Circular No. 36/2015/TT-BTTTT Issuing "National Technical Regulations on ADSL2 and ADSL2+ Equipment"

 

CIRCULAR

Issuing the "National Technical Regulation on ADSL2 and ADSL2+ Devices"

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 Regulations on ADSL2 and ADSL2+ devices.policiesEquipment

Article 1. This Circular includes the National Technical Regulation on ADSL2 and ADSL2+ devices (QCVN 98:2015/BTTTT).

Article 2. This Circular takes effect from July 1, 2016.

Article 3. The Director of the Office, Heads of Departments of Science and Technology, Heads of agencies and units under the Ministry of Information and Communications, Directors of Provincial Information and Communications Departments, and relevant organizations and individuals shall be responsible for implementing this Circular./.

 

QCVN 98:2015/BTTTT

NATIONAL TECHNICAL REGULATION ON ADSL2 AND ADSL2+ END EQUIPMENT

National technical regulation on ADSL2 and ADSL2+ transceiverl 2.1. General requirements

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

2.2. Requirements for ADSL end equipment (ATU-R) - type ADSL2

2.3. Requirements for ADSL end equipment (ATU-R) - type ADSL2+

TESTING METHODS

3. Bandwidth capacity

3.1. Total transmission power

3.2. 3.3. DC resistance

3.4. Impedance

3.5. Crosstalk balance

3.6. NEXT attenuation and NEXT distortion

3.7. Upstream transmission rate (or downstream transmission rate)

3.8. PSD mask

Preface

5. RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS

5. RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS

6. IMPLEMENTATION ORGANIZATION

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.

QCVN 98:2015/BTTTT is based on TCVN 8077:2009 "ADSL2 and ADSL2+ transceiver equipment on subscriber lines - Technical requirements".shallTechnical regulations and testing methods comply with Recommendations G.992.3 (04-2009) and G.992.5 (01-2009) of the International Telecommunication Union (ITU) and ETSI TS 101 388 V1.4.1 of the European Telecommunications Standards Institute (ETSI).

QCVN 98:2015/BTTTT was compiled by the Post and Telecommunications Science and Technology Institute, reviewed by the Department of Science and Technology, and issued together with Circular No. 36/2015/TT-BTTTT dated December 23, 2015.

TECHNICAL REGULATION ON END EQUIPMENT

NATIONAL TECHNICAL REGULATION ON ADSL2 AND ADSL2+ END EQUIPMENT

 

NATIONAL TECHNICAL REGULATION ONNational technical regulation on ADSL2 and ADSL2+ transceiverThis standard specifies technical requirements for ADSL end equipment types ADSL2 and ADSL2+ supporting simultaneous voice and data services over a POTS line on a single pair of metallic wires, bonded, frequency-division duplex (FDD).Ề This standard applies to organizations and individuals, both domestic and foreign, engaged in production and business activities involving equipment within the scope of this standard on the territory of Vietnam.ẾQCVN 22:2010/BTTTT: "National technical regulation on electrical safety for telecommunications terminal equipment".TCVN 7189: 2009: Information technology equipment - Radio frequency interference characteristics - Limits and measurement methods.ITU-T G992.1: 1999 Asymmetric digital subscriber line (ADSL).

ITU-T G996.1: 2001 Test procedures for digital subscriber line (DSL) transceivers.lITU-T O.42: 1988 Equipment to measure nonlinear distortion using the four-tone intermodulation method.

Chapter 1. GENERAL PROVISIONS

1.1. Scope of Application

1.4. Definitions

1.2. Applicability

1.4.1. ADSL line

1.3. Referenced Documents

An ADSL line is characterized by a metallic transmission line using analog coding algorithms. These algorithms allow monitoring of digital and analog signal transmission throughout the line. An ADSL line is bounded by two endpoints called line terminations. Line terminations are points where analog coding ends and digital signals are monitored to ensure integrity. The ADSL line is defined between reference points a and b (see Figure 1).

1.4.2. Upstream

Data transmission direction from ATU-R to ATU-C (see Figure 1).

1.4.3. Downstream

Data transmission direction from ATU-C to ATU-R (see Figure 1).

1.4.4. Tip and Ring organize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular.Tip and Ring are two parts of a telephone plug. Tip is the keyed part and Ring is the cylindrical part.

1.4.5. Actual transmission rate

The total data rate transmitted across all channels in one direction.

1.4.6. Transmission state

The state of ATU-C or ATU-R achieved after all initialization and test processes are completed. In this state, data is transmitted over the channels.

Figure 1 - Functional model of ATU

Figure 2 - Reference model for the case of using a splitter at the far end

Figure 3 - Reference model for the case without a far-end splitterANNEX I.A[31]energy

ADSL

Asymmetric digital subscriber line

Asymmetric digital subscriber line

ATU

ADSL transceiver

ADSL Transceiver Unit

ATU-C

ATU at the central office (i.e., the operator's side)No.ATU at the Central office end in ATU-R

Chapter 2. TECHNICAL PROVISIONS

2.2. Requirements for ADSL end equipment (ATU-R) - type ADSL2

ADSL2 and ADSL2+ terminals must:

+ Support WAN IPV6 configuration;

+ Support management protocols SNMP and TR069.

2.1.1 General requirements for ADSL2 terminals

ADSL2 terminals must support operation with non-overlapping frequency bands (that is, frequency division duplexing - FDD).

ADSL2 terminals must support a minimum actual transmission rate of 8 Mbit/s downstream and 800 kbit/s upstream.

ADSL2 terminals must simultaneously support ADSL according to both recommendations G.992.1 and G.992.3.

2.1.2 General requirements for ADSL2+ terminals

ADSL2+ terminals must support ADSL2 terminal requirements and meet the following requirements:

- ADSL2+ terminals must support a minimum actual transmission rate of 16 Mbit/s downstream and 800 kbit/s upstream.

- ADSL2+ terminals must simultaneously support ADSL according to both recommendations G.992.3 and G.992.5.

2.1.3 Electrical safety requirements

Equipment must comply with the provisions of QCVN 22:2010/BTTTT: "National technical regulations on electrical safety for telecommunications terminal equipment".

2.1.4 Electromagnetic compatibility requirements

Equipment must comply with electromagnetic compatibility requirements specified in standard TCVN 7189:2009: "Information technology equipment - Radio frequency interference characteristics - Limits and measurement methods".

2.2 Requirements for ADSL terminal equipment (ATU-R) - type ADSL2No.2.2.1 Functional characteristics of ADSL terminal equipment

2.2.1.1 Upstream frequency spectrum mask of ADSL terminal equipment

The bandwidth is defined as the range from 25.875 to 138 kHz and is the widest band that can be used. The limits defined within this bandwidth also apply to narrower bands used.

Figure 1 shows the limited frequency spectrum mask for the transmitted signal. The low-frequency cutoff band is frequencies below 25.875 kHz and the POTS band, while the high-frequency band is frequencies above 138 kHz.

Frequency Band f (kHz)

Measurement method: according to Section 3.8 of this standard.

2.2.1.2 Response and PSD in the bandwidth

There are three PSD masks for the ADSL terminal equipment transmitted signal, depending on the type of signal being transmitted. The PSD level must not exceed the maximum PSD bandwidth transmission level throughout the entire bandwidth, determined as follows:

+ 1 dB, for signals during channel initialization phase to recovery phase;

- OAM REFPSDus

- + 1 dB, during the remaining initialization phase starting from the test equipment phase; MAXNOMPSDus - PCBus

- + 3.5 dB, in the transmission state. Table 1 - Control parameters of ADSL terminal equipment

Default value

Maximum PSD bandwidth transmission level allowed for non-ideal filter effects is 1 dB.

Measurement method: according to Section 3.1 of this standard.

2.2.1.3 Total transmitted power

There are three different PSD masks for the ADSL terminal equipment transmitted signal, depending on the type of signal being transmitted (see 2.2.1.1). In all cases:

- The total transmitted power in the voice band, measured at the U-R interface, and transmitted to the PSTN network interface must not exceed +15 dBm (measurement method according to ITU-T Rec. G.996.1);

- The total transmitted power across the entire bandwidth must not exceed 0.5 dB more than (MAXNOMATPus - PCBus) to account for implementation discrepancies, and must not exceed 13.0 dBm.

- The total transmitted power in the frequency range from 0 to 11.040 MHz must not exceed 0.8 dB more than (MAXNOMATPus - PCBus) to account for excess transmission power in the bands and implementation discrepancies.

Measurement method: according to Section 3.2 of this standard.

2.2.2 Electrical characteristics

2.2.2.1 Determination of impedance states

The source and load impedances of ADSL terminal equipment must comply with the following provisions, where Zin and Z

are the source and load impedances in the active state; Z_{Provincial People's Committees set specific prices} S-hi_{nh cơ} L-h_{are the source and load impedances in the high-impedance state must be greater than the corresponding impedances Z} S-hi_{. Equipment suppliers must select ZANNEX I.A[31]} greater than Z_{Provincial People's Committees set specific prices} S-hi_{nh cơ} by a specific value._{are the source and load impedances in the high-impedance state must be greater than the corresponding impedances Z} S-hi_{. Equipment suppliers must select ZANNEX I.A[31]} greater than impedances Z_{Provincial People's Committees set specific prices} S-hi_{nh cơ} a defined value.

The following requirements for ADSL terminal equipment allow multiple ADSL terminal devices to be installed on the same pair of wires, although only one ADSL terminal device may be operational at any given time. The parameters and measurement procedures are specified in Section 2.2.2.4.

In each impedance state defined in Table 2, the ADSL terminal equipment transmitter block must meet the ADSL terminal equipment PSD mask specified in Section 2.2.1.1.

Table 2 - Impedance States of ADSL Terminal Equipment

Measurement Method: as specified in Section 3.4 of this standard.

2.2.2.2. Requirements for POTS Voltage and Current

Electrical characteristics must be met when the POTS loop current has a value from 0 mA to 100 mA, and the loop voltage is as follows:

- DC voltage ranging from 0 V to -60 V.

- Ringing signals not exceeding 103 V rms at some frequency within the range of 20 to 30 Hz with a DC component ranging from 0 V to -60 V.

2.2.2.3. Characteristics of ADSL Terminal Equipment in Operational StateANNEX I.A[31]for ADSL terminal equipment in Operational State

2.2.2.3.1. DC Characteristics

The DC input impedance of the ADSL terminal equipment at the U-R interface must be greater than or equal to 5 MW.

NOTE - The most common installation method for filters in splitters is to connect low-pass and high-pass filters in parallel at the U-R port. In this configuration, the high-pass filter will block the DC component using capacitors.

2.2.2.3.2. Characteristics in the Voice Band - Input Impedance

The imaginary component of the input impedance of the ADSL terminal equipment, measured at the U-R interface, in the frequency range from 0 kHz to 4 kHz must have a value equivalent to a capacitor ranging from 20 nF to 34 nF (approximately an impedance from 1.1 kW to 2.0 kW at 4 kHz) for ADSL terminal equipment with integrated splitters having high-pass filters (i.e., DC-blocking capacitors of 120 nF are integrated with ATU-R).

2.2.2.3.3. Characteristics in the ADSL Band - Longitudinal Balance

Longitudinal balance at the U-R interface must be greater than 50 dB in the frequency range from 30 kHz to 11,104 kHz.

If the HPF part of the POTS splitter is integrated into the ATU, longitudinal balance measurements in the specified frequency band need to be performed as shown in Figure 5. When both the LPF and HPF parts of the POTS splitter are integrated into the ATU, longitudinal balance measurements in the specified frequency band must be conducted with the POTS interfaces connected to the ZTR impedance, as illustrated in Figure 6.

Figure 5 - Method for Measuring Longitudinal Balance in the Frequency Range Greater Than 30 kHz (HPF Integrated in ATU)

Figure 6 - Method for Measuring Longitudinal Balance in the Frequency Range Greater Than 30 kHz (HPF and LPF Integrated in ATU)ầThis level of balance needs to be measured both with and without DC bias voltage applied to the device under test, in both operational and idle states. In certain cases, the bias voltage may be higher or lower than a specific value, however, it must be sufficiently large to identify issues related to DC bias voltage balance. The bias voltage must be connected through inductors with good impedance matching. The impedance of these inductors must be ≥ 5,000 jW in the specified frequency range. Additional 200 W resistors must be added to ensure safety. organize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular.Capacitors are included in the measurement circuit to block large DC currents through the 50 W resistors. The impedance of these capacitors must be ≤ |-0.5j W| in the specified frequency range.

The inductors and capacitors in the measurement circuit must be impedance matched so as not to affect the measurement results. When the ratio between the impedance of the inductor and capacitor relative to the 50 W resistor used is high, the impedance matching requirement is lower.

Impedance matching of the inductors is usually easier to achieve by using a two-wire coil on a single core to create a balanced impedance pair. It must be ensured that no resonance occurs in the measurement frequency range. Two inductors (of different sizes) connected in series may be required to meet this requirement when the measurement is a wideband measurement. It is important to ensure that in DC current measurements, saturation does not occur in the inductors. At the same time, it should be noted that some types of capacitors change their value with the applied voltage, generally high-quality plastic types are suitable.

Longitudinal balance (LBal) is determined by the formula:

= input longitudinal voltage (relative to ground at the station or ATU ground);

= measured voltage across the terminating resistor.The measurement circuit must have a higher balance level than the device under test by 20 dB (if the balance level is lower, larger errors will appear in the measurement). To ensure this, the device under test must be replaced with two 50 W resistors and appropriate capacitors as shown in Figure 7. The measurement circuit is properly balanced if the balance level exceeds the required level by 20 dB when the Tip and Ring points are connected in each measurement configuration (Tip with A and Ring with B, and Tip with B and Ring with A) with calibrated impedance. Failure to achieve balance indicates imbalance in the measurement circuit or calibration impedance. An additional resistor must be included in the calibration circuit when the device under test has integrated HPF and LPF as shown in Figure 6. This resistor creates a DC path, thereby preventing the inductors from saturating due to DC currents during testing conditions.Figure 7 - Calibration Circuit

   (1)

Where:

Average loan repayment period is 10 years;₁ Electrical characteristics of ADSL terminal equipment in high impedance state

Average loan repayment period is 10 years;_m High impedance state includes unpowered, non-operational, and non-operational impedance states as specified in Table 1.

NOTE - The electrical characteristics of ADSL terminal equipment in high impedance state apply to a single ADSL terminal equipment also to up to three ADSL terminal equipments in high impedance state connected in parallel and to one ADSL terminal equipment in operational state at a given time.

2.2.2.4.1. DC Characteristics

2.2.2.4Electrical characteristics of ADSL terminal equipment in high impedance state

High impedance state includes unpowered, inactive impedance states and inactive impedance states as specified in Table 1.

NOTE - The electrical characteristics of ADSL terminal equipment in high impedance state apply to a single ADSL terminal equipment and may also be applicable to up to three ADSL terminal equipments in high impedance state connected in parallel and to one ADSL terminal equipment in active state at a given time.

2.2.2.4.1. DC Characteristics

The DC input impedance of the ADSL terminal equipment at the U-R interface must be greater than or equal to 5 MW.

Measurement method: according to Section 3.3 of this standard.

2.2.2.4.2. Characteristics within the voice band

a) Insertion loss

The insertion loss of the ADSL terminal equipment in high impedance state must be less than 0.33 dB at 3.4 kHz, and must be less than 1 dB at 12 kHz and 16 kHz. The insertion loss of three ADSL terminal equipments on the same line must be less than 1 dB at 3.4 kHz, and less than 3 dB at 12 kHz and 16 kHz.

b) Insertion loss distortion

The insertion loss distortion of the ADSL terminal equipment in high impedance state, when compared with the insertion loss at 3.4 kHz, must be less than ±0.33 dB in the frequency range from 200 Hz to 4,000 Hz. The insertion loss distortion of three ADSL terminal equipments in the frequency range from 200 Hz to 4,000 Hz must be less than ±1 dB.

c) Intermodulation distortion

A set of four tones, as specified in ITU-T Recommendation O.42, at a level of -9 dBm, when applied to the ADSL terminal equipment in high impedance state, must generate intermodulation distortion components of the second and third order smaller than the received signal level by at least 80 dB and 85 dB respectively.

Measurement method: according to Section 3.6 of this standard.

2.2.2.4.3. Characteristics within the ADSL band

a) Insertion loss

The insertion loss of the ADSL terminal equipment in high impedance state, for the signal received by the active ATU-C, must be less than 0.33 dB at 100 kHz (a frequency within the active ADSL terminal equipment transmission band).

The insertion loss of the ADSL terminal equipment in high impedance state, for the signal received by the active ADSL terminal equipment, must be less than 0.33 dB at 500 kHz (a frequency within the active ADSL terminal equipment reception band).

b) Insertion loss distortion

The insertion loss distortion of the ADSL terminal equipment in high impedance state for the signal transmitted by the active ADSL terminal equipment must be less than 0.33 dB in the frequency range from 25 kHz to 1,104 kHz.

Measurement method: according to Section 3.6 of this standard.

2.2.2.4.4. Characteristics outside the ADSL band

a) Insertion loss

The insertion loss of the ADSL terminal equipment in high impedance state must be less than 0.33 dB at 5 MHz and at 9 MHz.

b) Insertion loss distortion

The insertion loss distortion of the ADSL terminal equipment must be less than ±0.33 dB in the frequency range from 4 MHz to 10 MHz.

Measurement method: according to Section 3.6 of this standard.

TESTING METHODS

ADSL2+ devices must meet all requirements in Section 2.2 except those specified in Sections 2.3.1 and 2.3.2.

2.3.1. Functional characteristics of the ADSL terminal equipment

2.3.1.1. Frequency spectrum mask of the transmitted signal from the ADSL terminal equipmentDeputy ministers of ministerial-level agencies,The bandwidth is the frequency band from 25.875 kHz to 138 kHz and is the widest band that can be used. The limits defined in this bandwidth also apply to narrower bands used.

Figure 8 shows the frequency spectrum mask limit for the transmitted signal. The low-frequency cutoff band includes frequencies lower than 25.875 kHz and includes the POTS band, while the high-frequency band includes frequencies higher than 138 kHz.

The PSD (dBm/Hz) level

2.3.1.2. Response and PSD within the bandwidthDeputy ministers of ministerial-level agencies,The bandwidth is the frequency band from 25.875 kHz to 138 kHz and is the widest band that can be used. The limits defined in this bandwidth also apply to narrower bands used.

2.2.1.2 Response and PSD in the bandwidth

There are three different PSD masks for the transmitted signal of the ADSL terminal equipment, depending on the type of signal being transmitted. Throughout the entire bandwidth, the transmitted PSD level must not exceed the maximum PSD bandwidth level, determined as follows:amend+ 1 dB during the remaining initialization phase, from the device test run phase;

+ 3.5 dB during the transmission state.

- OAM REFPSDus

- + 1 dB, during the remaining initialization phase starting from the test equipment phase; Table 3 - Control parameters of the ADSL terminal equipment

- + 3.5 dB, in the transmission state. Value

-38 dBm/Hz

- The total transmitted power in the voice band, measured at the U-R interface and transmitted to the POTS interface, must not exceed +15 dBm (measurement method according to ITU-T Rec. G.996.1).

Measurement method: according to Section 3.1 of this standard.

2.2.1.3 Total transmitted power

- The total transmitted power across the entire bandwidth must not exceed 0.5 dB more than (MAXNOMATPus - PCBus) to account for implementation discrepancies and must not exceed 13.0 dBm.

- The total transmitted power in the frequency range from 0 to 12 MHz must not exceed 0.8 dB more than (MAXNOMATPus - PCBus) to account for excess transmission power in the bands and implementation discrepancies.

2.3.2. Electrical characteristics

The requirements in Section 2.2.3 (excluding the longitudinal conversion loss parameter) must be met in the frequency band up to 1,104 kHz in the frequency band up to 2,208 kHz.

The ADSL terminal equipment must have a minimum longitudinal conversion loss (LCL) of 50 dB in the frequency range from 30 kHz to 1,104 kHz.

2.2.2 Electrical characteristics

The ADSL terminal equipment must have a minimum longitudinal conversion loss (LCL) of 40 dB in the frequency range from 1,104 kHz to 2,208 kHz.

3.1. Frequency response

Figure 9 - Configuration for measuring frequency response

Connect the equipment as shown in Figure 9.

3. MEASUREMENT METHODS

Set the spectrum analyzer to receive signals within the bandwidth with a resolution bandwidth of 10 kHz and a video bandwidth of 100 Hz. Resistance R = 100 Ω.amend+ 1 dB during the remaining initialization phase, from the device test run phase;

Evaluate the signal against the transmitted PSD mask.No. allocated

3.2. Total transmitted power

Connect the equipment as shown in Figure 10.

Set the spectrum analyzer to receive signals within the bandwidth with a resolution bandwidth of 1 kHz and a video bandwidth of 100 Hz.

Record the frequency values corresponding to the nominal power reduced by 3 dB. Bandwidth is calculated as the difference between the two frequency values.

Use a filter with a bandwidth equal to the value calculated in the previous step.

Measure and record the total signal power with the final resistance R = 100 Ω.

Figure 10 - Configuration for measuring total transmitted power

Use a filter with a bandwidth equal to the value calculated in the previous step.

Figure 11 - Configuration for measuring DC resistance

Connect the equipment as shown in Figure 11.

Figure 10 - Configuration for measuring total transmitted power

3.4. Impedance

Figure 11 - Configuration for measuring DC resistance

Connect the equipment as shown in Figure 11.

Measure the direct current resistance before powering the device to be measured, when powered but the transmission and reception equipment are not operating, when powered but the transmission equipment is not operating and the reception equipment is operating to detect C-TONES signals, or when powered with the transmission and reception equipment operating and initiating or in a transmission state.

3.5. Crosstalk balance

Connect the equipment as shown in Figure 12.

Measure impedance when powered with the transmission and reception equipment operating and initiating or in a transmission state.

Figure 12 - CConfiguration for measuring impedance

3.6. NEXT attenuation and NEXT distortion

See Section 2.2.2.3.3.

3.7. Upstream transmission rate (or downstream transmission rate)

3.6.1. Insertion loss and insertion loss distortion in the voice band

Connect the equipment as shown in Figure 13.

Measure insertion loss/insertion loss distortion within the frequency range from 0.2 to 4 kHz; at frequencies 12 and 16 kHz before powering the device to be measured, when powered but the transmission and reception equipment are not operating, or when powered but the transmission equipment is not operating and the reception equipment is operating to detect C-TONES signals.

(a) HPF and LPF are integrated

(b) Only HPF is integrated

Figure 13 - Configuration for measuring insertion loss and insertion loss distortion in the voice band

3.6.2. Insertion loss and insertion loss distortion in the ADSL band and outside the ADSL bandamendng tần ADSL và ngoài bamendwithin ADSL frequency band

Connect the equipment as shown in Figure 14.

Measure insertion loss/insertion loss distortion within the frequency range from 25 to 1104 kHz; and from 4 to 10 MHz before powering the device to be measured, when powered but the transmission and reception equipment are not operating, or when powered but the transmission equipment is not operating and the reception equipment is operating to detect C-TONES signals.

(a) HPF and LPF are integrated

(b) Only HPF is integrated

Figure 14 - Configuration for measuring insertion loss and insertion loss distortion in the ADSL band and outside the ADSL bandamendwithin ADSL frequency band and outside ADSL frequency band

3.8. PSD mask

Figure 15 - Configuration for measuring upstream (or downstream) transmission rate and PSD maskên (or downstream data rate) and PSD mask

Connect the equipment as shown in Figure 15.

Set the measurement simulator to the ATU-C simulation mode to measure the upstream rate (or downstream rate).

Preface

Connect the equipment as shown in Figure 15.

Set the measurement simulator to the ATU-C simulation mode to measure the PSD mask.

5. RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS

ADSL terminal devices of types ADSL2 and ADSL2+ within the scope specified in Section 1.1 must comply with the technical requirements stipulated in this Standard.

5. RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS

Organizations and individuals related have the responsibility to implement conformity certification and announce conformity of ADSL terminal devices of types ADSL2 and ADSL2+, and are subject to inspection by state management agencies according to current regulations.

6. IMPLEMENTATION ORGANIZATION

6.1. The Telecommunications Authority and Provincial Departments of Information and Communications are responsible for organizing guidance and implementing management of ADSL terminal devices of types ADSL2 and ADSL2+ according to this Standard.

6.2. In case the provisions set out in this Standard are changed, supplemented, or replaced, they shall be implemented according to the new document./.

 

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.

[1] ITU-T Recommendation G.992.3 (04/2009), Asymmetric digital subscriber line transceivers 2 (ADSL2).

[2] ITU-T Recommendation G.992.5 (01/2009), Asymmetric digital subscriber line transceivers - Extended bandwidth ADSL2 (ADSL2+).