https://devzone.nordicsemi.com/f/nordic-q-a/70595/connection-problem-with-cmw500-with-nrf9160dk-with-nb-iot-systemHi, I would use the test nRF9160DK and Thing91DK with CMW500 equipment under NB-IOT stanadard. Both DK kit and Thing91DK can connected to service provider when I plug-in service provider SIM card and cloud service seem to be normal When I changeen-USTelligent Community 13Tue, 19 Jan 2021 02:41:56 GMThttps://devzone.nordicsemi.com/thread/289903?ContentTypeID=1Tue, 19 Jan 2021 02:41:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6ddbb4f5-9a68-439f-9e0e-60dc722e81faHungli3333<p>Oyvind,</p> <p>I have read this guide already but I can see on left bottom corner of &quot;default bearer&quot; have no RLC mode to be displayed from the following screen.&nbsp; Does it means that an option KS510 to be needed?&nbsp; In fact, my CMW500 have not purchased this option, do you have any suggestion to test NB-IOT without this option?</p> <p>&nbsp;<img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/print4.jpeg" alt=" " /></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/289735?ContentTypeID=1Mon, 18 Jan 2021 13:07:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d9090d74-7449-4219-884f-ebcb4c3bbd4e&#216;yvind<p>Hello,&nbsp;<br /><br /></p> <p>Have you seen this guide on &quot;<a href="https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/hardware-design/posts/using-nrf9160-against-r-s-cmw500-or-cmw290-in-signalling-callbox-mode">Using nRF9160 against R&amp;S CMW500 (or CMW290) in signalling callbox mode</a>&quot;?&nbsp;</p> <p>This should give you the correct configuration on CMW500.&nbsp;<br /><br />Kind regards,<br />Øyvind</p><div style="clear:both;"></div>