustic tube., amended and supplemented by Decree No. 109/2025/NĐ-CP and Decree No. 193/2025/NĐ-CPThe sound signal from the sound converter must be sent to an external distortion analyzer.developmentBackground noise must be minimized for the EUT microphone or the sound converter at the ear reference point (ERP).

The device must meet the minimum quality criteria specified in Section 2.5.1., amended and supplemented by Decree No. 109/2025/NĐ-CP and Decree No. 193/2025/NĐ-CPEstablishing communication links at the start of measurement, maintaining communication links, and evaluating recovered signals shall serve as quality criteria for assessing basic functions of the device during and after measurement.

2.5.1. Quality Criteria for Continuous Phenomena applicable to Transmitters (CT) and Receivers (CR)

Mobile devices powered by transport vehicle batteries must comply with the requirements of this standard for mobile devices used on transport vehicles. 2.5.2, 2.5.3, 2.5.4.

Mobile or portable devices powered by AC mains power must comply with the requirements of this standard for base station equipment, even though measurements are conducted on the input/output ports of the device. Quality criteria must be applied according to the corresponding mobile or portable classification of the device. lWhen the device has special characteristics and the quality criteria specified in the following sections are not applicable, the manufacturer must publish an alternative technical specification regarding the quality level or acceptable degradation. This technical specification must be recorded in the measurement report and device description documentation accompanying the device.

The quality criteria defined by the device manufacturer must ensure the same immunity protection level as those specified in the following sections.ệ2.5.1. Quality criteria for continuous interference phenomena apply to transmitters.ANNEX I.A[31] Devices capable of voice communication must comply with Section 2.5.1.1.

Devices incapable of voice communication must comply with Section 2.5.1.2.无效 At the end of the measurement, the EUT must operate as intended without losing control or data functions while maintaining communication links throughout the measurement process.of the Government stipulating functions, tasks, powers, and organizational structure of the Ministry of Home AffairsIf the EUT is solely a transmitter, it must repeat.

Requirements for the voice channel:° During the cross-talk sound measurement, the voice channel must maintain its function and not be randomly interrupted due to exposure to electromagnetic compatibility (EMC) phenomena. This measurement can be performed separately or combined with a cross-talk sound measurement by adding a supplementary measurement of a specific signal transmission function at each measurement point. Specific implementation methods are determined by the testing laboratory. chof the Government stipulating functions, tasks, powers, and organizational structure of the Ministry of Home Affairs2.5.3.2. Non-voice measurement criteriadevelopment For non-voice devices, quality criteria must meet one of the following cases:ANNEX I.A[31] 2.5.4. Quality criteria for transient phenomena apply to receivers.

At the end of the measurements, the EUT must operate as intended, without losing initial functions of the device, while maintaining communication links.

When the EUT is both a transmitter and receiver, the EUT must not emit unexpectedly during the measurement under any circumstances.

Ground-based radio relay equipment (TETRA) and associated auxiliary equipment falling within the scope of regulation specified in Section 1.1 must comply with the technical provisions of this standard.

Organizations and individuals engaged in the production and business of ground-based radio relay equipment (TETRA) and auxiliary equipment must implement conformity certification, declaration of conformity, and be subject to state management authority inspections according to current regulations.

The Telecommunications Administration and Provincial Departments of Information and Communications are responsible for organizing guidance and implementing management of radio equipment in accordance with this standard. lIn case the provisions set forth in this standard are changed, supplemented, or replaced, they shall be implemented according to the new document.

ẩm định cấp, cấp lại giấy chứng nhận đủ điều kiện sản xuất thuốc bảo vệ thực vậtANNEX I.A[31] LIST OF REFERENCED DOCUMENTS lDuring the measurements in the standby mode with the EUT, it must be ensured that there is no unintended transmission.

2.5.1.1. Speech measurement criteria

Depending on the selected measurement method, the EUT must comply with the requirements of the interference method (see 2.5.1.1.1) or the distortion method (see 2.5.1.1.2).

2.5.1.1.1. Requirements for the interference method For details of the interference method, see Section 2.4.6.1. During the immunity testing, the speech input levels uplink and downlink observed must be at least 35 dB lower than the reference level when measured through a sound bandpass filter with a center frequency of 1 kHz and a bandwidth

Vof 200 Hz. lNOTE: When the background noise level is high, the bandwidth of this filter may be reduced to a minimum value of 40 Hz.

Requirements for the speech channel:development During the interference measurement, the speech channel must maintain its function and not be randomly muted due to exposure to electromagnetic compatibility phenomena. This measurement can be performed as a separate measurement or combined within an interference measurement by adding at each measurement point an additional measurement of the transmission function of a defined audio signal. The specific implementation method is determined by the test laboratory.

2.5.1.1.2. Requirements for the distortion method cFor details of the distortion method, see Section 2.4.6.2. The distortion of the audio signal must be measured in each measurement of the process, and the distortion must not exceed 15 % when separated by a first-order bandpass filter with a bandwidth

of 3 dB from 300 Hz to 3 kHz without using a weighted noise filter.ỗ2.5.1.2. Non-speech measurement criteria

For non-speech devices, the quality criteria must meet one of the following cases:

V- The BER of the measured signal must not be greater than 1amend(TCH7.2 for V+D or DMO) during the measurement; or

- The MER (SCH/F for V+D, NBCH for PDO) must not be greater than 20 % or 80 % of the total number of messages transmitted must be received correctly.

2.5.2. Quality criteria applicable to the phenomenon of surge for transmitters

At the end of each measurement, the EUT must operate normally and the user must not notice any signs of communication link loss.0^-2 After all measurements are completed, the EUT must operate as intended without losing any functions required for control or data storage announced by the manufacturer, while maintaining the communication link.

When the EUT is only a transmitter, the measurements must be repeated with the EUT in standby mode to ensure that there is no unintended transmission.

2.5.3. Quality criteria applicable to continuous interference phenomena for receiversANNEX I.A[31] Devices capable of speech must meet Section 2.5.3.1.

Devices incapable of speech must meet Section 2.5.3.2.

At the end of the measurements, the EUT must operate as intended, without losing the initial functions of the device, while maintaining the communication link.amendWhen the EUT is only a transceiver, the measurements must be repeated with the EUT in standby mode to ensure that there is no unintended transmission.ồ2.5.3.1. Speech measurement criteria

For details of the interference method, see Section 2.4.6. During the immunity testing, the speech input levels uplink and downlink observed must be at least 35 dB lower than the reference level when measured through a sound bandpass filter with a center frequency of 1 kHz and a bandwidthANNEX I.A[31] of 200 Hz.

NOTE: When the background noise level is high, the bandwidth of this filter may be reduced to a minimum value of 40 Hz.

Requirements for the speech channel:

During the interference measurement, the speech channel must maintain its function and not be randomly muted due to exposure to electromagnetic compatibility phenomena. This measurement can be performed as a separate measurement or combined within an interference measurement by adding at each measurement point an additional measurement of the transmission function of a defined audio signal. The specific implementation method is determined by the test laboratory.

2.5.3.2. Non-speech measurement criteria

For non-speech devices, the quality criteria must meet one of the following cases:

2.5.4. Quality criteria applicable to the phenomenon of surge for receivers

VAt the end of the measurements, the EUT must operate as intended, without losing the initial functions of the device, while maintaining the communication link. mWhen the EUT is a transceiver, the EUT must not have any unintended transmission during the measurement under any circumstances. Radio trunking ground equipment (TETRA) and associated auxiliary equipment within the scope of regulation in Section 1.1 must comply with the technical regulations in this standard.nationalOrganizations and individuals engaged in the production and business of radio trunking ground equipment (TETRA) and associated auxiliary equipment must implement conformity certification, announce conformity, and be subject to state management agency inspections according to current regulations. lNOTE: When the background noise level is high, the bandwidth of this filter may be reduced to a minimum value of 40 Hz.

The Telecommunications Administration and Provincial Departments of Information and Communications are responsible for organizing guidance and implementing management of radio equipment in accordance with this standard.shall In case the provisions set out in this standard are changed, supplemented, or replaced, they shall be implemented according to the new document./.development LIST OF REFERENCED DOCUMENTSỏ [1] EN 301 489 - 18 V1.3.1 (2002-08): Electromagnetic compatibility and Radio spectrum Matters (ERM); ElectroMagnetic Compatibility (EMC) Standard for radio equipment and services; Part 18: Specific conditions for Terrestrial Trunked Radio (TETRA) equipment.

[1] EN 301 489-18 V1.3.1 (2002-08): Electromagnetic compatibility and Radio spectrum Matters (ERM); ElectroMagnetic Compatibility (EMC) Standard for radio equipment and services; Part 18: Specific conditions for Terrestrial Trunked Radio (TETRA) equipment.

Trong quá trình đo giao thoa âm, kênh thoại phải duy trì chức năng của nó và không bị tắt tipoliciesng ngẫu nhiên vì sự phơi nhiễm đối với hiện tượng EMC. Phép đo này có thể được thực hiện như một phép đo riêng lDepending on the scale of housing, surveying for construction shall be conducted in accordance with the following regulations: hoặc được kết hợp trong một phép đo giao thoa âm bằng cách thêm vào tại mỗi điểm đo một phép đo b, amended and supplemented by Decree No. 109/2025/NĐ-CP and Decree No. 193/2025/NĐ-CP sung về chức năng truyền một tín hiệu âm xác định. Phương pháp thực hiện cụ thể do phòng đo thử qui định.

2.5.3.2. Tiêu chí đo phi thoại

Đối với thiết bị phi thoại, các tiêu chí chất lượng phải đáp ứng một trong các trường hợp sau:

At the end of each measurement, the EUT must operate normally and the user must not notice any signs of communication link loss.0^-2 After all measurements are completed, the EUT must operate as intended without losing any functions required for control or data storage announced by the manufacturer, while maintaining the communication link.

When the EUT is only a transmitter, the measurements must be repeated with the EUT in standby mode to ensure that there is no unintended transmission.

2.5.4. Tiêu chí chất lượng đối với hiện tượng đột biến áp dụng cho máy thu

Devices incapable of speech must meet Section 2.5.3.2.

Khi kết thúc các phép đo, EUT phải hoạt động như dự định, không bị mất các chức namendng ban đầu của thiết bị, đồng thời liên kết truyền thông phải được duy trì.

Khi EUT ch无效 là máy thu phát, EUT không xảy ra việc phát ngoài dự định trong quá trình đo trong mọi trường hợp.

3. MANAGEMENT PROVISIONS

Các thiết bị trung kế vô tuyến mặt đất (TETRA) và thiết bị phụ trnational thuộc phạm vi điều chỉnh quy định tại mục 1.1 phải tuân thủ các quy định kỹ thuật trong Quy chuẩn này.

4. RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS

Các tổ chức, cá nhân có hoạt động sản xuất, kinh doanh các thiết bị trung kế vô tuyến mặt đất (TETRA) và thiết bị phụ trợ phải thực hiện chứng nhận hợp quy, công bố hợp quy và chịu sự kiểm tra của cơ quan quản lý nhà nước theo các quy định hiện hành.

Chapter 5. ORGANIZATION OF IMPLEMENTATION

5.1. Cục Viễn thông và các Sở Thông tin và Truyền thông có trách nhiệm tổ chức hướng dẫn, tridevelopmentn khai quản lý các thiết bị vô tuyến phù hợp với quy chuẩn này.

5.2. Trong trường hợp các quy định nêu tại quy chuẩn này có sự thay đổi, bổ sung hoặc được thay thế thì thực hiện theo quy định tại văn bản mới./.

THƯ MỤC TÀI LIỆU THAM KHẢO

[1] EN 301 489 - 18 V1.3.1 (2002-08): Electromagnetic compatibility and Radio spectrum Matters (ERM); ElectroMagnetic Compatibility (EMC) Standard for radANNEX I.A[31]o equipment and services; Part 18: SpeciPic conditions for Terrestrial Trunked Radio (TETRA) equipment.