ANSI SCTE 162-2019 pdf free download – Emergency Alert Signaling for the Home Network.
2.5Compliance 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.“May”denotes a featurewhose presence does not preclude compliance that may or may not be present at the option of theimplementer.“Optional”denotes items that may or may not be present in a compliantimplementation.
3.BACKGROUND (INFORMATIVE)
The following section describes ways in which emergency alert information may arrive in theconsumer domain.Next, the different pieces of emergency alert data that may be delivered aredescribed.
3.1Distribution of Emergency Alert Information to Consumer Devices
Emergency alerts are federally mandated for radio and television broadcasting in the US, and aredefined for digital cable and devices marketed as “digital-cable-ready.”Figure 1 is a block diagram ofa distribution system showing delivery of EAS information to the consumer domain, with differentreceiving devices in the home forwarding that information to a home network.As shown, there areseveral sources of EAS information, including those emanating from telco, satellite, and cable serviceproviders.
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 translations 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.
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). 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.
ln Figure l, the PTF(Protocol Translation Function) is an entity that can function to extend thecommercial video services offered by a Service Provider (including EAS) to the home network.ThePTF can perform protocol translation on multiple network layers.
For IPTV services in the United States，Alliance for Telecommunications Industry Solutions (ATIS)IPTV Interoperability Forum (IlF) has published a set of specifications for the delivery of EASsignaling and content to consumer devices. ATIS-0800010，Emergency Alert ProvisioningSpecification [4] provides a system-level description of EAS functionality in the IPTV network,including required functionality of consumer-domain IPTV devices.ATIS-0800012,IPTV EmergencyAlert System Metadata Specification [1], specifies the associated EAS metadata in XML format.
The EAS signaling and content are delivered via lP multicast on an ATIS llF-compliant IPTVnetwork spanning from the SP to multiple ATIS IIF-defined IPTV Terminal Function (ITF) devices inthe home. The ATIS XML schema for EAS is based on CAP v1.1 [5], with additions and exceptionsas needed for the IPTV application and signaling to consumer devices.
ATIS IIF includes a PTF block in its high level architecture to allow connectivity to a home network.As described in the ATIS lIF High Level Architecture [3] specification,a PTF includcs ITFfunctionality and can reside on any device in the home network. ATIS lIF specifications do notaddress the functionality of the PTF.
Protocols defined by ATIS lIF specifications provide delivery of IPTV services,including audio/videoand emergency alerts, to TF devices in the home. Independently，using the same home networkphysical infrastructure，commercial audio/video and emergency alerts may be delivered to clientdevices in the home via standard protocols such as those being defined by the Digital Network LivingAlliance(DLNA) using devices compliant with such guidelincs and following the recommendationsgiven in the present document.
SCTE 162 includes almost all the same data as the ATIS EAS signaling message 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 tcrminal, with appropriate mapping of metadata clements, tocreatc EAS signaling in accordance with SCTE 162.ANSI SCTE 162 pdf download.