1、 ANSI/CEA Standard Emergency Alert Metadata for the Home Network ANSI/CEA-2035 (J-STD-070) April 2010 NOTICE Consumer Electronics Association (CEA) Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunderstandings between manufactur
2、ers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Bulletins and other technical publications shall not in any respect prec
3、lude any member or nonmember of CEA from manufacturing or selling products not conforming to such Standards, Bulletins or other technical publications, nor shall the existence of such Standards, Bulletins and other technical publications preclude their voluntary use by those other than CEA members,
4、whether the standard is to be used either domestically or internationally. Standards, Bulletins and other technical publications are adopted by CEA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, CEA does not assume any liability to any patent owner
5、, nor does it assume any obligation whatever to parties adopting the Standard, Bulletin or other technical publication. This CEA Standard is considered to have International Standardization implication, but the International Electrotechnical Commission activity has not progressed to the point where
6、a valid comparison between the CEA Standard and the IEC document can be made. This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and hea
7、lth practices and to determine the applicability of regulatory limitations before its use. (Formulated under the cognizance of the CEAs R8 Cable Compatability.) Published by CONSUMER ELECTRONICS ASSOCIATION 2009 Technology Phone: 202.628.6380; Fax: 202.393.5453; Internet: https:/www.atis.org/docstor
8、e/default.aspx; E-mail: atispratis.org. 2.2 Informative References The following standards contain provisions that, through reference in this text, constitute informative provisions of the appropriate sections of this standard. At the time of publication, the editions indicated were valid. All stand
9、ards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying for the most recent editions of the standards listed in Sec. 2.2.1. 2.2.1 Informative Reference List 2 ANSI J-STD-042-A, Emergency Alert Messaging for Cable, Novem
10、ber 2007. Also known as SCTE 18 2007. 3 ATIS-0800007, IPTV High Level Architecture, Alliance for Telecommunications Industry Solutions, 2007. 4 ATIS-0800010, Emergency Alert Provisioning Specification, Alliance for Telecommunications Industry Solutions, 2008. 5 Common Alerting Protocol (CAP) v1.1, O
11、ASIS Standard CAP-V1.1, October 2005, http:/www.oasis-open.org/committees/download.php/15135/emergency-CAPv1.1-Corrected_DOM.pdf http:/docs.oasis-open.org/emergency/cap/v1.1/errata/approved/CAP-v1.1-errata.pdf 6 6 ANSI/CEA-2009-A, Receiver Performance Specification for Public Alert Receivers, Consum
12、er Electronics Association, October 2005. 7 FIPS 6-4, Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas, August 31, 1990, with minor editorial corrections of January 2005. http:/www.itl.nist.gov/fipspubs/fip6-4.htm 8 FCC Rules, 47 C.F.R. Part 11, Emergency
13、Alert System (EAS) (revised as of 11/10/2005) 2.2.2 Informative Reference Acquisition ANSI Standards: United States of America CEA-2035/DVS-847 2J-STD-070 American National Standards Institute, Customer Service, 11 West 42nd Street, New York NY 10036; Phone: 212-642-4900; Fax 212-302-1286; Internet:
14、 http:/www.ansi.org; E-mail: salesansi.org. ATIS - Alliance for Telecommunications Industry Solutions, Inc. Alliance for Telecommunications Industry Solutions, 1200 G Street, NW, Suite 500, Washington, D.C. 20005; Ph: 202.628.6380; Fax: 202.393.5453; Internet: https:/www.atis.org/docstore/default.as
15、px; E-mail: atispratis.org. OASIS Standards: Organization for the Advancement of Structured Information Standards (OASIS); Internet: http:/www.oasis-open.org/. CEA Standards: Global Engineering Documents, World Headquarters, 15 Inverness Way East, Englewood, CO USA 80112-5776; Phone 800-854-7179; Fa
16、x 303-397-2740; Internet http:/ ; Email . FCC Rules U.S. Code of Federal Regulations (C.F.R.), U.S. Government Printing Office, Washington, D.C. 2040; http:/www.fcc.gov/wtb/rules.html 2.3 Definitions For the purposes of this standard, the following definitions apply. Details Channel A source of live
17、, streaming audio/video programming that contains emergency alert information. The Details Channel is delivered as a Single Program Transport Stream, containing possibly multiple (multilingual) audio tracks. Exception Channel A channel that receiving devices are not expected to tune away from in an
18、emergency. It may contain alert information equivalent to the Details Channel, thus fulfilling the function of a forced acquisition of a Details Channel. The service providers designation of a channel as an Exception Channel is limited to the set of audio/video sources provided by that service provi
19、der. Commercial Video Service Sources of audio/video content provided as live or on-demand streams coming into the home from a service provider. 2.4 Symbols and Abbreviations ANSI American National Standards Institute ATIS Alliance for Telecommunications Industry Solutions A/V Audio/Video CEA Consum
20、er Electronics Association DLNA Digital Living Network Alliance DMP Digital Media Player DMR Digital Media Renderer DMS Digital Media Server DTV Digital Television CEA-2035/DVS-847 3J-STD-070 DVR Digital Video Recorder EAS Emergency Alert System FEMA Federal Emergency Management Agency FIPS Federal
21、Information Processing Standard IIF IPTV Interoperability Forum ITF IPTV Terminal Function NOAA National Oceanographic and Atmospheric Administration OASIS Organization for the Advancement of Structured Information Standards PTF Protocol Translator Function SAME Specific Area Message Encoding SCTE S
22、ociety of Cable Telecommunications Engineers SP Service Provider WAN Wide area network XML Extensible Markup Language 2.5 Compliance Notation As used in this document, “shall” and “must” denote a mandatory provisions of the standard. “Should” denotes a provision that is recommended but not mandatory
23、. “May” denotes a feature whose presence does not preclude compliance that may or may not be present at the option of the implementer. “Optional” denotes items that may or may not be present in a compliant implementation. 3. BACKGROUND (INFORMATIVE) The following section describes ways in which emer
24、gency alert information may arrive in the consumer domain. Next, the different pieces of emergency alert data that may be delivered are described. 3.1 Distribution of Emergency Alert Information to Consumer Devices Emergency alerts are federally mandated for radio and television broadcasting in the
25、US, and are defined for digital cable and devices marketed as “digital-cable-ready.” Figure 1 is a block diagram of a distribution system showing delivery of EAS information to the consumer domain, with different receiving devices in the home forwarding that information to a home network. As shown,
26、there are several sources of EAS information, including those emanating from telco, satellite, and cable service providers. A functional block called a Protocol Translator Function (PTF) connects to commercial video services on the WAN provided by a Service Provider (SP), and performs any protocol t
27、ranslations needed to allow it to act as a Digital Media Server (DMS) to offer these services or a subset of these services to clients in the home network. The PTF itself likely does not have any disk storage or decoding/rendering capability or any audio/video direct output for display. CEA-2035/DVS
28、-847 4J-STD-070 Figure 1 Delivery of Emergency Alert Information into the Consumer Domain As shown in Figure 1, the EAS Encoder-Decoder is responsible for collecting EAS source messages from governmental agencies or weather services such as National Oceanographic and Atmospheric Administration (NOAA
29、). The SP may add data pertinent to the operation of their system which delivers the EAS signaling messages to consumers. The FCC has indicated their intent to shift from the current audio tone-based signaling method to a method based on the XML-based OASIS CAP v1.1 5 protocol. In Figure 1, the PTF
30、(Protocol Translation Function) is an entity that can function to extend the commercial video services offered by a Service Provider (including EAS) to the home network. The PTF can perform protocol translation on multiple network layers. For IPTV services in the United States, Alliance for Telecomm
31、unications Industry Solutions (ATIS) IPTV Interoperability Forum (IIF) has published a set of specifications for the delivery of EAS signaling and content to consumer devices. ATIS-0800010, Emergency Alert Provisioning Specification 4 provides a system-level description of EAS functionality in the I
32、PTV network, including required functionality of consumer-domain IPTV devices. ATIS-0800012, IPTV Emergency Alert System Metadata Specification 1, specifies the associated EAS metadata in XML format. CEA-2035/DVS-847 5J-STD-070 The EAS signaling and content are delivered via IP multicast on an ATIS
33、IIF-compliant IPTV network spanning from the SP to multiple ATIS IIF-defined IPTV Terminal Function (ITF) devices in the home. The ATIS XML schema for EAS is based on CAP v1.1 5, with additions and exceptions as needed for the IPTV application and signaling to consumer devices. ATIS IIF includes a P
34、TF block in its high level architecture to allow connectivity to a home network. As described in the ATIS IIF High Level Architecture 3 specification, a PTF includes ITF functionality and can reside on any device in the home network. ATIS IIF specifications do not address the functionality of the PT
35、F. Protocols defined by ATIS IIF specifications provide delivery of IPTV services, including audio/video and emergency alerts, to ITF devices in the home. Independently, using the same home network physical infrastructure, commercial audio/video and emergency alerts may be delivered to client device
36、s in the home via standard protocols such as those being defined by the Digital Network Living Alliance (DLNA) using devices compliant with such guidelines and following the recommendations given in the present document. CEA-2035/DVS-847 includes almost all the same data as the ATIS EAS signaling me
37、ssage defined in ATIS-0800012, IPTV Emergency Alert System Metadata Specification 1. The ANSI J-STD-042-A 2 standard, Emergency Alert Messaging for Cable contains similar data. Data provided by ANSI-J-STD-042-A 2 can be used by the cable terminal, with appropriate mapping of metadata elements, to cr
38、eate EAS signaling in accordance with CEA-2035/DVS-847. A/V services offered by a satellite provider can be made available on the home network in a similar fashion. Note that Figure 1 shows that in the case of commercial video arriving via terrestrial broadcast, separate EAS signaling data is not av
39、ailable for distribution to the home network. However the audio/video contents from terrestrial broadcast sources might be placed on the network. A viewer watching any consumer device capable of receiving and processing an off-air terrestrial broadcast signal (directly or over a local home network)
40、has access to all emergency alert information and announcements simply by viewing program video and listening to program audio. As of the date of publication of this standard, there is no standard method for signaling emergency alert information in a machine-readable format within DTV terrestrial br
41、oadcast. 3.2 Public Alert Receivers Readers should be aware that ANSI/CEA-2009-A Receiver Performance Specification for Public Alert Receivers 6 defines minimum performance criteria for consumer electronic products designed to receive Specific Area Message Encoding (SAME) alert signals broadcast by
42、the National Oceanic and Atmospheric Administrations Weather Radio network and Environment Canadas Meteorological Services of Canada Radio network. ANSI/CEA-2009-A lists a number of alert Event Codes that may be encountered that are not available from other sources. As defined by FEMA, the designate
43、d responsible government office for EAS, Specific Area Message Encoding is simply a category title. SAME consists of approximately 2200 FIPS codes (and 1200 equivalent codes in Canada called CFIPS) which define geographic targeting data. 3.3 The Need for Emergency Alert Signaling in the Home Network
44、 Figure 2 diagrams a PTF and DMS feeding commercial video services to a home network, where a Digital Media Renderer (or Player) receives them. This particular PTF includes a video display output as well as PVR functionality. CEA-2035/DVS-847 6J-STD-070 Protocol Translator Function (PTF)General Stor
45、ageDelay BufferDirect ContentAudio/Video DecodeContent ProtectionService Provider WANDigital Media Renderer/PlayerGeneral StorageDelay BufferDirect ContentAudio/Video DecodeHDMIContent Dir.Svc.Content ProtectionDetails Channel Content ProtectionHome NetworkContent ProtectionDetails ChannelHDMIFigure
46、 2 Emergency Alerts in the Home Network In response to emergency alert signaling from the Service Provider, the PTF may acquire a Details Channel and switch its audio/video display output to that feed. In other situations, it may substitute real-time alert audio for program audio (whether from a liv
47、e feed or via playback from disk storage). In yet other cases, it may overlay alert text on the video output. On the right hand side in Figure 2 is a Digital Media Renderer or Player (DMR/DMP) with connectivity through the home network to the PTF/DMS. This client device also has DVR functionality. T
48、he desired response to an emergency alert event is the same in the DMR/DMP as it is in the PTF/DMS: depending on the type of alert, the audio/video output from the DMR/DMP is augmented with alert information: text, alert audio, or Details Channel audio/video (or a combination of these). The emergenc
49、y alert signaling defined in CEA-2035/DVS-847 allows the DMR/DMP to respond to the alert event and produce the same user experience as he or she would have had with the PTF/DMS. 3.4 Overview of Emergency Alert Metadata The following definitions of elements of emergency alert information are conveyed in the metadata of this standard. Note that some elements are optional; others must always be present, while others must be conditionally present. Textual items may be delivered multilingually. AlertAudio
