{"id":32046,"date":"2019-09-17T04:31:04","date_gmt":"2019-09-17T11:31:04","guid":{"rendered":"https:\/\/m2msupport.net\/m2msupport\/?page_id=32046"},"modified":"2019-09-17T04:41:26","modified_gmt":"2019-09-17T11:41:26","slug":"specific-absorption-rate-sar-power-backoff-in-sierra-wireless-modules","status":"publish","type":"page","link":"https:\/\/m2msupport.net\/m2msupport\/specific-absorption-rate-sar-power-backoff-in-sierra-wireless-modules\/","title":{"rendered":"Specific Absorption Rate (SAR) Power backoff in Sierra Wireless Modules"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">What is Specific Absorption Rate (SAR)?<\/h2>\n\n\n\n<p>SAR is a measure of the amount of radio frequency energy that can be absorbed by the body when using a mobile device such as a cellular phone.When cellular modules are integrated in to a host device such as PC, the SAR testing is applicable to the host device. The FCC limit for SAR level is 1.6 watts per kilogram (1.6 W\/kg).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to set SAR Power backoff in Sierra Wireless Modules?<\/h2>\n\n\n\n<p>Using the <a href=\"https:\/\/m2msupport.net\/m2msupport\/atmaxpwr-set-maximum-tx-power\/\">AT!MAXPWR<\/a> command, the <strong>SAR Power back<\/strong> values can be set for each band. Note that any change to the maximum TX power for the band should be carefully evaluated as it may impact regulatory certification.<\/p>\n\n\n\n<p>To set the <strong>SAR Power Backoff<\/strong> in Sierra Wireless modules, specify the band and the technology using the <a href=\"https:\/\/m2msupport.net\/m2msupport\/atmaxpwr-set-maximum-tx-power\/\">AT!MAXPWR<\/a> command.<\/p>\n\n\n\n<p>Examples of <strong>SAR Power Backoff<\/strong>,<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Get the Max power for LTE Band 4<ul><li>AT!MAXPWR?4,2<\/li><\/ul><\/li><li>Set the Max power for LTE Band 4 to 23 dbm<ul><li>AT!MAXPWR=4,2,23<\/li><\/ul><\/li><li>Get the Max power for WCDMA Band 3<ul><li>AT!MAXPWR?3,0<\/li><\/ul><\/li><li>Set the Max power for WCDMA Band 3 to 22 dbm<ul><li>AT!MAXPWR=3,0, 22<\/li><\/ul><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the LTE\/WCDMA bands to specify the SAR Power backoff?<\/h2>\n\n\n\n<p>Here are the 3GPP bands for which the maximum power can be set the <strong>SAR Power Backoff<\/strong> using the<a href=\"https:\/\/m2msupport.net\/m2msupport\/atmaxpwr-set-maximum-tx-power\/\"> AT!MAXPWR<\/a> command.<\/p>\n\n\n\n<table class=\"wp-block-table\"><tbody><tr><td>Band<\/td><td>Rx MHz<\/td><td>Tx MHz<\/td><\/tr><tr><td>1<\/td><td>1920\u20131980<\/td><td>2110\u20132170<\/td><\/tr><tr><td>2<\/td><td>1850\u20131910<\/td><td>1930\u20131990<\/td><\/tr><tr><td>3<\/td><td>1710\u20131785<\/td><td>1805\u20131880<\/td><\/tr><tr><td>4<\/td><td>1710\u20131755<\/td><td>2110\u20132155<\/td><\/tr><tr><td>5<\/td><td>824\u2013849<\/td><td>869\u2013894<\/td><\/tr><tr><td>6<\/td><td>830\u2013840<\/td><td>875\u2013885<\/td><\/tr><tr><td>7<\/td><td>2500\u20132570<\/td><td>2620\u20132690<\/td><\/tr><tr><td>8<\/td><td>880\u2013915<\/td><td>925\u2013960<\/td><\/tr><tr><td>9<\/td><td>1749.9\u20131784.9<\/td><td>1844.9\u20131879.9<\/td><\/tr><tr><td>10<\/td><td>1710\u20131770<\/td><td>2110\u20132170<\/td><\/tr><tr><td>11<\/td><td>1427.9\u20131447.9<\/td><td>1475.9\u20131495.9<\/td><\/tr><tr><td>12<\/td><td>699\u2013716<\/td><td>729\u2013746<\/td><\/tr><tr><td>13<\/td><td>777\u2013787<\/td><td>746\u2013756<\/td><\/tr><tr><td>14<\/td><td>788\u2013798<\/td><td>758\u2013768<\/td><\/tr><tr><td>15<\/td><td>Reserved<\/td><td>Reserved<\/td><\/tr><tr><td>16<\/td><td>Reserved<\/td><td>Reserved<\/td><\/tr><tr><td>17<\/td><td>704\u2013716<\/td><td>734\u2013746<\/td><\/tr><tr><td>18<\/td><td>815\u2013830<\/td><td>860\u2013875<\/td><\/tr><tr><td>19<\/td><td>830\u2013845<\/td><td>875\u2013890<\/td><\/tr><tr><td>20<\/td><td>832\u2013862<\/td><td>791\u2013821<\/td><\/tr><tr><td>21<\/td><td>1447.9\u20131462.9<\/td><td>1495.9\u20131510.9<\/td><\/tr><tr><td>22<\/td><td>Reserved<\/td><td>Reserved<\/td><\/tr><tr><td>23<\/td><td>2000\u20132020<\/td><td>2180\u20132200<\/td><\/tr><tr><td>24<\/td><td>1626.5\u20131660.5<\/td><td>1525\u20131559<\/td><\/tr><tr><td>25<\/td><td>1850\u20131915<\/td><td>1930\u20131995<\/td><\/tr><tr><td>26\u201332<\/td><td>Reserved<\/td><td>Reserved<\/td><\/tr><tr><td>33<\/td><td>1900\u20131920<\/td><td>1900\u20131920<\/td><\/tr><tr><td>34<\/td><td>2010\u20132025<\/td><td>2010\u20132025<\/td><\/tr><tr><td>35<\/td><td>1850\u20131910<\/td><td>1850\u20131910<\/td><\/tr><tr><td>36<\/td><td>1930\u20131990<\/td><td>1930\u20131990<\/td><\/tr><tr><td>37<\/td><td>1910\u20131930<\/td><td>1910\u20131930<\/td><\/tr><tr><td>38<\/td><td>2570\u20132620<\/td><td>2570\u20132620<\/td><\/tr><tr><td>39<\/td><td>1880\u20131920<\/td><td>1880\u20131920<\/td><\/tr><tr><td>40<\/td><td>2300\u20132400<\/td><td>2300\u20132400<\/td><\/tr><tr><td>41<\/td><td>2496\u20132690<\/td><td>2496\u20132690<\/td><\/tr><tr><td>42<\/td><td>3400\u20133600<\/td><td>3400\u20133600<\/td><\/tr><tr><td>43<\/td><td>3600\u20133800<\/td><td>3600\u20133800<\/td><\/tr><tr><td>44-60<\/td><td>Reserved<\/td><td>Reserved<\/td><\/tr><\/tbody><\/table>\n\n\n\n<h2 class=\"wp-block-heading\">What tool can be used to set SAR Power Backoff?<\/h2>\n\n\n\n<p>Any tool such as <a href=\"https:\/\/m2msupport.net\/m2msupport\/download-at-command-tester\/\">AT Command Tester<\/a> which can send AT commands to the Sierra Wireless modules can be used to set the<strong> SAR Power Backoff<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"855\" height=\"732\" src=\"https:\/\/m2msupport.net\/m2msupport\/wp-content\/uploads\/2019\/09\/at_maxpwr-1.png\" alt=\"\" class=\"wp-image-32048\" srcset=\"https:\/\/m2msupport.net\/m2msupport\/wp-content\/uploads\/2019\/09\/at_maxpwr-1.png 855w, https:\/\/m2msupport.net\/m2msupport\/wp-content\/uploads\/2019\/09\/at_maxpwr-1-300x257.png 300w, https:\/\/m2msupport.net\/m2msupport\/wp-content\/uploads\/2019\/09\/at_maxpwr-1-768x658.png 768w, https:\/\/m2msupport.net\/m2msupport\/wp-content\/uploads\/2019\/09\/at_maxpwr-1-600x514.png 600w\" sizes=\"auto, (max-width: 855px) 100vw, 855px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>What is Specific Absorption Rate (SAR)? SAR is a measure of the amount of radio frequency energy that can be absorbed by the body when using a mobile device such as a cellular phone.When cellular modules are integrated in to &hellip; <a href=\"https:\/\/m2msupport.net\/m2msupport\/specific-absorption-rate-sar-power-backoff-in-sierra-wireless-modules\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"software_howto.php","meta":{"footnotes":""},"class_list":["post-32046","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/m2msupport.net\/m2msupport\/wp-json\/wp\/v2\/pages\/32046","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/m2msupport.net\/m2msupport\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/m2msupport.net\/m2msupport\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/m2msupport.net\/m2msupport\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/m2msupport.net\/m2msupport\/wp-json\/wp\/v2\/comments?post=32046"}],"version-history":[{"count":4,"href":"https:\/\/m2msupport.net\/m2msupport\/wp-json\/wp\/v2\/pages\/32046\/revisions"}],"predecessor-version":[{"id":32054,"href":"https:\/\/m2msupport.net\/m2msupport\/wp-json\/wp\/v2\/pages\/32046\/revisions\/32054"}],"wp:attachment":[{"href":"https:\/\/m2msupport.net\/m2msupport\/wp-json\/wp\/v2\/media?parent=32046"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}