https://community.extremenetworks.com/t5/extremeswitching-exos-switch/some-troubles-with-sfp-dac-cable-on-summit-stack/m-p/82429#M20227 <P>Hello. Could&nbsp;you please help to resolve the trouble&nbsp;with DAC cables on my summit stack.</P> <P>Extreme x650 with 12.5 EXOS in stack mode works normal with DAC SFP+ Tyco&nbsp;Electronics (sfp stickered “Extreme networks 10307”&nbsp;number), but show&nbsp; “Media SF+_UNKNOWN is inserted into Port 7 “ in log buffer.</P> <P>After I’ve tried to update EXOS&nbsp;to 15.3 all ports turned ON&nbsp;except this DAC cables (4 PCS). They were&nbsp;in a Ready state. I had to roll back the update. Could you recommend the proper DAC cable or what is the trouble?</P> <P>Thank you.</P> Mon, 15 Jun 2020 14:35:06 GMT Alexander89 2020-06-15T14:35:06Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/some-troubles-with-sfp-dac-cable-on-summit-stack/m-p/82429#M20227 <P>Hello. Could&nbsp;you please help to resolve the trouble&nbsp;with DAC cables on my summit stack.</P> <P>Extreme x650 with 12.5 EXOS in stack mode works normal with DAC SFP+ Tyco&nbsp;Electronics (sfp stickered “Extreme networks 10307”&nbsp;number), but show&nbsp; “Media SF+_UNKNOWN is inserted into Port 7 “ in log buffer.</P> <P>After I’ve tried to update EXOS&nbsp;to 15.3 all ports turned ON&nbsp;except this DAC cables (4 PCS). They were&nbsp;in a Ready state. I had to roll back the update. Could you recommend the proper DAC cable or what is the trouble?</P> <P>Thank you.</P> Mon, 15 Jun 2020 14:35:06 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/some-troubles-with-sfp-dac-cable-on-summit-stack/m-p/82429#M20227 Alexander89 2020-06-15T14:35:06Z