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3m stacking cable not working on 3750's

Hello all,

I have a stack of 3750's that work great w/ the 50cm stacking cable that came with the switches. When I try to use a 1m or 3m stacking cable, the switches do not see each other. I have been through 3 cables, so I am pretty sure that it is not a cable issue per se. Are there software commands that I need to issue in order for the switches to see each other across the longer stacking cables? The software on the switches is c3750-advipservicesk9-mz.122-25.SEE2.bin

Thanks!

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