# CS-03, Part VIII — Requirements and Tests Methods for Digital Subscriber Line (xDSL) Terminal Equipment

Issue 9, Amendment 5

Posted on March 3, 2016

Compliance Specification for Terminal Equipment, Terminal Systems, Network Protection Devices, Connection Arrangements and Hearing Aids Compatibility

## 1. Introduction

### 1.1 Scope

This part sets forth the minimum network protection requirements for:

• asymmetrical digital subscriber line (ADSL) terminal equipment (TE) using either carrierless amplitude/phase (CAP) modulation or discrete multi-tone (DMT) technology;
• asymmetrical digital subscriber line 2 (ADSL2) transceivers;
• asymmetrical digital subscriber line 2 plus (ADSL2+) transceivers with extended bandwidth;
• reach extended asymmetrical digital subscriber line (READSL) transceivers;
• high bit rate digital subscriber line 2 (HDSL2) TE using trellis coded pulse amplitude modulation (TC-PAM);
• symmetrical digital subscriber line (SDSL) TE using two binary one quaternary line code (2B1Q);
• single pair high-speed digital subscriber line (SHDSL) TE using TC-PAM;
• 4-wire high bit rate digital subscriber line 2 (HDSL4) TE using TC-PAM;
• very high bit rate digital subscriber line (VDSL) TE using either a single-carrier modulation (QAM) or a multi-carrier modulation (DMT); and
• very high bit rate digital subscriber line 2 (VDSL2) TE using DMT modulation.

ADSL equipment uses one cable pair where transmission of voice band signals and data can occur simultaneously. Asymmetric transmission of data provides a high bit rate downstream (towards the subscriber) and a lower bit rate upstream (towards the central office). Refer to Figure 1.1(a) for the ADSL functional reference model.

ADSL2 equipment uses one cable pair and allows high-speed data transmission between the network operator end (ATU-C) and the customer end (ATU-R). Refer to Figure 1.1(a) for the ADSL2 functional reference model.

HDSL2 is a second generation HDSL loop transmission system that is standardized. The system is designed to transport a 1.544 Mbps payload on a single non-loaded twisted pair at carrier serving area distances. Refer to Figure 1.1(b) for the HDSL2 functional reference model.

2B1Q SDSL has the same symbol rate, baud rate and power spectral density at both the network operator end (STU-C) and the customer end (STU-R). A 2B1Q SDSL system may vary its data rate from 64 kbps to 2320 kbps. Refer to Figure 1.1(b) for the 2B1Q SDSL functional reference model. Typically, 2B1Q SDSL equipment transmits a symmetric signal on a single copper pair.

SHDSL uses TC-PAM on a single copper pair to transmit a symmetric signal with data rates from 192 kbps to 2.312 Mbps. Refer to Figure 1.1(b) for the SHDSL functional reference model.

HDSL4 is a variant of SHDSL, using TC-PAM on two copper pairs (four wires) to transmit an asymmetric signal with a data rate of 768/776 kbps. Refer to Figure 1.1(b) for the HDSL4 functional reference model.

VDSL is a DSL technology designed to support very high-speed data transmission over relatively short twisted-pair loops, which simultaneously support plain old telephone service (POTS). The system supports both symmetric and asymmetric data transmission with payload rates as described in Table 1.1.

VDSL2 is an enhancement to VDSL that supports asymmetric and symmetric transmission at a bidirectional net data rate up to 200 Mbit/s on twisted pairs using a bandwidth of up to 30 MHz.

Table 1.1: VDSL Service Types and Data Rates
Service Type Downstream Data Rate
(Mbps)
Upstream Data Rate
(Mbps)
Asymmetric 22 3
Symmetric 6 6
13 13

Note: Table 1.1 represents the minimum payload rates for VDSL transmission.
The actual equipment may support other rates.

The term xDSL is used in this document to refer generically to any of the digital subscriber line variants.

Description of Figure 1.1(a)

Figure 1.1(a) is a block diagram which describes the terminal equipment functional reference model for ADSL, ADSL2+, READSL, VDSL and VDSL2 equipment. This figure shows the transceiver unit to the central office (TU-C), the transceiver unit to the remote terminal end (TU-R), the connexion to the Public Switched Telephone Network (PSTN) and telephone device, and the interfaces that are referenced in this standard for the transport (downstream or upstream) of voice and/or data.

Note:
PSTN = public switched telephone network
POTS = plain old telephone service

### Figure 1.1(b): TE Functional Reference Model for HDSL2, SDSL, SHDSL and HDSL4

Description of Figure 1.1(b)

Figure 1.1(b) is a block diagram which describes the terminal equipment functional reference model for HDSL2, SDSL, SHDSL, and HDSL4 equipment. This figure shows the transceiver unit to the central office (TU-C), the transceiver unit to the remote terminal end (TU-R) and interfaces that are referenced in this standard for the transport (downstream or upstream) of voice and data.

Note:
TU-C = HDSL2/SDSL/SHDSL/HDSL4 transceiver unit, central office end
TU-R = HDSL2/SDSL/SHDSL/HDSL4 transceiver unit, remote terminal end

top of page

### 1.2 Technical Requirements

Any xDSL terminal equipment connected to the U-R interface shall comply with the technical requirements detailed in tables 1.2(a) and 1.2(b).

Table 1.2(a): Technical Requirements (CS-03, Issue 9, Part I)
Section Technical Requirements HDSL2/SDSL/
SHDSL/HDSL4
2.1 Mechanical Shock * *
2.2 Dielectric Strength * *
2.3.1 Hazardous Voltage Limitations Requirements * *
2.3.7 Connection of Non-registered Equipment to Registered TE or Registered Protective Circuitry * *
2.3.10 Hazards Due to Intentional Paths to Ground * *
2.4.1 Telephone Line Surge — Type A * *
2.4.2 Telephone Line Surge — Type B * *
2.5.1 Power Line Surge *
3.3.2.1 Longitudinal AC Signals (0.1 −4 KHz) *
3.3.2.2 Longitudinal AC Signals (4- 12 KHz) *
3.6 Transverse Balance *
3.7.1 Metallic and Longitudinal DC Resistance (Loop-start Interface) *
3.7.2 DC Current during Ringing (Loop-start and Ground-start Interface) *
3.7.3 Metallic and Longitudinal Impedance during Ringing (Loop-start and Ground-start Interfaces) *

Note: The asterisk (*) indicates that the TE must comply with the listed technical requirements.

Table 1.2(b): Technical Requirements (CS-03, Issue 9, Part VIII)
Section Technical Requirements
3.2 Transmitted Spectral Response
3.3 Total Signal Power
3.4 Transverse Balance
3.5 Longitudinal Output Voltage

### 1.3 Sequence of Equipment Testing

The tests related to the technical requirements listed in Section 1.2 shall be performed in the following order:

1. Part VIII, Section 1.4 Connecting Arrangements
2. Part VIII, Section 1.5 Operational Check
3. Part I, Section 2.2 Dielectric Strength
4. Part I, Section 2.3 Hazardous Voltage Limitations (as applicable)
5. Part I, Section 3. Network Protection Requirements and Tests
6. Part VIII, Section 3. Network Protection Requirements and Test Methods
7. Part I, Section 2.1 Mechanical Shock
8. Part I, Section 2.4.2 Surge Voltage — Type B
9. Part I, Section 1.5 Operational Check
10. Part I, Section 2.2 Dielectric Strength
11. Part I, Section 3. Network Protection Requirements and Tests
12. Part VIII, Section 3. Network Protection Requirements and Test Methods
13. Part I, Section 2.3 Hazardous Voltage Limitations (as applicable)
14. Part I, Section 2.4.1 Surge Voltage — Type A
15. Part I, Section 2.5 Power Line Surge
16. Part I, Section 1.5 Operational Check
17. Part I, Section 2.2 Dielectric Strength
18. Part I, Section 3. Network Protection Requirements and Tests
19. Part VIII, Section 3. Network Protection Requirements and Test Methods
20. Part I, Section 2.3 Hazardous Voltage Limitations (as applicable)

### 1.4 Connecting Arrangements

Cords and plugs of xDSL TE intended for direct electrical connection to the public switched telephone network shall comply with CS-03, Part III, Acceptable Methods of Connection for Single Line and Multi-Line Terminal Equipment.

### 1.5 Operational Check

When the operational checks are performed before the application of electrical stress, the TE shall be fully operational, in accordance with the manufacturer’s operating instructions, for those features necessary to allow demonstration of compliance with all applicable requirements of Part I, Section 3. When the operational checks are repeated after the electrical stress of Part I, Section 2, it is permissible that the TE be partially or fully inoperable.

top of page

## 2. Electrical and Mechanical Stresses

The technical requirements and methods of application for electrical and mechanical stresses are given in Part I, Section 2.

top of page

## 3. Network Protection Requirements and Test Methods

Applicable network protection requirements of Section 3 of Part I must be met for any terminal equipment under the scope of this document. The technical requirements for xDSL terminal equipment are specified in Table 1.2(a).

### 3.1 Laboratory Environment

All tests used to determine compliance of TE with these requirements shall be conducted in a laboratory environment at normal room temperature and humidity.

### 3.2 Transmitted Spectral Response

#### 3.2.1 Requirements

##### 3.2.1.1 Power Spectral Density at the U-R Interface for ADSL

The power spectral density (PSD) of the signal transmitted over the ADSL upstream channel (ATU-R output) shall not exceed the PSD mask in Figure 3.2.1.1. The numerical values for the mask are provided in Table 3.2.1.1.

Frequency Band
(kHz)
PSD (dBm/Hz) Across 100 Ω
Frequency Band (kHz) PSD (dBm/Hz) across 100 Ω
0.2 < ƒ ≤ 4 −97.5
4 < ƒ ≤ 25.875 −92.5 + 21.5 × log 2(ƒ/4)
25.875 < ƒ ≤ 138 −34.5
138 < ƒ ≤ 307 −34.5 − 48 × log2(ƒ/138)
307 < ƒ ≤ 1221 −90
1221 < ƒ ≤ 1630 −90 peak, with max power in the [ƒ, ƒ + 1 MHz] window of
(−90 − 48 × log2(ƒ/1221) + 60) dBm
1630 < ƒ ≤ 30000 −90 peak, with max power in the [ƒ, ƒ + 1 MHz] window of −50 dBm

Note 1: The breakpoint frequencies and PSD values are exact.

Note 2: Above 25.875 kHz, the peak PSD shall be measured with a 10 kHz resolution bandwidth. Below 25.875 kHz, the peak PSD shall be measured with a 100 Hz resolution bandwidth.

Note 3: The power in a 1 MHz sliding window is measured in a 1 MHz bandwidth, starting at the measurement frequency.

Description of Figure 3.2.1.1

Figure 3.2.1.1 shows the Power Spectral Density (PSD) mask of the signal transmitted over the ADSL upstream channel. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 KHz and 30000 KHz. Table 3.2.1.1 provides the numerical values for the mask.

top of page

##### 3.2.1.2 Power Spectral Density at the U-R Interface for ADSL2
Frequency Band
(kHz)
PSD (dBm/Hz) Across 100 Ω
Frequency Band (kHz) PSD (dBm/Hz) Across 100 Ω
0.2 < ƒ ≤ 1.5 −46.5
1.5 < ƒ ≤ 3 −34.5 + 12 × log2(ƒ/3)
3 < ƒ ≤ 138 −34.5
138 < ƒ ≤ 307 −34.5 − 48 × log2(ƒ/138)
307 < ƒ ≤ 1221 −90 peak, with max power in the [ƒ, ƒ + 100 kHz] window of −42.5 dBm
1221 < ƒ ≤ 1630 −90 peak, with max power in the [ƒ, ƒ + 1 MHz] window of
(−90 − 48 x log2(ƒ/1221) + 60) dBm
1630 < ƒ ≤ 30000 −90 peak, with max power in the [ƒ, ƒ + 1 MHz] window of −50 dBm

Note 1: The breakpoint frequencies and PSD values are exact.

Note 2: Above 3 kHz, the peak PSD shall be measured with a 10 kHz resolution bandwidth. Below 3 kHz, the peak PSD shall be measured with a 100 Hz resolution bandwidth.

Note 3: The power in a 1 MHz sliding window is measured in a 1 MHz bandwidth, starting at the measurement frequency.

### Figure 3.2.1.2: ATU-R Upstream Transmission PSD Mask for ADSL2 All-Digital Mode

Frequency (kHz)
Description of Figure 3.2.1.2

Figure 3.2.1.2 shows the Power Spectral Density (PSD) mask of the signal transmitted over the ADSL2 upstream channel All Digital Mode. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 KHz and 30000 KHz. The numerical values for the mask are provided in Table 3.2.1.2.

top of page

##### 3.2.1.3 Power Spectral Density at the U-R Interface for ADSL2 All-Digital Mode Spectral Compatibility with ISDN
Frequency Band
(kHz)
PSD (dBm/Hz) Across 100 Ω
Frequency Band (kHz) PSD (dBm/Hz) Across 100 Ω
0.2 < ƒ ≤ 1.5 −46.5
1.5 < ƒ ≤ 3 −46.5 + (inband peak PSD + 46.5) × log 2(ƒ/1.5)
3 < ƒ ≤ ƒ1 inband peak PSD
ƒ1 < ƒ ≤ ƒ2 inband peak PSD − 48 log2(ƒ/ƒ1)
ƒ2 < ƒ ≤ 1221 −90
1221 < ƒ ≤ 1630 −90 peak, with max power in the [ƒ,ƒ + 1 MHz] window of
(−30 − 48 x log2(ƒ/1221)) dBm
1630 < ƒ ≤ 30000 −90 peak, with max power in the [ƒ,ƒ + 1 MHz] window of −50 dBm

Note 1: The breakpoint frequencies and PSD values are exact.

Note 2: Above 3 kHz, the peak PSD shall be measured with a 10 kHz resolution bandwidth.

Note 3: The power in a 1 MHz sliding window is measured in a 1 MHz bandwidth, starting at the measurement frequency.

Designator Inband peak PSD
(dBm/Hz)
Frequency
ƒ1 (kHz)
Frequency ƒ2
(kHz)
ADLU − 32 −34.5 138 307
ADLU − 36 −35 155.25 343
ADLU − 40 −35.5 172.5 379
ADLU − 44 −35.9 189.75 415
ADLU − 48 −36.3 207 450
ADLU − 52 −36.6 224.25 485
ADLU − 56 −36.9 241.5 520
ADLU − 60 −37.2 258.75 554
ADLU − 64 −37.5 276 589

### Figure 3.2.1.3(a): ATU-R Upstream Transmission PSD Mask for ADSL2 All-Digital Mode

Description of Figure 3.2.1.3(a)

Figure 3.2.1.3(a) shows the Power Spectral Density (PSD) mask of the signal transmitted over the ADSL2 upstream channel all digital mode spectral compatibility with ISDN. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 KHz and 30000 KHz. The numerical values for the mask are provided in Table 3.2.1.3(a).

### Figure 3.2.1.3(b): ATU-R Upstream Transmission PSD Mask for ADSL2 All-Digital Mode

Description of Figure 3.2.1.3(b)

Figure 3.2.1.3(b) shows the Power Spectral Density (PSD) designator for ADSL2 upstream channel all digital mode spectral compatibility with ISDN. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 KHz and 30000 KHz. The numerical values for the mask are provided in Table 3.2.1.3(b).

top of page

##### 3.2.1.4 Power Spectral Density at the U-R Interface for ADSL2 READSL

The PSD of the signal transmitted over the ADSL2 READSL upstream channel (ATU-R output) shall comply with either of the following PSD masks: Mask 1 given in Figure 3.2.1.4(a) or Mask 2 given in Figure 3.2.1.4(b). Table 3.2.1.4(a) provides the numerical values for Mask 1, and Table 3.2.1.4(b) provides the numerical values for Mask 2.

Table 3.2.1.4(a): ATU-R PSD Mask 1 Definition
Frequency Band
(kHz)
PSD (dBm/Hz) Across 100 Ω
0.2 < ƒ ≤ 4 −97.5, with max power in the 0−4 kHz band of +15 dBm
4 < ƒ ≤ 25.875 −92.5 + 22.13 x log2(ƒ/4)
25.875 < ƒ ≤ 103.5 −32.9
103.5 < ƒ ≤ 686 max{−32.9 − 72 x log2 (ƒ/103.5), 10 x log10[0.05683 x (ƒx103)−1.5]}
686 < ƒ ≤ 1411 −100
1411 < ƒ ≤ 1630 −100 peak, with max power in the [ƒ, ƒ + 1 MHz] window of
(−110 − 48 x log2(ƒ/1411) + 60) dBm
1630 < ƒ ≤ 5275 −100 peak, with max power in the [ƒ, ƒ + 1 MHz] window of
(−110 − 1.18 x log2(ƒ/1630) + 60) dBm
5275 < ƒ ≤ 30000 −100 peak, with max power in the [ƒ, ƒ + 1 MHz] window of −52 dBm
Table 3.2.1.4(b): ATU-R PSD Mask 2 Definition
Frequency Band
(kHz)
PSD (dBm/Hz) Across 100 Ω
0.2 < ƒ ≤ 4 −97.5, with max power in the 0−4 kHz band of +15 dBm
4 < ƒ ≤ 25.875 −92.5 + 23.43 x log2(ƒ/4)
25.875 < ƒ ≤ 60.375 −29.4
60.375 < ƒ ≤ 686 max{−29.4 − 72 x log2 (ƒ/60.375), 10 x log10[0.05683 x (ƒx103)−1.5]}
686 < ƒ ≤ 1411 −100
1411 < ƒ ≤ 1630 −100 peak, with max power in the [f, f + 1 MHz] window of
(−110 − 48 x log2(ƒ/1411) + 60) dBm
1630 < ƒ ≤ 5275 −100 peak, with max power in the [ƒ, ƒ + 1 MHz] window of
(−110 − 1.18 x log2(ƒ/1630) + 60) dBm
5275 < ƒ ≤ 30000 −100 peak, with max power in the [ƒ, ƒ + 1 MHz] window of −52 dBm

Description of Figure 3.2.1.4(a)

Figure 3.2.1.4(a) shows the Power Spectral Density (PSD) Mask 1 of the signal transmitted over the ADSL2 READSL upstream channel. The PSD for ADSL2 READSL shall comply with either Mask 1 given in Figure 3.2.1.4(a) or Mask 2 given in Figure 3.2.1.4(b). Figure 3.2.1.4(a) shows the PSD values in dBm/Hz in a band of frequencies between 0 KHz and 30000 KHz. The numerical values for Mask 1 are provided in Table 3.2.1.4(a).

Note 1: The breakpoint frequencies and PSD values are exact.

Note 2: Above 25.875 kHz, the peak PSD shall be measured with a 10 kHz resolution bandwidth. Below 25.875 kHz, the peak PSD shall be measured with a 100 Hz resolution bandwidth.

Note 3: The power in a 1 MHz sliding window is measured in a 1 MHz bandwidth, starting at the measurement frequency.

Description of Figure 3.2.1.4(b)

Figure 3.2.1.4(b) shows the Power Spectral Density (PSD) Mask 2 of the signal transmitted over the ADSL2 READSL upstream channel. The PSD for ADSL2 READSL shall comply with either Mask 1 given in Figure 3.2.1.4(a) or Mask 2 given in Figure 3.2.1.4(b). Figure 3.2.1.4(b) shows the PSD values in dBm/Hz in a band of frequencies between 0 KHz and 30000 KHz. The numerical values for Mask 2 are provided in Table 3.2.1.4(b).

Note 1: The breakpoint frequencies and PSD values are exact.

Note 2: Above 25.875 kHz, the peak PSD shall be measured with a 10 kHz resolution bandwidth. Below 25.875 kHz, the peak PSD shall be measured with a 100 Hz resolution bandwidth.

Note 3: The power in a 1 MHz sliding window is measured in a 1 MHz bandwidth, starting at the measurement frequency.

top of page

##### 3.2.1.5 Power Spectral Density at the U-R Interface for ADSL2 With Extended Upstream Over POTS
Table 3.2.1.5(a): ATU-R PSD Mask Definition (ADSL2 With Extended Upstream Over POTS)
Frequency (kHz) PSD (dBm/Hz) Across 100 Ω
0.2 −97.5
4 −97.5
4 −92.5
25.875 inband peak PSD
ƒ1 inband peak PSD
ƒint PSDint
686 −100
1411 −100 with a 1 MHz measurement bandwidth
1630 −110 with a 1 MHz measurement bandwidth
5275 −100 with a 10 kHz measurement bandwidth and −112 with a 1 MHz measurement bandwidth
30000 −100 with a 10 kHz measurement bandwidth and −112 with a 1 MHz measurement bandwidth

Note 1: The breakpoint frequencies and PSD values are exact.

Note 2: Above 25.875 kHz, the peak PSD shall be measured with a 10 kHz resolution bandwidth.

Note 3: The power in a 1 MHz sliding window is measured in a 1 MHz bandwidth, starting at the measurement frequency.

Table 3.2.1.5(b): ATU-R Inband Peak PSD Mask Designator (ADSL2 With Extended Upstream Over POTS)
Designator Inband peak PSD
(dBm/Hz)
Frequency ƒ1
(kHz)
Frequency ƒint
(kHz)
Intercept PSD
(dBm/Hz)
ADLU − 32 −34.5 138 242.92 −93.2
ADLU − 36 −35 155.25 274 −94
ADLU − 40 −35.5 172.5 305.16 −94.7
ADLU − 44 −35.9 189.75 336.4 −95.4
ADLU − 48 −36.3 207 367.69 −95.9
ADLU − 52 −36.6 224.25 399.04 −96.5
ADLU − 56 −36.9 241.5 430.45 −97
ADLU − 60 −37.2 258.75 461.9 −97.4
ADLU − 64 −37.5 276 493.41 −97.9

### Figure 3.2.1.5(a): ATU-R Upstream Transmission PSD Mask Designator for ADSL2 With Extended Upstream Over POTS

Description of Figure 3.2.1.5(a)

Figure 3.2.1.5(a) shows the Power Spectral Density (PSD) mask of the signal transmitted over the ADSL2 Extended Upstream above plain old telephone service (POTS). This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30000 kHz. The numerical values for the mask are provided in Table 3.2.1.5(a).

### Figure 3.2.1.5(b): ATU-R Upstream Transmission PSD Mask Designator for ADSL2 With Extended Upstream Over POTS

Description of Figure 3.2.1.5(b)

Figure 3.2.1.5(b) shows the Power Spectral Density (PSD) mask designator for ADSL2 Extended Upstream above plain old telephone service (POTS). This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30000 kHz. The numerical values for the mask are provided in Table 3.2.1.5(b).

top of page

##### 3.2.1.6 Power Spectral Density at the U-R Interface for ADSL2+ All-Digital Mode
Frequency (kHz) PSD (dBm/Hz) Across 100 Ω
0.2 −46.5
1.5 −46.5
3 inband peak PSD
ƒ1 inband peak PSD
ƒint PSDint
686 −100
1411 −100 with 10 kHz and 1 MHz measurement bandwidths
1630 −100 with a 10 kHz measurement bandwidth and
−110 with a 1 MHz measurement bandwidth
5275 −100 with a 10 kHz measurement bandwidth and
−112 with a 1 MHz measurement bandwidth
30000 −100 with a 10 kHz measurement bandwidth and
−112 with a 1 MHz measurement bandwidth

Note 1: The breakpoint frequencies and PSD values are exact.

Note 2: Above ƒ1 kHz, the peak PSD shall be measured with a 10 kHz resolution bandwidth.

Note 3: The power in a 1 MHz sliding window is measured in a 1 MHz bandwidth, starting at the measurement frequency.

Designator Inband peak PSD
(dBm/Hz)
Frequency ƒ1
(kHz)
Frequency ƒint
(kHz)
Intercept PSD
(dBm/Hz)
ADLU − 32 242.92 −34.5 −93.2 138
ADLU − 36 274 −35 −94 155.25
ADLU − 40 305.16 −35.5 −94.7 172.5
ADLU − 44 336.4 −35.9 −95.4 189.75
ADLU − 48 367.69 −36.3 −95.9 207
ADLU − 52 399.04 −36.6 −96.5 224.25
ADLU − 56 430.45 −36.9 −97 241.5
ADLU − 60 461.9 −37.2 −97.4 258.75
ADLU − 64 493.41 −37.5 −97.9 276

### Figure 3.2.1.6(a): ATU-R Upstream Transmission PSD Mask for ADSL2+ All-Digital Mode

Description of Figure 3.2.1.6(a)

Figure 3.2.1.6(a) shows the Power Spectral Density (PSD) mask of the signal transmitted over the ADSL2+ upstream channel all digital mode. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30000 kHz. The numerical values for the mask are provided in Table 3.2.1.6(a).

### Figure 3.2.1.6(b): ATU-R Upstream Transmission PSD Mask Designator for ADSL2+ All-Digital Mode

Description of Figure 3.2.1.6(b)

Figure 3.2.1.6(b) shows the Power Spectral Density (PSD) mask designator for ADSL2+ upstream channel all digital mode. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30000 kHz. The numerical values for the mask are provided in Table 3.2.1.6(b).

top of page

##### 3.2.1.7 Power Spectral Density at the U-R Interface for ADSL2+ Extended Upstream
Frequency (kHz) PSD (dBm/Hz) Across 100 Ω
0.2 −97.5
4 −97.5
4 −92.5
25.875 inband peak PSD
ƒ1 inband peak PSD
ƒint PSDint
686 −100
1411 −100 with a 1 MHz measurement bandwidth
1630 −100 with a 10 kHz measurement bandwidth and
−110 with a 1 MHz measurement bandwidth
5275 −100 with a 10 kHz measurement bandwidth and
−112 with a 1 MHz measurement bandwidth
30000 −100 with a 10 kHz measurement bandwidth and
−112 with a 1 MHz measurement bandwidth

Note 1: The breakpoint frequencies and PSD values are exact.

Note 2: Above 25.875 kHz, the peak PSD shall be measured with a 10 kHz resolution bandwidth.

Note 3: The power in a 1 MHz sliding window is measured in a 1 MHz bandwidth, starting at the measurement frequency.

Designator Inband peak PSD
(dBm/Hz)
Frequency
ƒ1(kHz)
Frequency
ƒint (kHz)
Intercept PSD
(dBm/Hz)
ADLU − 32 −34.5 138 242.92 −93.2
ADLU − 36 −35 155.25 274 −94
ADLU − 40 −35.5 172.5 305.16 −94.7
ADLU − 44 −35.9 189.75 336.4 −95.4
ADLU − 48 −36.3 207 367.69 −95.9
ADLU − 52 −36.6 224.25 399.04 −96.5
ADLU − 56 −36.9 241.5 430.45 −97
ADLU − 60 −37.2 258.75 461.9 −97.4
ADLU − 64 −37.5 276 493.41 −97.9

### Figure 3.2.1.7(a): ATU-R Upstream Transmission PSD Mask for ADSL2+ Extended Upstream

Description of Figure 3.2.1.7(a)

Figure 3.2.1.7(a) shows the Power Spectral Density (PSD) mask of the signal transmitted over the ADSL2+ extended upstream channel. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30000 kHz. The numerical values for the mask are provided in Table 3.2.1.7(a).

### Figure 3.2.1.7(b): ATU-R Upstream Transmission PSD Mask Designator for ADSL2+ Extended Upstream

Description of Figure 3.2.1.7(b)

Figure 3.2.1.7(b) shows the Power Spectral Density (PSD) mask designator for ADSL2+ extended upstream channel. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30000 kHz. The numerical values for the mask are provided in Table 3.2.1.7(b).

top of page

##### 3.2.1.8 Power Spectral Density at the 2B1Q SDSL U-R Interface

The PSD of the signal transmitted by the 2B1Q SDSL transmitter shall follow the following equation:

$SDSL_{u}(ƒ)=\frac{2.7 \times 2.7}{135 \times ƒ_{sym}}\left [ \frac{sin \lgroup \pi ƒ \diagup ƒ_{sym} \rgroup}{ \pi ƒ \diagup ƒ_{sym}} \right ]^2 \times \frac{1}{1 + \left( \frac{ƒ}{\frac{240}{392}ƒ_{sym}} \right)^8 }$

In this equation, ƒsym is the symbol rate, which is equal to one-half of the line bit rate.

The actual 2B1Q PSD may differ from this template specification. However, for data rates below 1568 kbps, it shall comply with the PSD masks associated with each of the related data rates as per Table 3.2.1.8(a). The PSD limits are defined by the equations and masks in the Tables 3.2.1.8(a), (b), (c), (d), (e) and (f), and Figures 3.2.1.8(a), (b), (c), (d) and (e).

The TE shall not exceed the applicable PSD mask when operated at every data rate that the TE can achieve. The TE must be tested at least at the maximum data rate for each SDSL class in which the TE is capable of operating.

For data rates above 1568 kbps and up to 2320 kbps, the PSD of the transmitted signal shall not exceed the PSD limitations defined by the equation for SDSLu(ƒ) above, increased by 3.5 dB. At frequencies above the point where the PSD mask, as define above, falls below the peak value of the next lobe, the maximum PSD shall be equal to that particular value until the peak PSD point of the next lobe is reached. At frequencies above the point where the PSD mask, as defined above, falls below −90 dBm/Hz, the maximum PSD (out-of-band signal) shall not exceed −90 dBm/Hz up to 3 MHz.

Table 3.2.1.8(a): 2B1Q SDSL Data Rate and Associated PSD Mask Definition Tables and Figures
2B1Q SDSL Data Rate (kbps) PSD Masks
Data Rate ≤ 288 Table 3.2.1.8(b) + Figure 3.2.1.8(a)
288 < Data Rate ≤ 528 Table 3.2.1.8(c) + Figure 3.2.1.8(b)
528 < Data Rate ≤ 784 Table 3.2.1.8(d) + Figure 3.2.1.8(c)
784 < Data Rate ≤ 1168 Table 3.2.1.8(e) + Figure 3.2.1.8(d)
1168 < Data Rate ≤ 1568 Table 3.2.1.8(f) + Figure 3.2.1.8(e)
1568 < Data Rate See equation in section 3.2.1.8
Table 3.2.1.8(b): 2B1Q SDSL (Data Rate ≤ 288 kbps) PSD Mask Definition
Frequency Band (kHz) PSD (dBm/Hz)
0.2 < ƒ ≤ 25 −29
25 < ƒ ≤ 76 −29 − 10.35 × log10(ƒ/25)
76 < ƒ ≤ 79 −34 − 0.5 × ((ƒ−76)/3)
79 < ƒ ≤ 85 −34.5 − 19.6 × log10((ƒ−69)/10)
85 < ƒ ≤ 100 −38.5 − 4 × ((ƒ−85)/15)
100 < ƒ ≤ 115 −42.5 − 7 × ((ƒ−100)/15)
115 < ƒ ≤ 120 −49.5
120 < ƒ ≤ 225 −49.5 − 55 × log10(ƒ/120)
225 < ƒ ≤ 520 −64.5 − 70 × log10(ƒ/225)
520 < ƒ ≤ 30000 −90
Table 3.2.1.8(c): 2B1Q SDSL (288 kbps < Data Rate ≤ 528 kbps) PSD Mask Definition
Frequency (kHz) PSD (dBm/Hz)
0.2 −32.5
25 −32.5
75 −33
100 −35.5
150 −41.5
200 −50.5
230 −60.5
245 −67.5
335 −68.5
390 −72.5
440 −79.5
485 < ƒ ≤ 30000 −90
Table 3.2.1.8(d): 2B1Q SDSL (528 kbps < Data Rate ≤ 784 kbps) PSD Mask Definition
Frequency (kHz) PSD (dBm/Hz)
0.2 −33.5
50 −33.5
125 −34.5
210 −37.5
310 −53.5
370 −69.5
550 −71.5
670 −81.5
725 < ƒ ≤ 30000 −90
Table 3.2.1.8(e): 2B1Q SDSL (784 kbps < Data Rate ≤ 1168 kbps) PSD Mask Definition
Frequency (kHz) PSD (dBm/Hz)
0.2 −35.5
60 −35.5
200 −36.5
250 −37
315 −37.5
400 −49.5
500 −62.5
550 −71.5
750 −72.5
950 −80.5
1095 < ƒ ≤ 30000 −90
Table 3.2.1.8(f): 2B1Q SDSL (1168 kbps < Data Rate ≤ 1568 kbps) PSD Mask Definition
Frequency (kHz) PSD (dBm/Hz)
0.2 −36.5
100 −36.5
150 −37
200 −38
300 −38.5
390 −38.5
420 −39.5
500 −47.5
775 −73.5
1000 −73.5
1100 −76.5
1300 −82.5
1395 < ƒ ≤ 30000 −90

### Figure 3.2.1.8(a): PSD Mask for 2B1Q SDSL (Data Rate ≤ 288 kbps)

Description of Figure 3.2.1.8(a)

Figure 3.2.1.8(a) shows the Power Spectral Density mask for 2B1Q for data rates below 288 kbps. The PSD values are provided in dBm/Hz for a band of frequencies between 0 kHz and 800 kHz. The PSD for 2B1Q PSD may have different template specifications based on its data rate in kbps. For data rates below 288 kbps, the PSD limits are defined by the equation and mask provided in Table 3.2.1.8(b) and Figure 3.2.1.8(a).

### Figure 3.2.1.8(b): PSD Mask for 2B1Q SDSL (288 kbps < Data Rate ≤ 528 kbps)

Description of Figure 3.2.1.8(b)

Figure 3.2.1.8(b) shows the Power Spectral Density mask for 2B1Q for data rates between 288 kbps and 528 kbps. The PSD values are in dBm/Hz for a band of frequencies between 0 kHz and 800 kHz. The PSD for 2B1Q PSD may have different template specifications based on its data rate in kbps. For data rates between 288 kbps and 528 kbps, the PSD limits are defined by the equation and mask provided in Table 3.2.1.8(c) and Figure 3.2.1.8(b).

### Figure 3.2.1.8(c): PSD Mask for 2B1Q SDSL (528 kbps < Data Rate ≤ 784 kbps)

Description of Figure 3.2.1.8(c)

Figure 3.2.1.8(c) shows the Power Spectral Density mask for 2B1Q for data rates between 528 kbps and 784 kbps. The PSD values are in dBm/Hz for a band of frequencies between 0 kHz and 1200 kHz. The PSD for 2B1Q PSD may have different template specifications based on its data rate in kbps. For data rates between 528 kbps and 784 kbps, the PSD limits are defined by the equation and mask provided in Table 3.2.1.8(d) and Figure 3.2.1.8(c).

### Figure 3.2.1.8(d): PSD Mask for 2B1Q SDSL (784 kbps < Data Rate ≤ 1168 kbps)

Description of Figure 3.2.1.8(d)

Figure 3.2.1.8(d) shows the Power Spectral Density mask for 2B1Q for data rates between 784 kbps and 1168 kbps. The PSD values are in dBm/Hz for a band of frequencies between 0 kHz and 2000 kHz. The PSD for 2B1Q PSD may have different template specifications based on its data rate in kbps. For data rates between 784 kbps and 1168 kbps, the PSD limits are defined by the equation and mask provided in Table 3.2.1.8(e) and Figure 3.2.1.8(d).

### Figure 3.2.1.8(e): PSD Mask for 2B1Q SDSL (1168 kbps < Data Rate ≤ 1568 kbps)

Description of Figure 3.2.1.8(e)

Figure 3.2.1.8(e) shows the Power Spectral Density mask for 2B1Q for data rates between 1168 kbps and 1568 kbps. The PSD values are in dBm/Hz for a band of frequencies between 0 kHz and 2200 kHz. The PSD for 2B1Q PSD may have different template specifications based on its data rate in kbps. For data rates between 1168 kbps and 1568 kbps, the PSD limits are defined by the equation and mask provided in Table 3.2.1.8(f) and Figure 3.2.1.8(e).

top of page

##### 3.2.1.9 Power Spectral Density at the HDSL2 U-R Interface

The PSD of the HDSL2 transmit signal measured at the U-R interface shall not exceed the PSD mask defined in Table 3.2.1.9 and Figure 3.2.1.9.

Table 3.2.1.9: HDSL2 Mask Values for Spectral Shaper at the U-R Interface
Frequency (kHz) PSD (dBm/Hz)
≤1 −54.2
2 −42.1
10 −37.8
220 −34.4
255 −34.4
276 −41.1
175 −37.8
300 −77.6
426 −90
30000 −90

### Figure 3.2.1.9: HDSL2 TU-R PSD Mask for the Upstream Transmission

Description of Figure 3.2.1.9

Figure 3.2.1.9 shows the Power Spectral Density (PSD) mask of the HDSL (2B1Q) signal transmitted to the remote terminal end (TU-R) over a metallic channel. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 1200 kHz. Table 3.2.1.9 provides the numerical values for the PSD mask definition.

top of page

##### 3.2.1.10 Power Spectral Density at the SHDSL (Symmetric) U-R Interface

The PSD of the signal transmitted by the SHDSL system shall not exceed the following PSD mask (SHDSLM(ƒ)):

$SHDSL_{M}(ƒ)= \begin{cases} \frac{K_{SHDSL}}{135} \times \frac{1}{ƒ_{sym}} \times \frac{ \left[ sin\left( \frac{\pi ƒ}{ƒ_{sym}}\right)\right]^2}{ \left(\frac{\pi ƒ}{ƒ_{sym}}\right)^2} \times \frac{1}{1+ \left(\frac{1}{ƒ_{3dB}}\right)^{12}} \times 10^{\frac{MaskedOffsetdB(ƒ)}{10}}, ƒ < ƒ_{int} \\ 0.5683 \times 10^{-4} \times ƒ^{-1.5}, ƒ_{int} \leq ƒ \leq1.1 MHz \end{cases}$

$$MaskOffsetdB(ƒ)$$ is defined as

$MaskOffsetdB(ƒ)= \begin{cases} 1 + 0.4 \times \frac{ƒ_{3dB}-ƒ}{ƒ_{3dB}}, ƒ < ƒ_{3dB} \\ 1, ƒ \geq ƒ_{3dB} \end{cases}$

ƒint is the frequency at which the two functions governing SHDSLM(ƒ) intersect in the range 0 to ƒsym.

KSHDSL, ƒsym, ƒ3dB and the payload data rate R are defined in Table 3.2.1.10.

At frequencies above the point where the PSD mask, as defined above, falls below the peak value of the next lobe, the maximum PSD shall be equal to that particular value until the peak PSD point of the next lobe is reached.

At frequencies above the point where the PSD mask, as defined above, falls below −90 dBm/Hz, the maximum PSD (out-of-band signal) shall not exceed −90 dBm/Hz up to 30 MHz.

The transmitted spectrum shall not exceed the applicable mask when the equipment is operated at any of the data rates specified in Annex A, Table A1(d). The TE must be tested at least at the maximum data rate for each designation shown in Annex A, Table A1(d), in which the TE is capable of operating.

Table 3.2.1.10: SHDSL Symmetric PSD Parameters
Line Bit Rate (LBR)
(kbps)
KSHDSL ƒsym (ksymbols/s) ƒ3dB
≠ 1544 or 1552 7.86 LBR / 3 1.0 × ƒsym/2
= 1544 or 1552 8.32 LBR / 3 0.9 × ƒsym/2

top of page

##### 3.2.1.11 Power Spectral Density at the Extended SHDSL U-R Interface

The PSD of the signal transmitted by the extended SHDSL system shall not exceed the following PSD masks (SHDSLM(ƒ)):

$SHDSL_{M}(ƒ) = \begin{cases} \frac{K_{SHDSL}}{135} \times \frac{1}{ƒ_{sym}} \times \frac{ \left[ sin\lgroup \frac{\pi f}N{ƒ_{sym}}\rgroup \right]^2}{ \left(\frac{\pi ƒ}{Nƒ_{sym}}\right)^2} \times \frac{1}{1+ \left(\frac{1}{ƒ_{3dB}}\right)^{2 \times Order}} \times 10^{\frac{MaskedOffsetdB(ƒ)}{10}} W/Hz \mbox{, $$ƒ < ƒ_{int}$$} \\ -90 dBm/Hz peak,with max power in the [ƒ, ƒ + 1 MHz] window of \\ [10log_{10^{(0.5683 \times 10^{-4} \times ƒ^{-1.5})}} + 90]dBm \mbox{ ,$$ƒ_{int} \leq ƒ \leq 3.184MHz$$}\\ \\ -90 peak dBm/Hz with max power in the [ƒ,ƒ+1 Mhz] window of - 50dBm \\ \mbox{, $$3.184 MHz \leq ƒ \leq 12 MHz$$} \end{cases}$

The measured total power into 135 Ω shall not exceed +14 dBm.

$MaskOffsetdB(ƒ)= \begin{cases} 1 + 0.4 \times \frac{ƒ_{3dB}-ƒ}{ƒ_{3dB}}, ƒ < ƒ_{3dB} \\ 1, ƒ \geq ƒ_{3dB} \end{cases}$

where:

ƒint is the frequency at which the two functions governing SHDSLM(ƒ) intersect in the range 0 to ƒsym;

the variables KSHDSL, Order, N, ƒsym, and ƒ3dB are as defined in tables 3.2.1.11(a) and 3.2.1.11(b); and
R is the payload bit rate.

The variables ƒ, ƒsym, ƒint and ƒ3dB in the equations are in units of hertz (Hz).

Table 3.2.1.11(a): Symmetric PSD Parameters, 16-TC-PAM
(kbit/s)
KSHDSL Order N ƒsym
(ksymbol/s)
ƒ3dB
(Hz)
2320 ≤ R ≤ 3840 7.86 6 1 (R+8)/3 1.0 × ƒsym/2
Table 3.2.1.11(b): Symmetric PSD Parameters, 32-TC-PAM
(kbit/s)
KSHDSL Order N ƒsym
(ksymbol/s)
ƒ3dB
(Hz)
768 ≤ R ≤ 5696 7.86 6 1 (R+8)/4 1.0 × ƒsym/2

top of page

##### 3.2.1.12 Power Spectral Density at the HDSL4 U-R Interface

The PSD of the HDSL4 transmit signal measured at the U-R interface shall not exceed the PSD mask defined in Table 3.2.1.12 and Figure 3.2.1.12.

Table 3.2.1.12: PSD Mask Definition for Upstream Transmission from HDSL4 TU
Frequency Band (kHz) PSD (dBm/Hz)
0 < ƒ ≤ 0.2 −47.5
0.2 < ƒ ≤ 2 −37.5 + 10(ƒ−2)/1.8
2 < ƒ ≤ 5 −33.5 + 4(ƒ−5)/3
5 < ƒ ≤ 50 −33.5
50 < ƒ ≤ 125 −33.5 − ((ƒ−50)75)
125 < ƒ ≤ 130 −34.5
130 < ƒ ≤ 307 −34.5 − 142 x log10(ƒ/130)
307 < ƒ ≤ 30000 −90

### Figure 3.2.1.12: PSD Mask for Upstream Transmission from HDSL4 TU-R

Description of Figure 3.2.1.12

Figure 3.2.1.12 shows the Power Spectral Density (PSD) mask of the HDSL4 signal transmitted to the remote terminal end (TU-R) over a metallic channel. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 600 kHz. Table 3.2.1.12 provides the numerical values for the mask for upstream transmission.

top of page

ICI
##### 3.2.1.13 Power Spectral Density at the U-R Interface for VDSL (QAM/DMT)

The PSD of the signal transmitted over the VDSL upstream channel (VTU-R output) shall not exceed the PSD mask in Figure 3.2.1.13 when operated at every data rate that the TE can achieve. The TE must be tested at least at the maximum data rate at which the TE is capable of operating. Table 3.2.1.13 provides the numerical values for the mask in Figure 3.2.1.13.

Table 3.2.1.13: VTU-R PSD Mask Definition (VDSL [QAM/DMT])
Frequency (kHz) PSD (dBm/Hz)
0.2 − 4 −97.5
25 −34.5
138 −34.5
307 −86.5
368 −90
3655 −90
3750 −76.5
3751 −49.5
5199 −49.5
5200 −76.5
5287 −90
8412 −90
8500 −76.5
8501 −50.5
11999 −50.5
12000 −76.5
12087 −90
30000 −90

### Figure 3.2.1.13: VTU-R Upstream Transmission PSD Mask for VDSL (QAM/DMT)

Description of Figure 3.2.1.13

Figure 3.2.1.13 shows the Power Spectral Density (PSD) mask of the signal transmitted over the VDSL upstream channel. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 1500 kHz. The numerical values for the mask are provided in Table 3.2.1.2.

top of page

##### 3.2.1.14 Power Spectral Density at the U-R Interface for VDSL2 Over POTS

The PSD of the signal transmitted over the VDSL2 upstream channel (VTU-R output) shall not exceed the PSD masks in figures 3.2.1.14(a) to (f) when operated at every data rate that the TE can achieve. The TE must be tested at least at the maximum data rate at which the TE is capable of operating. Tables 3.2.1.14 (a) and (b) provide the numerical values for the masks in figures 3.2.1.14(a) to (f).

Table 3.2.1.14(a ): VTU-R PSD Mask Definition (VDSL2 Upstream Operation Over POTS)
Frequency (kHz) PSD level (dBm/Hz) for profiles 8a, 8b, 8c, 8d across 100 Ω PSD level (dBm/H) for profiles 12a, 12b, 17a across 100 Ω PSD level (dBm/Hz) for profiles 30a across 100 Ω RBW
0.2 −97.5 −97.5 −97.5 100 Hz
4 −97.5 −97.5 −97.5 100 Hz
4 −92.5 −92.5 −92.5 100 Hz
25.875 PSD1 PSD1 PSD1 10 kHz
ƒOH PSD1 PSD1 PSD1 10 kHz
ƒint PSDint PSDint PSDint 10 kHz
686 −100 −100 −100 10 kHz
3575 −100 −100 −100 10 kHz
3750 −80 −80 −80 10 kHz
3750 −49.5 −49.5 −49.5 10 kHz
5200 −49.5 −49.5 −49.5 10 kHz
5200 −80 −80 −80 10 kHz
5375 −100 −100 −100 10 kHz
8375 −100 −100 −100 10 kHz
8500 −100 −80 −80 10 kHz
8500 −100 −50.5 −50.5 10 kHz
12000 −100 −50.5 −50.5 10 kHz
12000 −100 −80 −80 10 kHz
12175 −100 −100 −100 10 kHz
22825 −100 −100 −100 10 kHz
23000 −100 −100 −80 10 kHz
23000 −100 −100 −56.5 10 kHz
30000 −100 −100 −56.5 10 kHz
30000 −80 10 kHz
30175 −110 10 kHz
Table 3.2.1.14(b): VTU-R Inband Peak PSD1, PSDint and the Frequencies ƒOH and ƒint
(VDSL2 Upstream Operation Over POTS)
Upstream
Designator PSD1
(dBm/Hz)
Frequency ƒOH
(kHz)
Intercept Frequency ƒint
(kHz)
Intercept PSD Level
PSDint (dBm/Hz)
1 ADLU − 32 −34.5 138 242.92 −93.2
2 ADLU − 36 −35 155.25 274 −94
3 ADLU − 40 −35.5 172.5 305.16 −94.7
4 ADLU − 44 −35.9 189.75 336.4 −95.4
5 ADLU − 48 −36.3 207 367.69 −95.9
6 ADLU − 52 −36.6 224.25 399.04 −96.5
7 ADLU − 56 −36.9 241.5 430.45 −97
8 ADLU − 60 −37.2 258.75 461.9 −97.4
9 ADLU − 64 −37.5 276 493.41 −97.9

Note: EU-32 through EU-64 shall not be used in conjunction with EU-128.

### Figure 3.2.1.14(a): VDSL2 PSD Mask for Profiles 8a, 8b, 8c and 8d Upstream Operation Over POTS

Description of Figure 3.2.1.14(a)

Figure 3.2.1.14(a) shows the Power Spectral Density (PSD) mask of the signal transmitted over the VDSL2 upstream channel (VTU-R output) operation over plain old telephone service (POTS) for profiles 8a, 8b, 8c and 8d. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30000 kHz. The numerical values for the mask are provided in Tables 3.2.1.14(a) and (b).

### Figure 3.2.1.14(b): VDSL2 PSD Mask for Profiles 12a, 12b and 17a Upstream Operation Over POTS

Description of Figure 3.2.1.14(b)

Figure 3.2.1.14(b) shows the Power Spectral Density (PSD) mask of the signal transmitted over the VDSL2 upstream channel (VTU-R output) operation over plain old telephone service (POTS) for profiles 12a, 12b and 17a. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30000 kHz. The numerical values for the mask are provided in Tables 3.2.1.14(a) and (b).

### Figure 3.2.1.14(c): VDSL2 PSD Mask for Profile 30a Upstream Operation Over POTS

Description of Figure 3.2.1.14(c)

Figure 3.2.1.14(c) shows the Power Spectral Density (PSD) mask of the signal transmitted over the VDSL2 upstream channel (VTU-R output) operation over plain old telephone service (POTS) for profile 30a. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30175 kHz. The numerical values for the mask are provided in Tables 3.2.1.14(a) and (b).

Table 3.2.1.14(c): VDSL2 EU-128 PSD Mask Limits for Profiles 8a, 8b, 8c, 8d, 12a, 12b, 17a and 30a Upstream Operation Over POTS
Frequency
(kHz)
PSD Level (dBm/Hz) for
Profiles 8a, 8b, 8c, 8d
Across 100 Ω
PSD Level(dBm/Hz)
for Profiles 12a, 12b, 17a
Across 100 Ω
PSD level (dBm/Hz)
For Profiles 30a
Across 100 Ω
RBW
0.2 −97.5 −97.5 −97.5 100 Hz
4 −97.5 −97.5 −97.5 100 Hz
4 −92.5 −92.5 −92.5 100 Hz
25.875 −34.5 −34.5 −34.5 10 kHz
138 −34.5 −34.5 −34.5 10 kHz
552 −40.6 −40.6 −40.6 10 kHz
989 −100 −100 −100 10 kHz
3575 −100 −100 −100 10 kHz
3750 −80 −80 −80 10 kHz
3750 −49.5 −49.5 −49.5 10 kHz
5200 −49.5 −49.5 −49.5 10 kHz
5200 −80 −80 −80 10 kHz
5375 −100 −100 −100 10 kHz
8375 −100 −100 −100 10 kHz
8500 −100 −80 −80 10 kHz
8500 −100 −50.5 −50.5 10 kHz
12000 −100 −50.5 −50.5 10 kHz
12000 −100 −80 −80 10 kHz
12175 −100 −100 −100 10 kHz
22825 −100 −100 −100 10 kHz
23000 −100 −100 −80 10 kHz
23000 −100 −100 −56.5 10 kHz
30000 −100 −100 −56.5 10 kHz
30000 −80 10 kHz
30175 −110 −110 −110 10 kHz

### Figure 3.2.1.14(d): VDSL2 EU-128 PSD Mask for Profiles 8a, 8b, 8c and 8d Upstream Operation Over POTS

Description of Figure 3.2.1.14(d)

Figure 3.2.1.14(d) shows the Power Spectral Density (PSD) mask of the signal transmitted over the VDSL2 upstream channel (VTU-R output) operation over plain old telephone service (POTS) for profiles 8a, 8b, 8c and 8d. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30175 kHz. The numerical values for the PSD VDSL2 with designator EU-128 mask are provided in Table 3.2.1.14(c).

### Figure 3.2.1.14(e): VDSL2 EU-128 PSD Mask for Profiles 12a, 12b and 17a Upstream Operation Over POTS

Description of Figure 3.2.1.14(e)

Figure 3.2.1.14(e) shows the Power Spectral Density (PSD) mask of the signal transmitted over the VDSL2 upstream channel (VTU-R output) operation over plain old telephone service (POTS) for profiles 12a, 12b and 17a. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30175 kHz. The numerical values for the PSD VDSL2 with designator EU-128 mask are provided in Table 3.2.1.14 (c).

### Figure 3.2.1.14(f): VDSL2 EU-128 PSD Mask for Profile 30a Upstream Operation Over POTS

Description of Figure 3.2.1.14(f)

Figure 3.2.1.16(f) shows the Power Spectral Density (PSD) mask of the signal transmitted over the VDSL2 upstream channel (VTU-R output) operation over plain old telephone service (POTS) for profile 30a. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30175 kHz. The numerical values for the PSD VDSL2 with designator EU-128 mask are provided in Table 3.2.1.14(c).

top of page

##### 3.2.1.15 Power Spectral Density at the U-R Interface for VDSL2 All-Digital Mode

The PSD of the signal transmitted over the VDSL2 upstream channel (VTU-R output) shall not exceed the PSD masks in figures 3.2.1.15(a) to (f) when operated at every data rate that the TE can achieve. The TE must be tested at least at the maximum data rate at which the TE is capable of operating. Tables 3.2.1.15(a) and (b) provide the numerical values for the masks in figures 3.2.1.15(a) to (f).

Table 3.2.1.15(a): VTU-R PSD Mask Definition (VDSL2 Upstream Operation All-Digital Mode)
Frequency
(kHz)
PSD Level (dBm/Hz)
for Profile 8a, 8b, 8c, 8d
Across 100 Ω
PSD Level (dBm/Hz)
for Profiles 12a, 12b, 17a
Across 100 Ω
PSD Level (dBm/Hz)
for Profiles 30a
Across 100 Ω
RBW
0.2 −46.5 −46.5 −46.5 100 Hz
1.5 −46.5 −46.5 −46.5 100 Hz
3 PSD1 PSD1 PSD1 100 Hz
ƒOH PSD1 PSD1 PSD1 10 kHz
ƒint PSDint PSDint PSDint 10 kHz
686 −100 −100 −100 10 kHz
3575 −100 −100 −100 10 kHz
3750 −80 −80 −80 10 kHz
3750 −49.5 −49.5 −49.5 10 kHz
5200 −49.5 −49.5 −49.5 10 kHz
5200 −80 −80 −80 10 kHz
5375 −100 −100 −100 10 kHz
8375 −100 −100 −100 10 kHz
8500 −100 −80 −80 10 kHz
8500 −100 −50.5 −50.5 10 kHz
12000 −100 −50.5 −50.5 10 kHz
12000 −100 −80 −80 10 kHz
12175 −100 −100 −100 10 kHz
22825 −100 −100 −100 10 kHz
23000 −100 −100 −80 10 kHz
23000 −100 −100 −56.5 10 kHz
30000 −100 −100 −56.5 10 kHz
30000 −80 10 kHz
30175 −110 10 kHz
Table 3.2.1.15(b): VTU-R Inband Peak PSD1, PSDint and the Frequencies ƒOH and ƒint
(VDSL2 Upstream Operation All-Digital Mode)
Upstream
Designator Inband Peak
PSD
(dBm/Hz)
Frequency
ƒOH (kHz)
Frequency
ƒint (kHz)
Intercept
PSD
(dBm/Hz)
1 ADLU − 32 −34.5 138 242.92 −93.2
2 ADLU − 36 −35 155.25 274 −94
3 ADLU − 40 −35.5 172.5 305.16 −94.7
4 ADLU − 44 −35.9 189.75 336.4 −95.4
5 ADLU − 48 −36.3 207 367.69 −95.9
6 ADLU − 52 −36.6 224.25 399.04 −96.5
7 ADLU − 56 −36.9 241.5 430.45 −97
8 ADLU − 60 −37.2 258.75 461.9 −97.4
9 ADLU − 64 −37.5 276 493.41 −97.9

### Figure 3.2.1.15(a): VDSL2 PSD Mask for Profiles 8a, 8b, 8c and 8d Upstream All-Digital Mode Operation

Description of Figure 3.2.1.15(a)

Figure 3.2.1.15(a) shows the Power Spectral Density (PSD) mask of the signal transmitted over the VDSL2 upstream channel (VTU-R output) for all digital operation mode for profiles 8a, 8b, 8c and 8d. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30000 kHz. The numerical values for the PSD VDSL2 mask are provided in Tables 3.2.1.15(a) and (b).

Note: EU-32 through EU-64 shall not be used in conjunction with EU.

### Figure 3.2.1.15(b): VDSL2 PSD Mask for Profiles 12a, 12b and 17a Upstream All-Digital Mode Operation

Description of Figure 3.2.1.15(b)

Figure 3.2.1.15(b) shows the Power Spectral Density (PSD) mask of the signal transmitted over the VDSL2 upstream channel (VTU-R output) for all digital operation mode for profiles 12a, 12b and 17a. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30000 kHz. The numerical values for the PSD VDSL2 mask are provided in Tables 3.2.1.15(a) and (b).

### Figure 3.2.1.15(c): VDSL2 PSD Mask for Profile 30a Upstream All-Digital Mode Operation

Description of Figure 3.2.1.15(c)

Figure 3.2.1.15(c) shows the Power Spectral Density (PSD) mask of the signal transmitted over the VDSL2 upstream channel (VTU-R output) for all digital operation mode for profile 30a. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30175 kHz. The numerical values for the PSD VDSL2 mask are provided in Tables 3.2.1.15(a) and (b).

Table 3.2.1.15(c): VDSL2 ADLU-128 PSD Mask Limits for Profiles 8a, 8b, 8c, 8d, 12a, 12b, 17a and 30a Upstream All-Digital Mode Operation
Frequency
(kHz)
PSD Level
(dBm/Hz) for
Profiles 8a, 8b, 8c, 8d
Across 100 Ω
PSD Level
(dBm/Hz) for
Profiles 12a, 12b, 12c, 17a
Across 100 Ω
PSD Level
(dBm/Hz) for
Profiles 30a
Across 100 Ω
RBW
0.2 −46.5 −46.5 −46.5 100 Hz
1.5 −46.5 −46.5 −46.5 100 Hz
3 −34.5 −34.5 −34.5 100 Hz
138 −34.5 −34.5 −34.5 10 kHz
552 −40.6 −40.6 −40.6 10 kHz
989 −100 −100 −100 10 kHz
3575 −100 −100 −100 10 kHz
3750 −80 −80 −80 10 kHz
3750 −49.5 −49.5 −49.5 10 kHz
5200 −49.5 −49.5 −49.5 10 kHz
5200 −80 −80 −80 10 kHz
5375 −100 −100 −100 10 kHz
8375 −100 −100 −100 10 kHz
8500 −100 −80 −80 10 kHz
8500 −100 −50.5 −50.5 10 kHz
12000 −100 −50.5 −50.5 10 kHz
12000 −100 −80 −80 10 kHz
12175 −100 −100 −100 10 kHz
22825 −100 −100 −100 10 kHz
23000 −100 −100 −80 10 kHz
23000 −100 −100 −56.5 10 kHz
30000 −100 −100 −56.5 10 kHz
30000 −80 10 kHz
30175 −110 10 kHz

### Figure 3.2.1.15(d): VDSL2 ADLU-128 PSD Mask for Profiles 8a, 8b, 8c and 8d Upstream All-Digital Mode Operation

Description of Figure 3.2.1.15(d)

Figure 3.2.1.15(d) shows the Power Spectral Density (PSD) mask of the signal transmitted over the VDSL2 upstream channel (VTU-R output) for all digital operation mode for profiles 8a, 8b, 8c and 8d. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30000 kHz. The numerical values for the PSD VDSL2 mask with designator ADLU-128 are provided in Table 3.2.1.15(c).

### Figure 3.2.1.15(e): VDSL2 ADLU-128 PSD Mask for Profiles 12a, 12b and 17a Upstream All-Digital Mode Operation

Description of Figure 3.2.1.15(e)

Figure 3.2.1.15(e) shows the Power Spectral Density (PSD) mask of the signal transmitted over the VDSL2 upstream channel (VTU-R output) for all digital operation mode for profiles 12a, 12b and 17a. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30000 kHz. The numerical values for the PSD VDSL2 mask with designator ADLU-128 are provided in Table 3.2.1.15(c).

### Figure 3.2.1.15(f): VDSL2 ADLU-128 PSD Mask for Profile 30a Upstream All-Digital Mode Operation

Description of Figure 3.2.1.15(f)

Figure 3.2.1.15(f) shows the Power Spectral Density (PSD) mask of the signal transmitted over the VDSL2 upstream channel (VTU-R output) for all digital operation mode for profile 30a. This figure shows the PSD values in dBm/Hz in a band of frequencies between 0 kHz and 30175 kHz. The numerical values for the PSD VDSL2 mask with designator ADLU-128 are provided in Table 3.2.1.15(c).

#### 3.2.2 Method of Measurement

1. Connect the xDSL equipment as shown in Figure 3.2.2.
2. Operate the xDSL equipment (xTU-R working without xTU-C) and force it to transmit at maximum power.
3. Set S1 to position "A" (four-pole switch).
4. Set the spectrum analyzer to capture the top portion of the upstream band with a suggested resolution bandwidth (RBW) of 10 kHz and video bandwidth of 100 Hz.
5. Evaluate the TE signal for compliance with the appropriate spectrum mask using an impedance of 100 Ω for ADSL, VDSL and VDSL2, and 135 Ω for HDSL2, HDSL4, SDSL and SHDSL.
6. Set S1 to position "B" (four-pole switch).
7. Set the high pass filter to an appropriate roll-off frequency that attenuates the signal pass-band (operating band).
8. Evaluate the TE signal for compliance with the spectrum mask in the lower and upper out-of-band region using an impedance of 100 Ω for ADSL, VDSL, VDSL2, and 135 Ω for HDSL2, HDSL4, SDSL and SHDSL.

### Figure 3.2.2: xDSL PSD (xTU-R Band = Upstream Transmitted Signal for All DSL Technologies)

Description of Figure 3.2.2

Figure 3.2.2 describes the test circuit to evaluate the terminal equipment signal for compliance with the spectrum mask in the lower and upper out-of-band region using an impedance of 100 Ω for all ADSL/VDSL and 135 Ω for all other VDSL types.

Note: When the TE makes provision for an external connection to ground (G), the TE shall be connected to ground. When the TE makes no provision for an external ground, the TE shall be placed on a ground plane that is connected to ground and has overall dimensions at least 50% greater than the corresponding dimensions of the TE. The TE shall be centrally located on the ground plane without any additional connection to ground. At no point in time should any metal surface of the TE come in contact with the ground plane. If the TE has exposed metal that would come in contact with the metal ground plane, a thin insulating material shall be inserted between the ground plane and the TE.

The above is an illustrative test diagram. If the spectrum analyzer has an unbalanced input, an external differential amplifier or balun transformer should be used. Additional high-pass filtering may also be necessary to increase measurement sensitivity when making low-level PSD measurements.

top of page

### 3.3 Total Signal Power

#### 3.3.1 Requirements

The total upstream signal power shall not exceed 13 dBm where the termination impedance is 100 Ω.

##### 3.3.1.2 2B1Q SDSL Total Signal Power

The TE must be tested at least at the maximum data rate for each spectrum management class in which the TE is capable of operating.

The equipment must comply with the applicable power limit when operated at every data rate that the TE can achieve.

Excluding remote power feeding, the average power of a signal consisting of equiprobable symbols in all positions shall not exceed 14 dBm over the frequency band of 0 Hz to symbol frequency (which is equal to one-half of the line bit rate) into a termination of 135 Ω.

##### 3.3.1.3 HDSL2 Total Signal Power

The total average transmit power may be tested while span powered or locally powered as required by the intended application of the TE. For span powered applications, if the TE is an HDSL2 TU-R, the test shall be performed with power (DC voltage) applied at the loop interface (tip/ring) by an external voltage source feeding through an AC blocking impedance. The test circuit must contain provisions for DC power feed and possibly transformer isolation for the measurement instrumentation. The DC current source/sink must present a high impedance (at signal frequencies) to common ground.

The total average transmit power of the HDSL2 TU-R (into 135 Ω) below 350 kHz shall not exceed 17.0 dBm.

##### 3.3.1.4 SHDSL (Symmetric) and Extended SHDSL (ESHDSL) Total Signal Power

The total average signal power below ƒsym transmitted by the SHDSL and ESHDSL TU-R shall not exceed 14 dBm, where the termination impedance is 135 Ω.

##### 3.3.1.5 HDSL4 Total Signal Power at the U-R Interface

The total signal power transmitted by HDSL4 TU-R below 307 kHz shall not exceed 14.6 dBm, where the termination impedance is 135 Ω.

##### 3.3.1.6 VDSL (QAM/DMT) and VDSL2 Total Signal Power at the U-R Interface Points

The total upstream signal power transmitted by VDSL (QAM/DMT) and VDSL2 TU-R shall not exceed 14.5 dBm when operated at every data rate that the TE can achieve, where the termination impedance is 100 Ω. The TE must be tested at least at the maximum data rate at which the TE is capable of operating.

#### 3.3.2 Method of Measurement of Total Signal Power for All DSL Technologies

The total average transmit power may be tested while the TE is span-powered or locally powered, as required by the intended application of the TE. For span-powered applications, if the TE is a TU-R, the test shall be performed with the DC power applied at the loop interface by an external voltage source feeding through an AC blocking impedance. The DC current source/sink must present a high impedance (at signal frequencies) to common ground.

1. Connect the xDSL equipment as shown in Figure 3.2.2.
2. Set the spectrum analyzer to capture the upstream band with a suggested resolution bandwidth of 1 kHz and video bandwidth of 100 Hz.
3. Measure and record the nominal 3 dB roll off points.
4. Connect the xDSL equipment as shown in Figure 3.3.2.
5. Operate the xDSL equipment (xTU-R working without xTU-C) and force it to transmit at maximum power.
6. Use the appropriate band pass filter for xTU-R (upstream lower and upper 3 dB points). Measure and record the total signal power in dBm with a termination impedance of 100 Ω for ADSL, VDSL and VDSL2, and 135 Ω for all other DSL types.

### Figure 3.3.2: xDSL Total Signal Power (xTU-R Band = Upstream Transmitted Signal for All DSL Technologies)

Description of Figure 3.3.2

Figure 3.3.2 describes the test circuit to measure and record the total signal power in dBm with a termination impedance of 100 Ω for all ADSL/VDSL, and 135 Ω for all other VDSL types.

Band pass filter: xTU-R band
Attenuation slope = 24 dB/Octave
Insertion loss 0 dB ±0.5 dB
Input impedance = 100 kΩ minimum in parallel with 50 pF maximum
Output impedance = 50 Ω
Hum and noise = 100 uVrms maximum

Note: When the TE makes provision for an external connection to ground (G), the TE shall be connected to ground. When the TE makes no provision for an external ground, the TE shall be placed on a ground plane that is connected to ground and has overall dimensions at least 50% greater than the corresponding dimensions of the TE. The TE shall be centrally located on the ground plane without any additional connection to ground. At no point in time should any metal surface of the TE come in contact with the ground plane. If the TE has exposed metal that would come in contact with the metal ground plane, a thin insulating material shall be inserted between the ground plane and the TE.

The above is an illustrative test diagram. If the spectrum analyzer has an unbalanced input, an external differential amplifier or balun transformer should be used. Additional high-pass filtering may also be necessary to increase measurement sensitivity when making low-level PSD measurements.

top of page

### 3.4 Transverse Balance

#### 3.4.1 Requirements

The transverse balance of the TU-R shall exceed the values in Table 3.4.2 over the voice band from 200 Hz to 4000 Hz and over the entire range of frequencies between the lower and upper −20 dB points (relative to peak PSD) of the signal pass band as determined from the appropriate DSL PSD mask, with the ZL, ZM and VM set to the values defined in tables 3.4.3(a) to 3.4.3(e).

Note 1: When using the actual −20 dB points from the transmitted signal to define the frequency range, the TE shall be transmitting at maximum power.

Note 2: Table 3.4.2 specifies the limits for the entire frequency range. The TE must only be tested to the applicable frequency range, which in most cases is between 200 Hz and 4 kHz (voice band) and from 12 kHz to 30 MHz (−20 dB points). All other frequency ranges below or above the −20 dB points are not applicable even if shown in Table 3.4.2.

Transverse balance is a comparison of the voltage of a transmitted metallic signal to the voltage of any resulting longitudinal signal. It is defined in dB as:

Transverse balance M − L = 20 log10[VM(ƒ)/VL(ƒ)]

where:

VM(ƒ) is the metallic voltage at frequency ƒ applied across tip and ring conductors of the port under test by a balanced source with metallic impedance ZM; and
VL(ƒ) is the resultant longitudinal voltage appearing across a longitudinal impedance ZL.

The greater the VM to VL ratio, the better the transverse balance of the transceiver unit and the less likely that it will contribute to a crosstalk interference problem. When calibrating the testing arrangement, the source metallic voltage should equal VM when a metallic termination of ZM is substituted for the equipment under test. For all the different types of DSL, refer to tables 3.4.3(a) to 3.4.3(e) to find the correct values for metallic impedance ZM, longitudinal impedance ZL and metallic voltage VM.

top of page

#### 3.4.2 Method of Measurement

1. Connect the TE as shown in Figure 3.4.3.
2. Set the spectrum analyzer / tracking generator to sweep the appropriate frequency range. Refer to Table 3.4.2 for the frequency bands. If the actual −20 dB points from the transmitted signal are used to define the frequency range, the TE shall be transmitting at maximum power.
3. Adjust the tracking generator voltage to the appropriate value for the type of DSL under test, across the calibration test resistor R3, using switch S1. Refer to tables 3.4.3(a) to 3.4.3(e) for the correct values.
4. Connect the detector across resistor R2.
5. Adjust the differential trimmer capacitor until a minimum voltage across resistor R2 is obtained. This represents the highest degree to which the bridge can be balanced, and this balance measurement must be at least 20 dB better than the requirement for the applicable frequency band. If this degree of balance cannot be attained, further attention should be given to the component selection and the construction of the test circuit.
6. Reverse the polarity using switch S3. If the longitudinal voltage (EL) changes by less than 1 dB, the calibration is acceptable. If the longitudinal voltage changes by more than 1 dB, it indicates the bridge needs further adjustment to be sufficiently balanced to accurately measure the TE. Repeat the calibration process until the measurements differ by less than 1 dB while maintaining the 20 dB minimum balance noted in step 5 above.
7. Replace the calibration resistor with the TE, using switches S1 and S2.
8. Measure the voltage across the tip and ring of the TE. This is the metallic reference voltage (EM).
9. Measure the voltage across resistor R2. This is the longitudinal voltage (EL).
10. Calculate the balance using the following formula:
Balance M/L (dB) = 20 log10 (Vm/VL)

Note 1: If the readings are taken in dBV, then the equation can be simplified to the following: Balance M/L (dB) = Vm(dBV) − Vl (dBV)

Note 2: TE that is not normally grounded should be set in its normal at-rest position directly on a grounded plane whose overall dimensions are at least 50% greater than the footprint of the TE. From a transverse balance standpoint, this represents a worst-case condition (i.e. the closest proximity to ground that is likely to be encountered by the TE).

Note 3: Transverse balance may be measured while the TE is line powered or locally powered. If the TE is line powered then the test circuit shall contain a DC voltage source. The test shall be performed with the appropriate DC voltage source applied between the tip and ring conductors through an AC blocking impedance. The DC current source or sink must present high impedance (at signal frequencies) to common ground. In line powered applications, the test circuit shall contain provisions for isolation of the measurement instrumentation from unintentional circuit paths through the common ground of the instrumentation and the TE power feed circuitry.

Table 3.4.2: Minimum Transverse Balance Requirements
Frequency Band (kHz) Minimum Transverse Balance
200 Hz < ƒ ≤ 12 kHz 40 dB
12 kHz < ƒ ≤ 1544 kHz 35 dB
1544 kHz < ƒ ≤ 12 MHz 30 dB
12 MHz < ƒ ≤ 30 MHz 25 dB

Note: Any range of frequency between the voice band (200 Hz to 4 kHz) and the lower −20 dB point, and any range of frequency above the upper −20 dB point are not applicable, even if shown in Table 3.4.2.

top of page

#### 3.4.3 Transverse Balance Testing Criteria

Table 3.4.3(a): Frequency Range of Transverse Balance Requirements for ADLS Over POTS
Interface Frequency Range
(kHz)
Longitudinal
Termination
(ZL) (Ω)
Metallic
Termination
(ZM) (Ω)
Metallic
Voltage
(VM) (V)
ADSL 13.6 to 1625 90 100 0.316
ADSL2 13.6 to 1625 90 100 0.316
READSL 13.6 to 1625 90 100 0.316
ADSL2+ 13.6 to 2425 90 100 0.316
Table 3.4.3(b): Frequency Range of Transverse Balance Requirements for ADSL All-Digital Mode Equipment
Interface Frequency Range
(kHz)
Longitudinal
Termination
(ZL) (Ω)
Metallic
Termination
(ZM) (Ω)
Metallic
Voltage
(VM) (V)
ADSL2 0.2 to 2425 90 or 500 100 0.316
ADSL2+ 0.2 to 2425 90 or 500 100 0.316
Table 3.4.3(c): Frequency Range of Transverse Balance Requirements for SHDSL, ESHDSL, HDSL2 and HDSL4 Equipment
Interface Frequency Range
(kHz)
Longitudinal
Termination
(ZL) (Ω)
Metallic
Termination
(ZM) (Ω)
Metallic
Voltage (VM) (V)
SHDSL 0.2 to 490 90 or 500 135 0.367
ESHDSL 0.2 to 761 90 or 500 135 0.367
HDSL2 0.2 to 422 90 or 500 135 0.367
HDSL4 0.2 to 494 90 or 500 135 0.367
Table 3.4.3(d): Frequency Range of Transverse Balance requirements for 2B1Q SDSL
Interface Frequency Range
(kHz)
Longitudinal
Termination
(ZL) (Ω)
Metallic
Termination
(ZM) (Ω)
Metallic
Voltage (VM) (V)
2B1Q SDSL 0.2 to 575 90 or 500 135 0.367
Table 3.4.3(e): Frequency Range of Transverse Balance Requirements for VDSL and VDSL2
Interface Frequency Range
(kHz)
Longitudinal
Termination
(ZL) (Ω) (Note)
Metallic
Termination
(ZM) (Ω)
Metallic
Voltage (VM) (V)
VDSL over POTS 13.6 to 12000 90 100 0.316
VDSL2 over POTS
profiles 8a, 8b, 8c, and 8d
13.6 to 8500 90 100 0.316
VDSL2 over POTS
profiles 12a and 12b
13.6 to 12000 90 100 0.316
VDSL2 over POTS
profiles 17a
13.6 to 20500 90 100 0.316
VDSL2 over POTS
profile 30a
13.6 to 30000 90 100 0.316
VDSL2 all digital mode
profiles 8a, 8b, 8c, and 8d
0.2 to 8500 90/500 100 0.316
VDSL2 all digital mode
profiles 12a and 12b
0.2 to 12000 90/500 100 0.316
VDSL2 all digital mode
profile 17a
0.2 to 20500 90/500 100 0.316
VDSL2 all digital mode
profile 30a
0.2 to 30000 90/500 100 0.316

Note: The longitudinal impedance (ZL) shall be 500 Ω for frequencies from 200 Hz to 12 kHz and 90 Ω for frequencies above 12 kHz.

### Figure 3.4.3: Illustrative Test Configuration for Transverse Balance Conformance Testing

Description of Figure 3.4.3

Figure 3.4.3 describes the test circuit to measure all DSL terminal equipment signal for compliance with transverse balance limits. Test circuit configuration is based on the type of the DSL device; testing criteria establishes different values for longitudinal and metallic termination. The numerical values for longitudinal and metallic termination are provided in Tables 3.4(b) to 3.4(f).

Notes:

1. The combined resistance of R1 and the tracking generator output resistance shall equal the TE impedance (100 or 135 Ω).
2. Use a center-tapped 1:1 transformer (e.g. Midcom 671-5767 or equivalent).
3. R2 provides the desired longitudinal impedance using 90− or 500−Ω metal film or other non-inductive resistor.
4. High impedance spectrum analyzer or frequency selective voltmeter. It may be unbalanced.
5. Differential trimmer capacitor, 2.4 to 24.5 pF, Johnson 189-0759-005 or equivalent.
6. Any high impedance balanced or floating voltmeter with adequate frequency response. It need not be frequency selective.
7. R3 provides the desired calibration impedance using a 100− or 135−Ω metal film or other non-inductive resistor.

### 3.5 Longitudinal Output Voltage

Compliance with the limits for each DSL type is required with a longitudinal termination which has an impedance equal to or greater than a 100−Ω resistor in series with a 0.15−µF capacitor. The longitudinal output voltage in all 4−kHz frequency bands (averaged over a minimum period of 1 second) shall not exceed the values in tables 3.5(a) and 3.5(c) over the indicated range of frequencies between the lower and upper −30 dB points (relative to peak PSD) of the signal pass band as determined from the appropriate PSD mask for the DSL type. Use appropriate lower, upper and 4× upper −30 dB points for each DSL type. The actual −30 dB points from the transmitted signal may also be used to define the frequency range. The metallic test impedance ZM is defined in tables 3.4.3(a) to 3.4.3(e).

Note: When using the actual −30 dB points from the transmitted signal to define the frequency range, the TE shall be transmitting at maximum power.

top of page

#### 3.5.1 Method of Measurement

1. Connect the TE as shown in Figure 3.5.
2. Set the spectrum analyzer to sweep the appropriate frequency range for the operating band of the DSL system being tested. If the actual −30 dB points from the transmitted signal are used to set the frequency bands, the TE shall be transmitting at maximum power.
3. Measure and record the true rms longitudinal voltage in all 4 kHz frequency bands, averaged over a minimum period of 1 second. An alternative resolution bandwidth of 3 kHz may be used provided that either the limits are reduced by 1.3 dB (to −51.3 dBV or −81.3 dBV) or the readings are corrected by adding 1.3 dB.
4. Compare the values obtained in step 3 with the limits of tables 3.5(a) and (c).
5. Set the spectrum analyzer to sweep the appropriate frequency range for the out-of-band region of the DSL system being tested. Refer to tables 3.5(a) and (c) for the frequency bands or use the actual −30 dB points from the transmitted signal to set the frequency bands. If the actual −30 dB points from the transmitted signal are used to set the frequency bands, the TE shall be transmitting at maximum power.
Table 3.5(a): Maximum Longitudinal Output Voltage Limit for VDSL2 Terminal Equipment
Frequency Band (kHz)(notes 1, 2) Maximum longitudinal output voltage (dBVrms) in
All 4 kHz Bands Averaged Over a Minimum Period of 1 Second(Note 3)
Profiles 8a, 8b, 8c, and 8d Profiles 12a and 12b Profile 17a Profile 30a
ƒa(note 1) to ƒb (note 2) −50 −50 −50 −50
ƒb (note 2) to 3750 −80 −80 −80 −80
3750 to 5200 −50 −50 −50 −50
5200 to 8500 −80 −80 −80 −80
8500 to 12000 −50 −50 −50
12000 to 21000 −80 −80 −80
21000 to 23000 −80 −80
23000 to 30000 −80 −50

Note 1: Frequency ƒa is 0.1 kHz for all-digital modes and 12 kHz for operating modes designed to work on the same loop as a voice band service such as POTS.

Note 2: Frequency ƒb is the frequency at which the PSD mask is approximately 30 dB below the peak mask value. The ƒb values for various VDSL2 upstream PSD masks are given in Table 3.5(b).

Note 3: If a 3 kHz measurement bandwidth is used rather than the 4 kHz bandwidth on which the requirements are based, a 1.3 dB correction factor for the smaller measurement bandwidth is applied to the maximum longitudinal output voltage limits, thus decreasing −50 dBV limits to −51.3 dBV and −80 dBV limits to −81.3 dBV respectively.

Table 3.5(b): Values of ƒb for Various VDSL2 Upstream PSD Masks
POTS
Designator
All-Digital Mode
Designator
ƒb (kHz)
Table 3.5(c): Maximum Longitudinal Output Voltage (LOV) for Technologies Other Than VDSL2
Interface Applicable
Frequency
Range
Max. LOV (dBVrms)
Averaged Over 1 s in
All 4 kHz Frequency
Bands
Max. LOV (dBVrms)
Averaged over 1 s in
All 3 kHz Frequency
BandsNote 4
over POTS (Notes 1 and 2)
10 < ƒ < ƒb

ƒb < ƒ < 4fb
−50

−80
−51.3

−81.3
all-digital mode(Notes 2 and 3)
0.1 < ƒ< ƒb

ƒb < ƒ < 4fb
−50

−80
−51.3

−81.3
SDSL, SHDSL,
ESHDSL
Operating Band

From upper −30 dB
(relative to peak PSD)
frequency to 4× the
upper −30 dB
frequency
−50

−80
−51.3

−81.3
HDS2, HDSL4 Operating Band

From upper −30 dB
(relative to peak PSD)
frequency to 4× the
upper −30 dB
frequency
−5

−80
−51.3

−81.3

Note 1: The first frequency band is the operating band limited by the frequency point ƒb, the frequency at which the PSD is approximately 30 dB below the peak mask value. For ADSL modems that do not support extended upstream operation, this frequency is 211 kHz, so the maximum frequency to which the longitudinal output voltage is measured in the upper band is 844 kHz.

Note 2: Alternatively, the measured 30 dB points may be used to define the operating band’s lower and upper frequency points.

Note 3: The first frequency band is the operating band limited by the frequency point ƒb, the frequency at which the PSD is approximately 30 dB below the peak mask value. See Table 3.5(d) for the values of ƒb frequencies.

Note 4: This option includes a −1.3 dB correction factor associated with using a 3 kHz bandwidth rather than the ideal 4 kHz bandwidth.

Table 3.5(d): Values of ƒb for Various All-Digital Mode Extended Upstream PSD Masks
Upstream
All-Digital
Mode
Designator
ƒb (kHz) ƒb (kHz)
(With 48 dB/Octave Between ƒ1 and ƒ2)

### Figure 3.5: Measurement Method for Longitudinal Voltage

Description of Figure 3.5

Figure 3.5 describes the test circuit to measure and record the true rms longitudinal voltage in all 4 kHz frequency bands for compliance with longitudinal output voltage limits. The maximum numerical values for longitudinal output voltage for VDSL2 terminal equipment is provided in Tables 3.5(a) and for technologies other than VDSL2 in Table 3.5(c).

Note 1: These resistors to be matched better than 0.1% tolerance.

Note 2: NT refers to network termination.

top of page

## Annex A — Deployment Guidelines

To ensure spectral compatibility with other xDSL technologies deployed in the loop plant (i.e. to avoid third-party harm), ADSL, ADSL2, ADSL2+, HDSL2, SDSL, SHDSL, HDSL4, VDSL and VDSL2 systems should not be deployed on loops longer than the equivalent working length (EWL) identified below:

Table A1(a): Deployment Guidelines
xDSL Maximum EWL
HDSL2 3200 m (10 500 ft)
2B1Q SDSL See Table A1(c)
SHDSL See Table A1(d)

The EWL is defined as:

EWL = L26 + 0.75 (L24) + 0.60 (L22) + 0.40 (L19)

where:

L26 is the length of 26 AWG cable;
L24 is the length of 24 AWG cable;
L22 is the length of 22 AWG cable; and
L19 is the length of 19 AWG or larger gauge cable in the assigned loop.

Any xDSL transceiver using asymmetric spectra (ADSL, HDSL2, HDSL4) shall not be installed with a transceiver (TU-C) transmitting in the downstream frequency band (ADSL: 138-1,104 kHz; HSDL2: 0−440 kHz; HDSL4: 0−600 kHz) located at the customer end of the loop (customer premises).

The administrative procedures to be used by local exchange carriers or other service providers to ensure that systems are installed on loops meeting these deployment guidelines are beyond the scope of this document.

Table A1(b): Deployment Guidelines for ADSL2 All-Digital Mode Range Extended Upstream
Number
Designator
1 ADLU−32 > 4725 m (15.5 kft)
2 ADLU−36 3353 m (11.0 kft)
3 ADLU−40 3201 m (10.5 kft)
4 ADLU−44 3048 m (10.0 kft)
5 ADLU−48 2896 m (9.5 kft)
6 ADLU−52 2896 m (9.5 kft)
7 ADLU−56 2744 m (9.0 kft)
8 ADLU−60 2744 m (9.0 kft)
9 ADLU−64 2744 m (9.0 kft)
Table A1(c): Deployment Guidelines for 2B1Q SDSL
PSD Maximum 2B1Q SDSL
Line Bit Rate (kbps)
2B1Q SDSL
Deployment Guideline,
EWL
SDSLu (ƒ) with ƒsym = 160000 320 4725 m (15.5 kft)
SDSLu (ƒ) with ƒsym = 168000 336 4420 m (14.5 kft)
SDSLu (ƒ) with ƒsym = 192000 384 4115 m (13.5 kft)
SDSLu (ƒ) with ƒsym = 200000 400 4115 m (13.5 kft)
SDSLu (ƒ) with ƒsym = 208000 416 3965 m (13 kft)
SDSLu (ƒ) with ƒsym = 232000 464 3810 m (12.5 kft)
SDSLu (ƒ) with ƒsym = 264000 528 3660 m (12 kft)
SDSLu (ƒ) with ƒsym = 296000 592 3505 m (11.5 kft)
SDSLu (ƒ) with ƒsym = 328000 656 3355 m (11 kft)
SDSLu (ƒ) with ƒsym = 360000 720 3200 m (10.5 kft)
SDSLu (ƒ) with ƒsym = 392000 784 3050 m (10 kft)
SDSLu (ƒ) with ƒsym = 456000 912 2895 m (9.5 kft)
SDSLu (ƒ) with ƒsym = 488000 976 2745 m (9 kft)
SDSLu (ƒ) with ƒsym = 552000 1104 2590 m (8.5 kft)
SDSLu (ƒ) with ƒsym = 616000 1232 2440 m (8 kft)
SDSLu (ƒ) with ƒsym = 712000 1424 2285 m (7.5 kft)
SDSLu (ƒ) with ƒsym = 840000 1680 2135 m (7 kft)
SDSLu (ƒ) with ƒsym = 936000 1872 1980 m (6.5 kft)
SDSLu (ƒ) with ƒsym = 1064000 2128 1830 m (6 kft)
SDSLu (ƒ) with ƒsym = 1128000 2256 1675 m (5.5 kft)
SDSLu (ƒ) with ƒsym = 1160000 2320 1525 m (5 kft)
Table A1(d): Deployment Guidelines for SHDSL
SHDSL Line Bit Rate (LBR) (kbps) SHDSL Deployment Guideline, EWL
LBR < 592 All non-loaded loops
600 < LBR < 616 4770 m (15.0 kft)
624 < LBR < 628 4420 m (14.5 kft)
656 < LBR < 688 4265 m (14.0 kft)
696 < LBR < 800 4115 m (13.5 kft)
808 < LBR < 832 3810 m (12.5 kft)
840 < LBR < 896 3660 m (12.0 kft)
904 < LBR < 952 3965 m (13.0 kft)
960 < LBR < 1000 3810 m (12.5 kft)
1008 < LBR < 1088 3660 m (12.0 kft)
1096 < LBR < 1160 3505 m (11.5 kft)
1168 < LBR < 1320 3355 m (11.0 kft)
1328 < LBR < 1472 3200 m (10.5 kft)
1480 < LBR < 1536 3050 m (10.0 kft)
1544 < LBR < 1552 3200 m (10.5 kft)
1560 < LBR < 1664 3050 m (10.0 kft)
1672 < LBR < 1880 2895 m (9.5 kft)
1888 < LBR < 2008 2745 m (9.0 kft)
2016 < LBR < 2320 2590 m (8.5 kft)

top of page

## Annex B — Informative References

1. T1.417 — 2001: Spectrum Management for Loop Transmission Systems
2. ITU-T Recommendation K.50, G.992.3, G.992.5, G.993.2
3. T1 TRQ — XX: Technical Requirements for Maximum Voltage, Current and Power Levels for Network-Powered Transport Systems
4. CAN/CSA-C22.2 No. 60950-00: Safety of Information Technology Equipment
5. T1.424/Trial-UseInterface Between Networks and Customer Installations—Very-high Speed Digital Subscriber Lines (VDSL) Metallic Interface
6. T1E1.4/2002-002 — Draft proposed American National Standard, Spectrum Management for Loop Transmission Systems, Issue 2
Date modified: