https://devzone.nordicsemi.com/f/nordic-q-a/34420/defined-by-each-higher-layer-specificationhi While Reading Bluetooth Specification I often come across this phrase &quot; defined by each higher layer specification . &quot; What does it mean ??en-USTelligent Community 13Wed, 16 May 2018 11:56:19 GMThttps://devzone.nordicsemi.com/thread/132264?ContentTypeID=1Wed, 16 May 2018 11:56:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6ab2e295-b1b6-405e-a925-3991fb691ab3H&#229;kon Alseth<p>Most protocols have different layers of access. This is also the same for the bluetooth core spec.</p> <p>It&#39;s similar to the OSI model:</p> <p><a href="https://en.wikipedia.org/wiki/OSI_model">https://en.wikipedia.org/wiki/OSI_model</a></p> <p>&nbsp;</p> <p>Best regards</p> <p>Håkon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/132226?ContentTypeID=1Wed, 16 May 2018 10:10:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:47ed42d5-8065-4eae-b578-a61b9a0ee848priya123<p><a href="https://devzone.nordicsemi.com/members/bjorn-kvaale">Bjørn Kvaale</a> Kind attention !!!!!!!!!!!!</p><div style="clear:both;"></div>