{"id":361,"date":"2010-03-24T19:54:52","date_gmt":"2010-03-24T19:54:52","guid":{"rendered":"http:\/\/ravtrack.com\/GPStracking\/?p=361"},"modified":"2011-02-04T18:26:25","modified_gmt":"2011-02-04T18:26:25","slug":"tdma-transmission-overview","status":"publish","type":"post","link":"https:\/\/ravtrack.com\/GPStracking\/tdma-transmission-overview\/","title":{"rendered":"TDMA Transmission Overview"},"content":{"rendered":"<p>TDMA, or <em>Time-Division-Multiple-Access<\/em> is a very effective way of allowing a lot of radios to share one radio channel.\u00a0 Used extensively in GSM cellular and APCO public-safety systems, TDMA excels at allowing quick and reliable access to radio channels.\u00a0 It allows 2-10 times more radios to share a radio channel than conventional carrier-sense methods.\u00a0 This allows 2-10 times more tracking radios on one channel, as compared to radios that do not have TDMA capability.<\/p>\n<p>The following diagram illustrates how it works.<\/p>\n<p><a title=\"TDMA frame structure showing a data stream divided into frames and those frames divided into timeslots.\" href=\"http:\/\/en.wikipedia.org\/wiki\/Image:Tdma-frame-structure.png\"><\/a><a href=\"http:\/\/ravtrack.com\/GPStracking\/wp-content\/uploads\/2010\/03\/tdmaslots1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-363\" title=\"tdmaslots\" src=\"http:\/\/ravtrack.com\/GPStracking\/wp-content\/uploads\/2010\/03\/tdmaslots1.jpg\" alt=\"\" width=\"354\" height=\"132\" srcset=\"https:\/\/ravtrack.com\/GPStracking\/wp-content\/uploads\/2010\/03\/tdmaslots1.jpg 354w, https:\/\/ravtrack.com\/GPStracking\/wp-content\/uploads\/2010\/03\/tdmaslots1-300x111.jpg 300w\" sizes=\"(max-width: 354px) 100vw, 354px\" \/><\/a><\/p>\n<p>When a <em>RV-M7 GX<\/em> wants to report its position and status, it waits until its assigned time-slot, and then transmits its data.\u00a0 By default, TDMA time slot positions are assigned by unit-ID, so <em>RV-M7 GX<\/em> with ID 1 uses the first slot, and ID 2 uses the second slot, and so on.\u00a0 This default slot assignment can be overriden by the <strong>SLOTNUM<\/strong> command or by using Raveon&#8217;s Radio Manager software, allowing\u00a0each GX to have an ID that is different than the slot assignment.<\/p>\n<p>A TDMA \u201c<em>Frame<\/em>\u201d time is the time it takes all units to transmit once.\u00a0 This is configured with the <strong>TDMATIME xx <\/strong>command.\u00a0 The factory default is 10 seconds, so every 10 seconds, each <em>RV-M7 GX <\/em>may transmit. \u00a0The TDMA frame must be set long enough for all units to transmit. \u00a0For example, if you have 50 <em>RV-M7<\/em>s, and use 200mS TDMA slots, then the <strong>TDMATIME<\/strong> should be set to 10 seconds.\u00a0 The simplest way to set it the <strong>TDMATIME<\/strong> is to make it equal to the <strong>TXRATE<\/strong>, the rate you wish to report position<\/p>\n<p>The duration of a TDMA time slot is programmed into the <em>RV-M7 GX<\/em> with the <strong>SLOTTIME<\/strong> command. If <strong>SLOTTIME<\/strong> is set to 200 milliseconds (factory default), then every 10 seconds, the RV-M7 will have a 200mS window to report its position in.<\/p>\n<p>All TDMA frames are synchronized automatically in all <em>RV-M7 GX Transponders<\/em> to the top of the minute. \u00a0Slot 0, frame 0 is at the top of each minute. They use the internal GPS receiver to determine the current time, and calculate when their are supposed to transmit their position and status information.<\/p>\n<p>A unit may be allocated additional time slots.\u00a0 The SLOTQTY command sets the number of slots each unit receives.\u00a0 It is normally set to 1.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>TDMA, or Time-Division-Multiple-Access is a very effective way of allowing a lot of radios to share one radio channel.\u00a0 Used extensively in GSM cellular and APCO public-safety systems, TDMA excels at allowing quick and reliable access to radio channels.\u00a0 It&hellip;<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>TDMA Transmission Overview - 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