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I believe Leo is correct, i.e. longest cable is 3m.
If the 7m is between individual units, you're out of luck connecting them as a stack. If the 7m is between "top" and "bottom" unit, what might work for you is connecting 1 to 2 and 3, and 4 to 2 and 3. You could also just connect 1<>2<>3<>4, they will work as a stack, but then you lose stack redundancy and half your stack's bandwidth. Lastly, you might stack 1 and 2 and 3 and 4 and interconnect the two stacks using normal port cables, perhaps with Etherchannel, if you have "extra" ports.
