Spectrum Management and Telecommunications

Next

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

Issue 9, Amendment 4, May 2009

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

Contents

CS-03, Part VIII - Requirements and Tests Methods for Digital Subscriber Line (xDSL) Terminal Equipment
(PDF, 625 KB, 82 pages)

To access the Portable Document Format (PDF) version, you must have a PDF reader installed. If you do not already have such a reader, there are numerous PDF readers available for free download or for purchase on the Internet:

1.0 Introduction

1.1 Scope

This part sets forth the minimum network protection requirements for:

  • Asymmetrical Digital Subscriber Line terminal equipment (TE) using either Carrierless Amplitude Phase modulation or Discrete Multi-Tone technology;
  • Asymmetrical Digital Subscriber Line transceivers -2 (ADSL2);
  • Asymmetrical Digital Subscriber Line transceivers - Extended Bandwidth ADSL2 (ADSL2+);
  • Reach Extend Asymmetrical Digital Subscriber Line transceivers (READSL);
  • High bit rate Digital Subscriber Line TE using either Carrierless Amplitude Phase modulation or "2 Binary 1 Quaternary" line code (HDSL [CAP/2B1Q]);
  • High bit rate Digital Subscriber Line 2nd generation TE using Trellis Coded Pulse Amplitude Modulation (HDSL2 [TC-PAM]);
  • Symmetrical Digital Subscriber Line TE using "2 Binary 1 Quaternary" line code (SDSL [2B1Q]);
  • Single pair High-Speed Digital Subscriber Line TE using Trellis Coded Pulse Amplitude Modulation (SHDSL [G.shdsl - TC-PAM]);
  • 4-wire High bit rate Digital Subscriber Line 2nd generation TE using Trellis Coded Pulse Amplitude Modulation (HDSL4 [TC-PAM]);
  • Very-high-bit-rate Digital Subscriber Line (VDSL) terminal equipment using either a single-carrier modulation (QAM) or a multi-carrier modulation (DMT).
  • Very high-speed digital subscriber line2 (VDSL2) terminal equipment using discrete multi-tone (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 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 for the ADSL2 functional reference model.

HDSL equipment provides equal bit rate in both directions (downstream and upstream). Both channels can be supported on the same cable pair (1 pair HDSL) or one channel per cable pair (2 pair HDSL).

Two HDSL channels are equivalent to a T1 structure. Baseband voice signals cannot be carried simultaneously with data. Refer to Figure 1.2 for the HDSL 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 1.2 for the HDSL2 reference model.

2B1Q SDSL has the same symbol rate, baud rate, and power spectral density at both STU-C and STU-R transceivers. 2B1Q SDSL system may vary its data rate from 64 kbps to 2320 kbps. Refer to Figure 1.2 for the 2B1Q SDSL reference model. Typically, 2B1Q SDSL equipment transmits a symmetric signal on a single copper pair.

SHDSL uses Trellis Coded Pulse Amplitude Modulation (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 1.2 for the SHDSL reference model.

HDSL4 is a variant of SHDSL, using TC-PAM on 2 copper pairs (4 wires) to transmit an asymmetric signal with a data rate of 768/776 kbps. Refer to Figure 1.2 for the HDSL4 reference model.

VDSL is an xDSL technology designed to support very-high-speed data transmission over relatively short twisted-pair loops, which simultaneously support POTS (plain old telephone service). The system will support 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 up to 30 MHz.

Table 1.1: 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 above 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.

Figure 1.1: TE Functional Reference Model for ADSL, ADSL2, ADSL2+, READSL, VDSL and VDSL2

Figure 1.1: TE Functional Reference Model for ADSL, ADSL2, ADSL2+, READSL, VDSL and VDSL2

Note:
TU-C = ADSL/ADSL2/ADSL2+/READSL/VDSL/VDSL2 transceiver unit, central office end
TU-R = ADSL/ADSL2/ADSL2+/READSL/VDSL/VDSL2 transceiver unit, remote terminal end
PSTN = Public Switched Telephone Network
POTS = Plain Old Telephone Service


Figure 1.2: TE Functional Reference Model for HDSL, HDSL2, SDSL, SHDSL, and HDSL4

Figure 1.2: TE Functional Reference Model for HDSL, HDSL2, SDSL, SHDSL, and HDSL4

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

1.2 Technical Requirements

XDSL terminal equipment connected to the U-R interface shall comply with the following technical requirements.

Table 1.2: Technical Requirements Table
Section Technical Requirements
2 Electrical and Mechanical Stresses
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 shall be performed in the following order:

  1. Section 1.4 Connecting Arrangements
  2. Section 1.5 Operational Check
  3. Section 2.2 (Part I) Dielectric Strength
  4. Section 2.3 (Part I) Hazardous Voltage Limitations (As applicable)
  5. Section 3.0 Network Protection Requirements and Tests
  6. Section 2.1 (Part I) Mechanical Shock
  7. Section 2.4 (Part I) Surge Voltage
  8. Section 2.5 (Part I) Power Line Surge
  9. Section 1.5 Operational Check
  10. Section 2.2 (Part I) Dielectric Strength
  11. Section 2.3 (Part I) Hazardous Voltage Limitations (As applicable)
  12. Section 3.0 Network Protection Requirements and Tests

1.4 Connecting Arrangements

Cords and plugs of xDSL TE intended for direct electrical connection to the public switched network shall comply with Part III.

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 Section 3.0. When the operational checks are repeated after the electrical stress of Section 2.0, it is permissible that the TE be partially or fully inoperable.

2.0 Electrical and Mechanical Stresses

The technical requirements and methods of application for electrical and mechanical stresses are given in Part I, Section 2.0.

Next