LX SFP not working in shared port

[Chris_Youngblut]

Just purchased a new X440 - G2 switch and Extreme 1GB LX SFPs. I am not able to get the SFPs to work in the shared ports (using port 47/48). Is there something I need to do activate those ports to work with the SFPs? I've tried different Single Mode patch cables as well as different ports/switches on the other end. I know those have worked in the past. Ideas? ALso, can I plug these SFPs into the 10GB ports on the back of the switch?

[BrandonC]

It looks like the RX power on that port is -infinity dBm, so nothing is being received. Have you tried swapping the fiber pairs on one end of the link? I suspect both optics may be transmitting onto the same fiber strand.

[Chris_Youngblut]

I get the following when I show port transceiver info:

47 31.59 -4.89 -inf* 8.30 3.29 N/A

I ran the second command and still nothing.

[Jeremy_Gibbs]

Hmm.. What if you do a show port transceiver information detail, what do you get for 47/48?

This command might work
configure ports 47 preferred-medium fiber force