1、 International Telecommunication Union ITU-T G.9964TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (12/2011) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Access networks In premises networks Unified high-speed wireline-based home networking transceivers Power spectral densi
2、ty specification Recommendation ITU-T G.9964 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARA
3、CTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRAN
4、SMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTE
5、RISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 In premises networks G.9950G.9999For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.9964 (12/2011) i Recommendation ITU-T G.
6、9964 Unified high-speed wireline-based home networking transceivers Power spectral density specification Summary Recommendation ITU-T G.9964 specifies the control parameters that determine spectral content, power spectral density (PSD) mask requirements, a set of tools to support reduction of the tr
7、ansmit PSD, means to measure this PSD for transmission over telephone wiring, power line wiring and coaxial cable, as well as the allowable total transmit power into a specified termination impedance. It complements the system architecture and physical layer (PHY) specification in Recommendation ITU
8、-T G.9960, and the data link layer (DLL) specification in Recommendation ITU-T G.9961, as well as the modifications and additions to these Recommendations specifying the multiple input/multiple output (MIMO) home networking transceiver in Recommendation ITU-T G.9963. History Edition Recommendation A
9、pproval Study Group 1.0 ITU-T G.9964 2011-12-16 15 ii Rec. ITU-T G.9964 (12/2011) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standar
10、dization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), whic
11、h meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within IT
12、U-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendatio
13、n is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “mu
14、st“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation m
15、ay involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of th
16、is Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent databas
17、e at http:/www.itu.int/ITU-T/ipr/. ITU 2012 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.9964 (12/2011) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 1 4 Abbreviations and a
18、cronyms 2 5 Transmit PSD mask 3 5.1 Sub-carrier masking 3 5.2 Power spectral density shaping 4 5.3 Notching of international amateur radio bands 5 5.4 Power spectral density ceiling 5 5.5 Notching of VDSL2 bands . 5 6 Medium-dependent specification of spectral content . 5 6.1 Specification of spectr
19、al content for telephone lines 5 6.2 Specification of spectral content for power lines . 7 6.3 Specification of spectral content for coax 9 6.4 Termination impedance 13 6.5 Total transmit power . 14 6.6 Receiver input impedance 14 Annex A 15 Annex B 16 Annex C 17 Annex D International amateur radio
20、bands . 18 Annex E Impact of ITU-T G.9960 on VDSL2 service . 19 Appendix I Additional radio frequency bands 20 Bibliography. 22 Rec. ITU-T G.9964 (12/2011) 1 Recommendation ITU-T G.9964 Unified high-speed wireline-based home networking transceivers Power spectral density specification 1 Scope This R
21、ecommendation specifies the control parameters that determine spectral content, power spectral density (PSD) mask requirements, a set of tools to support reduction of the transmit PSD, means to measure this PSD for transmission over telephone wiring, power line wiring and coaxial cable, as well as t
22、he allowable total transmit power into a specified termination impedance. It complements the system architecture and physical layer (PHY) specification in ITU-T G.9960, and the data link layer (DLL) specification in ITU-T G.9961 as well as the modifications and additions to these Recommendations spe
23、cifying the multiple input/multiple output (MIMO) home networking transceiver in ITU-T G.9963. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the
24、 editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently
25、 valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T G.9960 Recommendation ITU-T G.9960 (2011), Unified high-speed wireline-based home networking transceivers Sys
26、tem architecture and physical layer specification. ITU-T G.9961 Recommendation ITU-T G.9961 (2010), Unified high-speed wireline-based home networking transceivers Data link layer specification. ITU-T G.9963 Recommendation ITU-T G.9963 (2011), Unified high-speed wireline-based home networking transce
27、ivers Multiple input/multiple output specification. 3 Definitions This Recommendation defines the following terms: 3.1 bandplan: A specific range of the frequency spectrum that is associated with only one domain. Multiple bandplans may be used in the same domain provided that any bandplan is either
28、a subset or a superset of all other bandplans in the same domain. The bandplan is defined by a lower frequency and upper frequency except for radio frequency (RF), which is defined by a bandwidth and centre frequency. 3.2 baseband: A frequency band defined by an up-convert frequency FUC= 0 and an up
29、-shift frequency FUS= FSCN/2 (see Table 7-67 of ITU-T G.9960). 3.3 domain: A part of an ITU-T G.9960 home network comprising the domain master and all those nodes that are registered with the same domain master. In the context of this Recommendation, use of the term “domain“ without a qualifier mean
30、s “ITU-T G.9960 domain“, and use of the term “alien domain“ means “non-ITU-T G.9960 domain“. Additional qualifiers (e.g., “power-line“) may be added to either “domain“ or “alien domain“. 2 Rec. ITU-T G.9964 (12/2011) 3.4 domain master (DM): A node supporting the domain master functionality that mana
31、ges (coordinates) all other nodes of the same domain (i.e., assigns bandwidth resources and manages priorities). Only one active domain master is allowed in a domain, and all nodes within a domain are managed (coordinated) by a single domain master. If a domain master fails, another node of the same
32、 domain, capable of operating as a domain master, should pick up the function of the domain master. 3.5 home network: Two or more nodes that can communicate with each other either directly or through a relay node at the physical layer, or through an inter-domain bridge above the physical layer. A ho
33、me network consists of one or more domains. In the context of this Recommendation, use of the term “home network“ means “ITU-T G.9960 home network“. Use of the term “alien home network“ means “non-ITU-T G.9960 home network“. Use of the term “network“ without a qualifier means any combination of “ITU
34、-T G.9960 home network“, “non-ITU-T G.9960 home network“ and “access network“. Use of the term “alien network“ means any combination of “non-ITU-T G.9960 home network“ and “access network“. 3.6 medium: A wire-line facility, of a single wire class, allowing physical connection between nodes. Nodes co
35、nnected to the same medium may communicate on the physical layer, and may interfere with each other unless they use orthogonal signals (e.g., different frequency bands, different time periods). 3.7 node: Any network device that contains an ITU-T G.9960 transceiver. In the context of this Recommendat
36、ion, use of the term “node“ without a qualifier means “ITU-T G.9960 node“, and use of the term “alien node“ means “non-ITU-T G.9960 node“. Additional qualifiers (e.g., “relay“) may be added to either “node“ or “alien node“. 3.8 passband: A frequency band defined by an up-convert frequency FUC= 0 and
37、 an up-shift frequency FUS FSCN/2 (see Table 7-67 of ITU-T G.9960). 3.9 radio frequency (RF): A frequency band defined by an up-convert frequency FUC 0 and a centre frequency FC= FUC+ FUS FSCN/2 (see Tables 7-67 and 7-68 of ITU-T G.9960). 3.10 sub-carrier (OFDM sub-carrier): The centre frequency of
38、each OFDM sub-channel onto which bits may be modulated for transmission over the sub-channel. 3.11 sub-channel (OFDM sub-channel): A fundamental element of OFDM modulation technology. The OFDM modulator partitions the channel bandwidth into a set of parallel sub-channels. 3.12 wire class: One of the
39、 classes of wire, having the same general characteristics: coaxial cable, home electrical-power wire, phone-line wire and Category 5 cable. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: BB BaseBand CB Coax Baseband CRF Coax Radio Frequency DM Domain
40、Master LPM Limit PSD Mask OFDM Orthogonal Frequency Division Multiplexing PB Power-line Baseband PHY Physical Layer Rec. ITU-T G.9964 (12/2011) 3 PSD Power Spectral Density PSDC PSD Ceiling PSM PSD Shaping Mask RF Radio Frequency RPM Regional PSDM Mask SM Sub-carrier Mask 5 Transmit PSD mask Transmi
41、t PSD mask (TxPSD) is determined by a sub-carrier mask (SM), a PSD shaping mask (PSM), a notching of international amateur radio bands defined in this clause, the limit PSD mask (LPM) defined for each particular medium, and a regional PSD mask (RPM) if specified in a regional annex (see ITU-T G.9960
42、). The same TxPSD shall be applied to all nodes in the domain. For an ITU-T G.9960 transceiver, the PSD of the transmit signal at any frequency shall never exceed the transmit PSD mask. For an ITU-T G.9963 transceiver, the sum of PSDs of the two transmit signals transmitted from the two Tx ports at
43、any frequency shall never exceed the TxPSD. The PSD of the transmit signal may be further limited by a PSD ceiling (PSDC) that is applied to nodes involved in a particular connection (clause 5.4). The LPM (see clauses 6.1.2, 6.2.2 and 6.3.2) specifies the absolute limit of the transmit PSD. However,
44、 if an RPM is specified for a particular region, the absolute limit shall be the minimum level between the LPM and RPM at any given frequency. The SM, PSDC, and PSM provide further reduction and shaping of the transmit PSD using three mechanisms: sub-carrier masking (notching), PSD ceiling (limit on
45、 PSD level), and PSD shaping. ITU-T G.9960 and ITU-T G.9963 transceivers shall support sub-carrier masking, notching of international amateur radio bands, and PSD ceiling. Support of PSD shaping is optional. The transmit PSD mask shall comply with national and regional regulatory requirements. The L
46、PM is defined based on the assumption that measurements are made using equipment conforming to b-IEC CISPR 16-1 specifications using an RMS detector with a “maximum hold“ function and using a resolution bandwidth of 9 kHz for frequencies below 30 MHz and 120 kHz for frequencies above 30 MHz. In orde
47、r to conform to b-IEC CISPR 22 and make reliable measurements, ITU-T G.9960 transceivers shall be active at least 10% of the time and sustain the transmit power level for a minimum of 250 ms. NOTE In addition to the mechanisms described in this clause that provide absolute limits to the transmit PSD
48、 (both in-band and out-of-band), this Recommendation defines a mechanism of PSD ceiling that allows dynamic reduction of the transmit power for each particular connection to the minimum value that is sufficient to achieve the given QoS targets. 5.1 Sub-carrier masking Sub-carrier masking shall be us
49、ed to eliminate transmission on one or more sub-carriers. Sub-carrier masking is defined by a sub-carrier mask (SM). The transmit power of sub-carriers specified in SM shall be set to zero (linear scale). The SM shall override all other instructions related to the transmit power of the sub-carrier. The SM is defined as a number of masked frequency bands. Each band is specified by a start sub-carrier index (xL) and a stop sub-carrier index (xH), as xL, xH. An SM including S bands can be represented in the
