1、 ANSI/CEA Standard Emergency Alert Messaging for Cable ANSI J-STD-42-B (CEA-814-B) October 2013 NOTICE Consumer Electronics Association (CEA) Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunderstandings between manufacturers an
2、d 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 preclude a
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8、e of the CEA R4.3 Television Data Systems Subcommittee.) Published by CONSUMER ELECTRONICS ASSOCIATION 2013 Technology Phone 202-872-9160; Fax 202-872-9161; Internet http:/www.atsc.org/ IEC Standards: Global Engineering Documents, World Headquarters, 15 Inverness Way East, Englewood, CO USA 80112-57
9、76; Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email IEC Central Office, 3, rue de Varembe, PO Box 131, CH-1211 Geneva 20, Switzerland; Phone +41 22 919 02 11; Fax +41 22 919 03 00; Internet http:/www.iec.ch; Email pubinforiec.ch ITU Standards: International Telecommunications Union, Pl
10、ace des Nationas, CH-1211 Geneva 20, Switzerland; Phone +41 22 730 5111; Fax +41 22 733 7256; Internet http:/www.itu.ch/publications/bookstore.html Email itumailitu.int 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/
11、rules.html J-STD-42-B 3 SCTE Standards: Society of Cable Telecommunications Engineers (SCTE), 140 Philips Road, Exton PA 19341; Phone 800-542-5040; Fax 610-363-5898; Internet http:/www.scte.org; Email infoscte.org IEEE Standards: Global Engineering Documents, World Headquarters, 15 Inverness Way Eas
12、t, Englewood, CO USA 80112-5776; Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email 3.2 Informative References 3.2.1 Informative Reference List 11 ATSC A/53, Digital Television Standard, Advanced Television Systems Committee. 12 ANSI/SCTE 65, Service Information Delivered Out-of-Band for
13、Digital Cable Television 13 IEEE OUI Registration Authority 14 OASIS Common Alerting Protocol v1.2 1 July 2010 (http:/docs.oasis-open.org/emergency/cap/v1.2/CAP-v1.2-os.pdf) 15 FEMA Common Alerting Protocol, v. 1.2 USA Integrated Public Alert and Warning System Profile Version 1.0 - 13 October 2009
14、(“IPAWS CAP Profile v1.0) (http:/docs.oasis-open.org/emergency/cap/v1.2/ipaws-profile/v1.0/cap-v1.2-ipaws-profile-v1.0.pdf 16 EAS-CAP Industry Group (ECIG) Recommendations for a CAP EAS Implementation Guide (ECIG-IG-1.0) - May 17, 2010 (http:/www.eas-cap.org/ECIG-CAP-to-EAS_Implementation_Guide-V1-0
15、.pdf) 17 ANSI/SCTE 164 2010, Emergency Alert Metadata Descriptor, Society of Cable Telecommunications Engineers. 3.2.2 Informative Reference Acquisition ATSC Standards: Advanced Television Systems Committee (ATSC), 1750 K Street N.W., Suite 1200, Washington, DC 20006; Phone 202-872-9160; Fax 202-872
16、-9161; Internet http:/www.atsc.org/ IEEE OUI Registration Authority: http:/standards.ieee.org/regauth/oui/index.shtml SCTE Standards: Society of Cable Telecommunications Engineers (SCTE), 140 Philips Road, Exton PA 19341; Phone 800-542-5040; Fax 610-363-5898; Internet http:/www.scte.org; Email infos
17、cte.org 4 Compliance Notation As used in this standard, “shall” denotes a mandatory provision 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
18、 implementer. “Optional” denotes items that may or may not be present in a compliant implementation. 5 Emergency Alert Message (Normative) The cable_emergency_alert() message shall be delivered out-of-band (Extended Channel per ANSI/SCTE 28 5) to the receiving device in packets identified with the S
19、I_base_PID value of 0x1FFC (per SCTE 28 4 Section 8.9.1). For transport streams carrying one or more programs in the clear, the cable_emergency_alert() message shall be delivered to the receiving device in the MPEG-2 2 transport stream for that channel in packets identified with the base_PID value o
20、f 0x1FFB. The syntax of the cable_emergency_alert() message that shall be used is defined in Table 1. Acronyms uimsbf, bslbf, and rpchof are as defined in ISO/IEC 13818-1 2 Section 2.2.6. J-STD-42-B 4 The MPEG-2 table_ID for this message is 0xD8. Refer to ISO/IEC 13818-1 2 MPEG-2 systems for a descr
21、iption of the fields common to the MPEG-2 private section syntax. The cable_emergency_alert() message is limited to 4096 bytes maximum length, which means that the section_length field may have a maximum value of 4093 decimal. table_IDThis is an 8-bit field which shall be set to 0xD8, identifying th
22、is table as the cable_emergency_alert() message. section_syntax_indicatorThis 1-bit field shall be set to 1. It denotes that the table section follows the generic MPEG-2 section syntax beyond the section_length field zeroThis 1-bit field shall be set to 0. J-STD-42-B 5 Syntax Bits Description cable_
23、emergency_alert() table_ID 8 uimsbf value 0xD8 section_syntax_indicator 1 1 zero 1 0 reserved 2 11 section_length 12 uimsbf table_id_extension 16 uimsbf 0x0000 reserved 2 11 sequence_number 5 uimsbf current_next_indicator 1 bslbf section_number 8 uimsbf last_section_number 8 uimsbf protocol_version
24、8 uimsbf EAS_event_ID 16 uimsbf EAS_originator_code 24 uimsbf three ASCII characters EAS_event_code_length 8 uimsbf EAS_event_code var uimsbf nature_of_activation_text_length 8 uimsbf nature_of_activation_text() var uimsbf alert_message_time_remaining 8 uimsbf seconds range 0120 event_start_time 32
25、uimsbf event_duration 16 uimsbf minutes range 156000 reserved 12 bslbf alert_priority 4 uimsbf details_OOB_source_ID 16 uimsbf reserved 6 111111 details_major_channel_number 10 uimsbf reserved 6 111111 details_minor_channel_number 10 uimsbf audio_OOB_source_ID 16 uimsbf alert_text_length 16 uimsbf a
26、lert_text() var Per ATSC A/65C 1, Sec. 6.10 location_code_count 8 uimsbf range 131 for (i=0; ilocation_code_count; i+) state_code 8 uimsbf range 099 county_subdivision 4 uimsbf range 09 reserved 2 11 county_code 10 uimsbf range 0999 exception_count 8 uimsbf for (i=0; iexception_count; i+) in_band_re
27、ference 1 bslbf reserved 7 1111111 if (in_band_reference) reserved 6 111111 exception_major_channel_number 10 uimsbf reserved 6 111111 exception_minor_channel_number 10 uimsbf else reserved 16 bslsbf exception_OOB_source_ID 16 uimsbf reserved 6 111111 descriptors_length 10 uimsbf for (i=0; iN; i+) d
28、escriptor() var Optional CRC_32 32 rpchof Table 1 Emergency Alert Message Format J-STD-42-B 6 reservedFields in this standard marked reserved shall not be assigned by the creator of the message, but shall be available for future use. Receiving devices are expected to disregard reserved fields for wh
29、ich no definition exists that is known to that unit. Each bit in the fields marked reserved shall be set to one until such time as they are defined and supported. section_length12-bit field specifying the number of remaining bytes in this section immediately following the section_length field up to
30、the end of the section. The value of the section_length shall be no larger than 4093. table_id_extensionThis 16-bit field shall be set to zero (0x0000). sequence_numberThis 5-bit field is the sequence number of this cable_emergency_alert() message. The sequence_number shall be incremented by 1 (modu
31、lo 32), when any change occurs in the information carried in the cable_emergency_alert() message. Receiving devices process the sequence_number in order to detect and discard duplicate transmissions. Duplicates of any alert may be sent to overcome possible message loss due to channel noise. When the
32、 last-used sequence_number is known, generating equipment shall increment sequence_number by one (modulo 32) when any data in the alert message changes. In case the last-used sequence_number is unknown (which can occur if a new piece of equipment is brought on line), generating equipment shall send
33、an Emergency Alert with alert_priority zero to establish a new sequence_number in all receiving devices before sending any actual alerts. current_next_indicatorThis 1-bit indicator shall always be set to 1 indicating that the table sent is always currently applicable. section_numberThe value of this
34、 8-bit field shall always be 0x00 (this table shall be at most one section long). last_section_numberThe value of this 8-bit field shall always be 0x00. protocol_versionAn 8-bit unsigned integer field whose function is to allow, in the future, this table type to carry parameters that may be structur
35、ed differently than those defined in the current protocol. At present, the only valid value for protocol_version is zero. EAS_event_ID-A 16-bit value that shall identify the particular Emergency Alert event. Each time a new EAS message is distributed throughout the cable system, a new EAS_event_ID s
36、hall be assigned. A new EAS_event_ID shall be assigned if any parameter defining the event changes; that is, any field following the EAS_event_ID itself, excluding the alert_message_time_remaining field. NOTEAn Emergency Alert event with EAS_event_ID value A may be followed later by another event wi
37、th EAS_event_ID value B. Since B represents a change to the contents of the cable_emergency_alert() message, the sequence_number for B is incremented. The notification of event A could then be repeated, with the sequence_number incremented yet again. As long as no aspect of event A was changed, the
38、originally assigned EAS_event_ID value for that event could be used for the repeat notification. Receiving devices that had seen and processed the original event A, could then recognize this as a repetition and discard it. NOTEDesign consideration should be given to initial acquisition of a cable_em
39、ergency_alert() table section. EAS_originator_codeThe EAS originator code defined by 47 C.F.R. Part 11 3 as ORG codes, indicating the entity that originally initiated the activation of the EAS. Receiving devices process the cable_emergency_alert() message for any value in this field. Processing of t
40、he EAS_originator_code in receiving devices is optional, but may be used with EAS_event_code to trigger various alarms or attention-J-STD-42-B 7 getting behavior in the equipment. EAS_originator_code is coded as three ASCII characters. “Originator” codes defined in 47 C.F.R. 11.31(d) 3 are reprinted
41、 in Table 2. EAS_originator_code Meaning PEP Primary Entry Point System WXR National Weather Service CIV Civil Authorities EAS Broadcast station or cable system Table 2 EAS FCC-Defined Originator Code (Informative) EAS_event_code_length An 8-bit unsigned integer that shall indicate the length in byt
42、es of the EAS_event_code field to follow. EAS_event_codeThe EAS event code defined by 47 C.F.R. Part 11 3 as “Event” (EEE) codes, indicating the nature of the EAS activation. Receiving devices process the cable_emergency_alert() message for any value in this field. Processing of the EAS_event_code i
43、n receiving devices is optional, but may be used to trigger various alarms or attention-getting behavior in the equipment beyond handling the mandatory actions required by the cable_emergency_alert() message. EAS_event_code shall be coded as n ASCII characters, where n is given by EAS_event_code_len
44、gth. “Event” codes defined in 47 C.F.R. 11.31(e) 3 are reprinted in Table 3. J-STD-42-B 8 EAS_ event_ code Nature of Activation National Codes: EAN Emergency Action Notification (National only) EAT Emergency Action Termination (National only) Deprecated (Note 1) NIC National Information Center RMT R
45、equired Monthly Test RWT Required Weekly Test NPT National Periodic Test Local Codes: ADR Administrative Message HLS Hurricane Statement1 (Note 2) AVW Avalanche Warning LEW Law Enforcement Warning AVA Avalanche Watch LAE Local Area Emergency BZW Blizzard Warning NMN Network Message Notification CAE
46、Child Abduction Emergency TOE 911 Telephone Outage Emergency CDW Civil Danger Warning NUW Nuclear Power Plant Warning CEM Civil Emergency Message DMO Practice/Demo Warning CFW Coastal Flood Warning RHW Radiological Hazard Warning CFA Coastal Flood Watch SVR Severe Thunderstorm Warning DSW Dust Storm
47、 Warning SVA Severe Thunderstorm Watch EQW Earthquake Warning SVS Severe Weather Statement EVI Evacuation Immediate SPW Shelter in Place Warning FRW Fire Warning SMW Special Marine Warning FFW Flash Flood Warning SPS Special Weather Statement FFA Flash Flood Watch TOR Tornado Warning FFS Flash Flood
48、 Statement TOA Tornado Watch FLS Flood Statement TRW Tropical Storm Warning FLW Flood Warning TRA Tropical Storm Watch FLA Flood Watch TSW Tsunami Warning HMW Hazardous Materials Warning TSA Tsunami Watch HWW High Wind Warning VOW Volcano Warning HWA High Wind Watch WSW Winter Storm Warning HUW Hurr
49、icane Warning (Note 2) WSA Winter Storm Watch HUA Hurricane Watch (Note 2) NOTES 1. In 2012, the FCC deprecated the Emergency Action Termination (EAT) and deleted it from Part 11. Continued use of the EAT EAS_event_code in this protocol is allowed. 2. In Pacific Ocean regions, hurricanes are known as typhoons. In Indian Ocean regions, hurricanes are known as cy
