{"id":49703,"date":"2018-09-19T10:13:58","date_gmt":"2018-09-19T08:13:58","guid":{"rendered":"http:\/\/www.easyais.com\/en\/?p=49703"},"modified":"2020-02-13T13:48:58","modified_gmt":"2020-02-13T11:48:58","slug":"ais-know-how-data-transfer-sotdma-vs-cstdma","status":"publish","type":"post","link":"https:\/\/www.easyais.com\/en\/news\/technical-news\/ais-know-how-data-transfer-sotdma-vs-cstdma\/","title":{"rendered":"AIS Know-How: Data transfer (SOTDMA vs. CSTDMA)"},"content":{"rendered":"

[et_pb_section fb_built=”1″ _builder_version=”3.22″][et_pb_row _builder_version=”3.25″ background_size=”initial” background_position=”top_left” background_repeat=”repeat”][et_pb_column type=”4_4″ _builder_version=”3.25″ custom_padding=”|||” custom_padding__hover=”|||”][et_pb_text _builder_version=”3.27.4″]Since the end of 2000, the Automatic Identification System<\/a> (AIS) has become a binding standard to improve the navigation and safety at sea.<\/span> Position, course, speed, and other ship data are transmitted alternately on the two maritime VHF channels 161.975 MHz and 162.025 MHz.<\/span> Per minute there are 2,250 Slots available for the transmission of AIS data telegrams.<\/span><\/span><\/p>\n

Two methods are available for transmitting the AIS data telegrams.
\nOn the one hand, the CSTDMA (Carrier Sense Time-Division Multiple Access)<\/strong> method, which is used primarily for pleasure boating (Class B). The CSTDMA method uses carrier-sensing to defer transmissions until no other stations are transmitting.<\/span> If a free slot is found, the transmission starts. Than the transmission is stopped for a 30 second time interval before the next one starts<\/span>.
\nOn the other hand, there is the SOTDMA (Self-Organized Time-Division Multiple Access)<\/strong> technology, which was used only by commercial vessels (Class A) but is now also authorized<\/span> for pleasure boating at Class B level. With the SOTDMA method only the first free slot for the transmission has to be found<\/span><\/span>. The next five slots are always reserved automatically.
\n<\/span><\/span><\/p>\n

The following hierarchy results for the transmission of AIS data telegrams:<\/span><\/p>\n

    \n
  1. Class A (commercial vessels) & SART (rescue transmitter)<\/span><\/li>\n
  2. Class B SOTDMA (pleasure boating)<\/span><\/li>\n
  3. Class B CSTDMA (pleasure boating)<\/span><\/span><\/li>\n<\/ol>\n

     <\/p>\n

    The main advantages of the SOTDMA compared to the CSTDMA technology for pleasure boating (Class B) at a glace:<\/span><\/span>
    \n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”3.25″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” column_structure=”1_2,1_2″][et_pb_column type=”1_2″ _builder_version=”3.25″ custom_padding=”|||” custom_padding__hover=”|||”][et_pb_pricing_tables admin_label=”SOTDMA” _builder_version=”3.16″ button_text_size__hover_enabled=”off” button_one_text_size__hover_enabled=”off” button_two_text_size__hover_enabled=”off” button_text_color__hover_enabled=”off” button_one_text_color__hover_enabled=”off” button_two_text_color__hover_enabled=”off” button_border_width__hover_enabled=”off” button_one_border_width__hover_enabled=”off” button_two_border_width__hover_enabled=”off” button_border_color__hover_enabled=”off” button_one_border_color__hover_enabled=”off” button_two_border_color__hover_enabled=”off” button_border_radius__hover_enabled=”off” button_one_border_radius__hover_enabled=”off” button_two_border_radius__hover_enabled=”off” button_letter_spacing__hover_enabled=”off” button_one_letter_spacing__hover_enabled=”off” button_two_letter_spacing__hover_enabled=”off” button_bg_color__hover_enabled=”off” button_one_bg_color__hover_enabled=”off” button_two_bg_color__hover_enabled=”off”][et_pb_pricing_table featured=”on” title=”SOTDMA (Class B)” subtitle=”Self-organized Time-Division Multiple Access” _builder_version=”3.16″ button_on_hover=”on” border_color_all=”#003d8f” button_text_size__hover_enabled=”off” button_one_text_size__hover_enabled=”off” button_two_text_size__hover_enabled=”off” button_text_color__hover_enabled=”off” button_one_text_color__hover_enabled=”off” button_two_text_color__hover_enabled=”off” button_border_width__hover_enabled=”off” button_one_border_width__hover_enabled=”off” button_two_border_width__hover_enabled=”off” button_border_color__hover_enabled=”off” button_one_border_color__hover_enabled=”off” button_two_border_color__hover_enabled=”off” button_border_radius__hover_enabled=”off” button_one_border_radius__hover_enabled=”off” button_two_border_radius__hover_enabled=”off” button_letter_spacing__hover_enabled=”off” button_one_letter_spacing__hover_enabled=”off” button_two_letter_spacing__hover_enabled=”off” button_bg_color__hover_enabled=”off” button_one_bg_color__hover_enabled=”off” button_two_bg_color__hover_enabled=”off”]+ 5 watt transmission power<\/span><\/span><\/p>\n

    + Transmission interval up to every 15 sec. (depending on speed)<\/span><\/span><\/p>\n

    + Reservation of future slots<\/span><\/span><\/p>\n

    + Sending\/receiving of text messages (addressing to MMSI possible)<\/span><\/span><\/p>\n

    + 2nd priority to Class A devices<\/span><\/span>
    \n[\/et_pb_pricing_table][\/et_pb_pricing_tables][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”3.25″ custom_padding=”|||” custom_padding__hover=”|||”][et_pb_pricing_tables admin_label=”CSTDMA” _builder_version=”3.16″ button_text_size__hover_enabled=”off” button_one_text_size__hover_enabled=”off” button_two_text_size__hover_enabled=”off” button_text_color__hover_enabled=”off” button_one_text_color__hover_enabled=”off” button_two_text_color__hover_enabled=”off” button_border_width__hover_enabled=”off” button_one_border_width__hover_enabled=”off” button_two_border_width__hover_enabled=”off” button_border_color__hover_enabled=”off” button_one_border_color__hover_enabled=”off” button_two_border_color__hover_enabled=”off” button_border_radius__hover_enabled=”off” button_one_border_radius__hover_enabled=”off” button_two_border_radius__hover_enabled=”off” button_letter_spacing__hover_enabled=”off” button_one_letter_spacing__hover_enabled=”off” button_two_letter_spacing__hover_enabled=”off” button_bg_color__hover_enabled=”off” button_one_bg_color__hover_enabled=”off” button_two_bg_color__hover_enabled=”off”][et_pb_pricing_table title=”CSTDMA (Class B)” subtitle=”Carrier Sense Time-Division Multiple Access” _builder_version=”3.16″ button_on_hover=”on” button_text_size__hover_enabled=”off” button_one_text_size__hover_enabled=”off” button_two_text_size__hover_enabled=”off” button_text_color__hover_enabled=”off” button_one_text_color__hover_enabled=”off” button_two_text_color__hover_enabled=”off” button_border_width__hover_enabled=”off” button_one_border_width__hover_enabled=”off” button_two_border_width__hover_enabled=”off” button_border_color__hover_enabled=”off” button_one_border_color__hover_enabled=”off” button_two_border_color__hover_enabled=”off” button_border_radius__hover_enabled=”off” button_one_border_radius__hover_enabled=”off” button_two_border_radius__hover_enabled=”off” button_letter_spacing__hover_enabled=”off” button_one_letter_spacing__hover_enabled=”off” button_two_letter_spacing__hover_enabled=”off” button_bg_color__hover_enabled=”off” button_one_bg_color__hover_enabled=”off” button_two_bg_color__hover_enabled=”off”]+ 2 watt transmission power<\/span><\/span><\/p>\n

    + Send interval every 30 sec. (fixed)<\/span><\/span><\/p>\n

    + no<\/strong> reservation of future slots<\/span><\/span><\/p>\n

    + no<\/strong> sending\/receiving of text messages<\/span><\/span><\/p>\n

    + 3rd priority to Class A devices<\/span><\/span>
    \n[\/et_pb_pricing_table][\/et_pb_pricing_tables][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ fullwidth=”on” _builder_version=”3.22″][et_pb_fullwidth_header title=”For more safety at sea – switch to SOTDMA Class B technology now!” button_two_text=”easyTRX3″ button_two_url=”https:\/\/www.easyais.com\/en\/products\/a20000-easytrx3-sotdma\/” logo_image_url=”https:\/\/www.easyais.com\/en\/wp-content\/uploads\/sites\/5\/2018\/08\/easyTRX3-SOTDMA_A20000_Preview.png” _builder_version=”4.3.2″ background_color=”#003d8f” hover_enabled=”0″ button_one_text_size__hover_enabled=”off” button_two_text_size__hover_enabled=”off” button_one_text_color__hover_enabled=”off” button_two_text_color__hover_enabled=”off” button_one_border_width__hover_enabled=”off” button_two_border_width__hover_enabled=”off” button_one_border_color__hover_enabled=”off” button_two_border_color__hover_enabled=”off” button_one_border_radius__hover_enabled=”off” button_two_border_radius__hover_enabled=”off” button_one_letter_spacing__hover_enabled=”off” button_two_letter_spacing__hover_enabled=”off” button_one_bg_color__hover_enabled=”off” button_two_bg_color__hover_enabled=”off”][\/et_pb_fullwidth_header][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"

    Advantages SOTDMA to CSTDMA:
    \n+ 5 watt transmission power
    \n+ Transmission interval up to every 15 sec. (depending on speed)
    \n+ Reservation of future slots
    \n+ Sending\/receiving of text messages (addressing to MMSI possible)
    \n+ 2nd priority to Class A devices<\/p>\n","protected":false},"author":2,"featured_media":49704,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[183],"tags":[39,194,195,193],"class_list":["post-49703","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-news","tag-ais","tag-cstdma","tag-datatelegram","tag-sotdma"],"yoast_head":"\nAIS Know-How: Data transfer (SOTDMA vs. CSTDMA) - Weatherdock English<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.easyais.com\/en\/news\/technical-news\/ais-know-how-data-transfer-sotdma-vs-cstdma\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"AIS Know-How: Data transfer (SOTDMA vs. CSTDMA) - Weatherdock English\" \/>\n<meta name=\"twitter:description\" content=\"Advantages SOTDMA to CSTDMA: + 5 watt transmission power + Transmission interval up to every 15 sec. (depending on speed) + Reservation of future slots + Sending\/receiving of text messages (addressing to MMSI possible) + 2nd priority to Class A devices\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/www.easyais.com\/en\/wp-content\/uploads\/sites\/5\/2018\/09\/Vorschaubild_CS-SO.jpg\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Weatherdock\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.easyais.com\\\/en\\\/news\\\/technical-news\\\/ais-know-how-data-transfer-sotdma-vs-cstdma\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.easyais.com\\\/en\\\/news\\\/technical-news\\\/ais-know-how-data-transfer-sotdma-vs-cstdma\\\/\"},\"author\":{\"name\":\"Weatherdock\",\"@id\":\"https:\\\/\\\/www.easyais.com\\\/en\\\/#\\\/schema\\\/person\\\/1bf9fe87acac34ee6074d7e57f82860d\"},\"headline\":\"AIS Know-How: Data transfer (SOTDMA vs. CSTDMA)\",\"datePublished\":\"2018-09-19T08:13:58+00:00\",\"dateModified\":\"2020-02-13T11:48:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.easyais.com\\\/en\\\/news\\\/technical-news\\\/ais-know-how-data-transfer-sotdma-vs-cstdma\\\/\"},\"wordCount\":1203,\"image\":{\"@id\":\"https:\\\/\\\/www.easyais.com\\\/en\\\/news\\\/technical-news\\\/ais-know-how-data-transfer-sotdma-vs-cstdma\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.easyais.com\\\/en\\\/wp-content\\\/uploads\\\/sites\\\/5\\\/2018\\\/09\\\/Vorschaubild_CS-SO.jpg\",\"keywords\":[\"AIS\",\"CSTDMA\",\"Datatelegram\",\"SOTDMA\"],\"articleSection\":[\"Technical News\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.easyais.com\\\/en\\\/news\\\/technical-news\\\/ais-know-how-data-transfer-sotdma-vs-cstdma\\\/\",\"url\":\"https:\\\/\\\/www.easyais.com\\\/en\\\/news\\\/technical-news\\\/ais-know-how-data-transfer-sotdma-vs-cstdma\\\/\",\"name\":\"AIS Know-How: Data transfer (SOTDMA vs. CSTDMA) - 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