ANSI CTA-2035-2010 pdf download Emergency Alert Metadata for the Home Network
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. “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 emergency 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 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, 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 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. In Figure 1 , the PTF (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.