ANSI SCTE 164-2019 pdf free download – Emergency Alert Metadata Descriptor.
1.0 SCOPE AND INTRODUCTION This document defines a container usable by cable system operators for the delivery of Emergency Alert (EA) metadata into the consumer domain. This metadata is designed to support cable set-top terminals which function as servers of “commercial video services” (CVS) into the home network, by providing preformatted XML-based EA data required by such Digital Media Servers (DMS) in the home. The container, specified as being in the form of an ANSI J-STD-042-B [2] descriptor, is defined only for carriage within the emergency alert signaling message defined in ANSI J-STD-042-B [2]. The metadata carried in the descriptor includes metadata elements conforming to ANSI J-STD-070 [1], which is the standard delivery format for XML-formatted EA data in the home network. Users of this standard should be aware that EAS is a topic which is subject to regulation and is currently under consideration by the Federal Emergency Management Agency (FEMA).
2.0 NORMATIVE REFERENCES
The following documents contain provisions, which, through reference in this text, constitute provisions of the standard. At the time of Subcommittee approval, the editions indicated were valid. All standards are subject to revision; and while parties to any agreement based on this standard are encouraged to investigate the possibility of applying the most recent editions of the documents listed below, they are reminded that newer editions of those documents may not be compatible with the referenced version.
[1] ANSI J-STD-070, Emergency Alert Signaling for the Home Network, a Joint Standard developed by SCTE {published as ANSI/SCTE 162 2009} and CEA{published as CEA 2035}.)
[2] ANSI J-STD-042-B Emergency Alert Messaging for Cable, a Joint Standard developed by SCTE {published as ANSI/SCTE 18 2013} and CEA {published as CEA 814-B}.)
This document contains symbolic references to syntactic elements used in the video and transport coding subsystems. These references are typographically distinguished by the use of a different font (e.g., reserved ), may contain the underscore character (e.g., constraint_set0_flag ) and may consist of character strings that are not English words (e.g., pic_width_in_mbs_minus1 ).
4.0 DEFINITIONS AND ACRONYMS
4.1 Acronyms
The following definitions and acronyms are used in this document:
ANSI American National Standards Institute
ATIS Association for Telecommunications Industry Solutions
CEA Consumer Electronics Association
DMS Digital Media Server
DTV Digital Television
EA Emergency Alert
EAS Emergency Alert System
IEC International Electrotechnical Commission
IIF IPTV Interoperability Forum
IP Internet Protocol
IPTV IP Television
STB Set Top Box
UCS Unicode Conversion Support
uimsbf unsigned integer most significant bit first
UTF-8 8-bit UCS/Unicode Transformation Format
XML eXtensible Markup Language
4.2 Numerical Formats
This document uses the conventions shown in Table 1 for the representation of numerical values.
5.0 EMERGENCY ALERT METADATA DESCRIPTOR (NORMATIVE) This section normatively defines the syntax and semantics of the Emergency Alert Metadata Descriptor, and specifies normative requirements for its contents. The bit stream syntax of the Emergency Alert Metadata Descriptor shall be as shown in Table 2. When used, one or more instances of this descriptor shall appear in the cable_emergency_alert() data structure defined in ANSI J- STD-042- [2], each as an instance of descriptor
descriptor_tag – This 8-bit unsigned integer field shall be set to 0x03 to identify the descriptor as being the Emergency Alert Metadata Descriptor in the context of its carriage within the cable_emergency_alert() data structure defined in ANSI J-STD-042-B [2].ANSI SCTE 164 pdf download