1、 ATIS-0800010 ATIS Standard on - EMERGENCY ALERT PROVISIONING SPECIFICATIONS The Alliance for Telecommunication Industry Solutions (ATIS) is a technical planning and standards development organization that is committed to rapidly developing and promoting technical and operations standards for the co
2、mmunications and related information technologies industry worldwide using a pragmatic, flexible and open approach. Over 1,100 participants from over 300 communications companies are active in ATIS 22 industry committees and its Incubator Solutions Program. Notice of Disclaimer Released July 12, 200
3、7.44 ATIS-0800002, IPTV Architecture Requirements, March 31, 2006.55 ATIS-0800012, IPTV Emergency Alert System Metadata Specification, due 2008.66 ATIS-0800013, Media Protocols Specification, due 2008.77 ATIS-0800014, Secure Download and Messaging Interoperability Specification, March 2008.48 ATIS-0
4、800019, Multicast Network Service Specification, due 2008.89 Federal Information Processing Standards Publication 6-4, Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas, 31 August 1990, with editorial corrections January 2005.92.2 Informative References 10
5、ANSI J-STD-042-A, Emergency Alert Message for Cable, November 2007.1011 Broadcasting Public Notice CRTC-2007-20, Emergency alert services, February 28, 2007.113This document is available from the Federal Communications Commission. 4This document is available from the Electronic Code of Federal Regul
6、ations. 5This document is available from the Alliance for Telecommunications Industry Solutions, 1200 G Street N.W., Suite 500, Washington, DC 20005. 6This document is not yet finalized. 7Ibid. 8Ibid. 9This document is available from the Information Technology Laboratory. 10This document is availabl
7、e as SCTE 18 2007 from the Society of Cable Telecommunications Engineers. 11This document is available from the Canadian Radio-Television and Telecommunications Commission (CRTC). ATIS-0800010 3 3 DEFINITIONS, ACRONYMS, however, in the public interest, the IPTV architecture should support all of the
8、 alert types defined in the FCC rules. 4.2.1 Emergency Action Notification (EAN) The Emergency Action Notification (EAN) is the notice to all EAS participants and to the general public that the EAS has been activated for a national emergency. 12The information in this section is derived primarily fr
9、om EB Docket 04-296, First Report and Order and Further Notice of Proposed Rulemaking, Review of the Emergency Alert System, November 10, 2005; and the Code of Federal Regulations (CFR) Title 47 part 11 Telecommunications, Emergency Alert System, October 1, 2005. 13Second Report and Order and Furthe
10、r Notice of Proposed Rulemaking, op.cit.; pp. 1; Appendix C, #8. ATIS-0800010 6 4.2.2 Emergency Action Termination (EAT) The Emergency Action Termination (EAT) is the notice to all EAS Participants and to the general public that the EAN has terminated. 4.2.3 Required Weekly Test (RWT) and Required M
11、onthly Test (RMT) The purpose of the Required Weekly Test and Required Monthly Test EAS messages is to ensure the proper functionality of the EAS system. 4.2.4 Alert Message Types There are three basic types of alert messages discussed here: text-only, audio-plus-text, and forced-acquisition. The in
12、terruption to programming caused by text-only and audio-plus-text types are typically limited to two minutes duration, although the alert may be dismissed by user action. If a message has been dismissed by the user, that same message should not be displayed again. The interruption caused by a forced
13、-acquisition alert type may extend indefinitely. It is terminated by user action or by the arrival and processing of an alert with a fixed end time - a presidential alert (EAN) channel override and a text overlay with an audio alert. All of these alert messages will override current activity and not
14、 just linear video viewing. For example, a user could be in an IPTV menu, playing a game, or watching a DVR recording and a presidential national-level alert would cause a channel change to a given linear channel that would carry the presidential alert audio and video. Other types of alerts would ty
15、pically provide a text message bar overlaying the on-screen activity that is occurring on the ITF, although in some emergency situations a forced-acquisition to a channel providing detailed information regarding the event could also be sent. Such a channel is called the Details channel. The expectat
16、ion is that the system will use the standard EAS audio Attention Tone, but a different alert sound may be used. Audio is provided either in streaming format on a referenced multicast address (i.e., for the forced acquisition type) or in a referenced file that is retrieved and played back in the ITF
17、(i.e., text plus audio alert type). 4.3 Primary Entry Point (PEP) System The Primary Entry Point System (PEP) is a nationwide network of broadcast stations and other entities connected with government activation points. It is used to distribute the EAN, EAT, and EAS national test messages as well as
18、 other EAS messages. EAS alerts are distributed through a relay chain of radio and TV sources. Each member of the chain is either an origination point and/or a relay point. The alert information is distributed in a standard message format that is encoded as an analog audio signal, which reduces the
19、complexity of relaying this information. The EAS Designations are as follows: a) National Primary (NP) - A source of EAS presidential messages. b) Local Primary (LP) - A source of EAS local area messages. An LP source is responsible for coordinating the carriage of common emergency messages from sou
20、rces such as the National ATIS-0800010 7 Weather Service or local emergency management offices as specified in its EAS local area plan. c) State Primary (SP) - A source of EAS state messages. These messages can originate from the governor or a designated representative in the State Emergency Operati
21、ng Center or state capital. Messages are sent via the State Relay Network. d) State Relay (SR) - A source of EAS State Messages. It is part of the State Relay Network and relays national and state common emergency messages into the local area. 4.3.1 Location Codes The FCC Mapbook is based on state p
22、lans and local area plans that contain procedures for officials to transmit emergency information to the public in their respective areas during an emergency. Location codes indicate the geographic area affected by the EAS alert. The Location Code uses the Federal Information Processing Standard (FI
23、PS) numbers as described by the U.S. Department of Commerce in the National Institute of Standards and Technology publication FIPS PUB 6-4 9. The state, territory, and offshore areas are represented by two digit FIPS number codes. Counties within each state are represented by three-digit FIPS number
24、 codes. For US territories and possessions, county-equivalents are used (examples: muncipio in Puerto Rico and districts/island names in American Samoa). Emergency alerts can be targeted to sub-areas with a county (or island, muncipio, district, etc.). FCC Part 11 defines a parameter identifying cou
25、nty subdivisions as follows: 0 = all or an unspecified portion of a county, 1 = Northwest, 2 = North Central, 3 = Northeast, 4 = West Central, 5 = Central, 6 = East Central, 7 = Southwest, 8 = South Central, 9 = Southeast. 4.4 Originator Codes Originator codes indicate who originally initiated the a
26、ctivation of the EAS. The only currently defined originator codes are as shown in Table 1. Table 1: Originator Codes Originator ORG Code EAS Participant EAS Civil Authorities CIV National Weather System WXR Primary Entry Point System PEP 4.5 Event Codes Event codes indicate the nature of the EAS act
27、ivation. They are represented by three alphabetical characters and must be compatible with the codes used by the NWS Weather Radio Specific Area Message Encoder (WRSAME). The FCC Report and Order which became effective May 16, 2002, established naming conventions for EAS event codes. Currently, four
28、 types of events are defined: ATIS-0800010 8 1. WARNINGS - A WARNING is an event that alone poses a significant threat to public safety and/or property, probability of occurrence and location is high, and the onset time is relatively short. 2. WATCHES - A WATCH meets the classification of a warning,
29、 but either the onset time, probability of occurrence, or location is uncertain. 3. EMERGENCIES - An EMERGENCY is an event that, by itself, would not kill or injure or do property damage, but indirectly may cause other things to happen that result in a hazard. For example, a major power or telephone
30、 loss in a large city alone is not a direct hazard, but disruption to other critical services could create a variety of conditions that could directly threaten public safety. 4. STATEMENTS - A STATEMENT is a message containing follow up information to a warning, watch, or emergency. Table 2 shows th
31、e currently defined event codes: ATIS-0800010 9 Table 2: EAS Event Codes Code Message (National Alerts) EAN Emergency Action Notification EAT Emergency Action Termination NIC National Information Center NPT National Periodic Test RMT Required Monthly Test RWT Required Weekly Test (State and Local Al
32、erts ) ADR Administrative Message AVW1 Avalanche Warning BZW Blizzard Warning CAE1 Child Abduction Emergency CDW1 Civil Danger Warning CEM Civil Emergency Message CFW1 Coastal Flood Warning CFA1 Coastal Flood Watch DSW1 Dust Storm Warning EQW1 Earthquake Warning EVI Evacuation Immediate FRW1 Fire Wa
33、rning FFW Flash Flood Warning FFA Flash Flood Watch FLW Flood Warning FLA Flood WatchFLS Flood Statement HMW1 Hazardous Materials Warning HWW High Wind Warning HWA High Wind Watch HUW Hurricane Warning HLS Hurricane Statement LEW1 Law Enforcement Warning LAE1 Local Area Emergency NMN1 Network Messag
34、e Notification TOE1 911 Telephone Outage Emergency NUW1 Nuclear Power Plant Warning DMO Practice/Demo Warning RHW1 Radiological Hazard Warning SVR Severe Thunderstorm Warning SVA Severe Thunderstorm Watch SVS Severe Weather Statement SPW1 Shelter in Place Warning SMW1 Special Marine Warning SPS Spec
35、ial Weather Statement TOR Tornado Warning TOA Tornado Watch TRW1 Tropical Storm Warning TRA1 Tropical Storm Watch TSW Tsunami Warning TSA Tsunami Watch VOW1 Volcano Warning WSW Winter Storm Warning WSA Winter Storm Watch ATIS-0800010 10 4.6 Alert Identifiers For the IPTV application, the emergency a
36、lert message provided by the service provider to consumer-domain devices may be labeled with an Alert Identifier, which is a textual or numeric label unique to each alert event. The Alert Identifier may be used by receiving devices to identify a given alert message as a duplicate transmission of a p
37、reviously-processed alert. This allows the ITF to avoid re-displaying previously displayed alert messages. 4.7 Test Messages and Alert Priority In the ANSI-J-STD-042 cable standard 10, an alert is associated with a five-level alert priority value - low, three intermediate levels, and high. Level zer
38、o is the lowest priority, and is typically used for test messages. Consumer receiving devices are required to disregard priority-zero alert messages, but commercial equipment can register and respond to these to validate proper delivery of emergency alert metadata to consumers. The highest-level set
39、ting for alert priority in the digital cable standard indicates the alert must interrupt any activity currently underway in the consumer receiver, including the viewing of pay-per-view (PPV) or Video on Demand (VOD) content. Three levels of intermediate priority are also defined in the cable standar
40、d. This priority signaling scheme was originally designed only to distinguish test-type alerts from regular alerts. Such a designation would allow the operator to cause a consumer receiving device to disregard test messages while commercial test equipment would process (and perhaps log) them. Howeve
41、r, during the development of the standard, the definition of the alert priority was expanded to include intermediate priority levels. This was done to allow the operator to target alerts to receiving devices operating in certain conditions. That is, an intermediate alert priority value might indicat
42、e that regular “free” linear broadcasting programs be interrupted, but would not interrupt premium services, such as PPV or VOD programs. It is important to note that the various priority levels in the cable standard have nothing to do with the severity of the alert being issued. The cable priority
43、values only distinguish between test alert and between the types of programming that should be interrupted by an alert. If an emergency alert is to be issued to the population of consumer subscribers living in a certain area, it is not clear how such an alert could be important enough to interrupt f
44、ree services but not urgent enough to interrupt subscribers who are enjoying PPV or VOD services. Therefore, the concept of alert priority in this IPTV standard is simplified to three levels: test, normal, and high. The setting for the test alert priority, which is one type of EAS event, means that
45、the ITF must count the messages received for diagnostic purposes, but not display the alert message. The test priority level may be used by the operator for internal testing where the operator does not want to interrupt consumer viewing. The setting for the normal alert priority is assigned by the o
46、perator to EAS events where customers can choose whether or not to view the event. EAS events with normal alert priority may or may not interrupt any current activity underway in the ITF, depending on operator default setting and possible user override of the default setting. Examples of these types
47、 of EAS events would be the Required Weekly Test (RWT)/Required Monthly Test (RMT) messages or local and state administrative messages. It should be noted that the FCC or other governmental agencies may issue rulings disallowing certain types of alerts (such as RMT/RWT) from being designated as norm
48、al priority. If that were to happen, operators would need to send them at high priority. ATIS-0800010 11 The setting for high alert priority in this IPTV standard indicates that the EAS event must interrupt any activity currently underway in the ITF, including the viewing of PPV or VOD content and a
49、ny other displayed alert. 4.8 EAS Protocol for Radio and Television Broadcasts The EAS protocol described in FCC 47 CFR Part 11 defines a four-part message for an emergency activation of the EAS for use in radio and television broadcasts. The four parts are: 1. Preamble and EAS Header Codes; 2. Audio Attention Signal; 3. Message; and 4. Preamble and EAS End of Message (EOM) Codes. The Preamble and EAS Codes use Audio Frequency Shift Keying at a rate of 520.83 bits per second to transmit the codes. Mark frequency is 2083.3 Hz and space frequen
