Cisco SFP not connecting, shows signal, but with a fault

[Steve_Ballantyn]

Hello,

I have an Extreme X450-G2-48P-GE4 which I am linking to a Cisco 3750 series switch using two Cisco SFP 1000base SX modules (GLC-SX-MM). I am running ExtremeXOS version 16.1.2.14. I have no link lights, and no errors in my logs.

When I pull a debug on the port it shows signal is present, but that there is a "TX fault". I have tried increasing the debounce to 150 and then to 900, and rebooted the switch several times --- but still no connection.

Does anyone have any ideas on what I can try? I have two Extreme brand SFP's on the way, but I am trying to get this connection up in a hurry as users are anxious to get into new office space.
* X450G2-48p-G4.14 # debug hal show optic port 49
Port 49
SFP or SFP+: SFP
Signal: present
TX Fault: yes
SFP/SFP+ Vendor: CISCO-AVAGO
SFP/SFP+ Part Number: QFBR-5766LP
SFP/SFP+ Serial Number: AGS104255PX
SFP/SFP+ Manufacture Date: 061018
SFP/SFP+ Type: SFP/SFP+
Connector: LC
GE Compliance: 1000BASE-SX
Wavelength: 850
Also, I am *assuming* that the physical cable is good. But I had better be sure that it's not before I have the company come out to run a new line.

[Joseph_Burnswor]

Are these being linked directly or through a Fiber Interconnect panel? If through a Panel Interconnect, I would check to make sure that the lasers are not aligning with each other. I would verify that the lasers are lighting the receive side (No light side) of each SFP and not laser to laser

[Steve_Ballantyn]

Yes, they are MMF SFP's. The cable is orange. The full description of the cable is "Tripp Lite 25M Duplex Multimode Fiber 62.5/125 Patch Cable LC/LC 82ft".

[Joseph_Burnswor]

These are MMF SFP's correct? what color fiber are you using to connect them? Orange or yellow?

[Steve_Ballantyn]

There is no panel in this connection. It's just one long fiber cable with LC ends. There appears to be light on both sides. I have also tried flipping one end (TX/RX), but it didn't have any effect.

[JeremyClarkson]

Interesting to find out if other SFP modules work with Extreme Devices.