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Does M8024 with M8024-SFP+ support 2LR modules?
I have some Omnitron (OST) 70km 7361E-2LR 10G SFP+ modules that don't seem to work in M8024 (original not the -k version) have even tried crossover from M8024 in B1 to B2 and it still doesn't work. I have some 10km OST 7347E-1 that work fine in the M8024 (but not over the 23km fiber run I'm trying to use with CWDM). I have tested with 5.1.4.5 firmware and also 5.1.0.1 without success.
My theory is these 2LR SFP+ may require more power than the M8024-SFP+ can provide per port, have been trying to find any specs from Dell on power with no luck. telnet to the M8024 gives the TX bias current but that with the VDC only accounts for about 0.26 Watt and not the full power consumption of the module. I'm planning to test the modules in some other switches with 10G SFP+ uplink ports would at least like to confirm these will light up, which I haven't seen yet.
jfdnerds
10 Posts
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Posted July 21st, 2014 15:00
Alright, we tested again with an additional 10km fiber test spool and were able to establish a link. So, we're thinking the attenuation on the 23km run is less than we thought based on OTDR although that was at 1310nm and 1550nm and these SFP+ are at 1610nm (we tried to extrapolate). I guesstimate we need another ~5 dB attenuation and it should work, someone from the fiber shop may have some LC-LC 5 dB attenuators on hand. The 40km SFP+ we looked at were a bit too close with the measured loss which is why we got the 70km instead, but I guess it turned out to be too much of a good thing.