https://community.extremenetworks.com/t5/extremeswitching-vsp-fabric/7520-switch-running-vsp-fails-to-connect-to-bt-nte/m-p/122750#M3300 <P>We have been running a migration successfully until we hit a snag recently.</P><P>I have a 7520 switch running VOSS 9.4.1 with a 1gig SX SFP installed.&nbsp; We move a working BT NTE connection at 1gig from the Cisco to the Extreme (same SFP type and same cable) and the Extreme switch brings the interface up/up, however the NTE is orange indicating an error on its side.</P><P>We have tried the obvious, change polarity on cable, using nonegotiate etc, but to no effect.</P><P>&nbsp;</P><P>The show pluggable-opticalmodules detail&nbsp; indicates a good RX/TX signal level and doesn't show any thing out of the ordinary.</P><P>Has anybody else faced a similar issue?&nbsp; And if so, what was the fix?</P> Mon, 05 Oct 2026 12:56:02 GMT ShaunM 2026-10-05T12:56:02Z https://community.extremenetworks.com/t5/extremeswitching-vsp-fabric/7520-switch-running-vsp-fails-to-connect-to-bt-nte/m-p/122750#M3300 <P>We have been running a migration successfully until we hit a snag recently.</P><P>I have a 7520 switch running VOSS 9.4.1 with a 1gig SX SFP installed.&nbsp; We move a working BT NTE connection at 1gig from the Cisco to the Extreme (same SFP type and same cable) and the Extreme switch brings the interface up/up, however the NTE is orange indicating an error on its side.</P><P>We have tried the obvious, change polarity on cable, using nonegotiate etc, but to no effect.</P><P>&nbsp;</P><P>The show pluggable-opticalmodules detail&nbsp; indicates a good RX/TX signal level and doesn't show any thing out of the ordinary.</P><P>Has anybody else faced a similar issue?&nbsp; And if so, what was the fix?</P> Mon, 05 Oct 2026 12:56:02 GMT https://community.extremenetworks.com/t5/extremeswitching-vsp-fabric/7520-switch-running-vsp-fails-to-connect-to-bt-nte/m-p/122750#M3300 ShaunM 2026-10-05T12:56:02Z