I need at least one extra pair in the CAT5 cable for power, and there are only 4 pairs available.
You can use it with 2 pairs. You check the schematics in datasheet Fig 18 and the OM6293 evaluation board User Guide for the PCA9600 which can be helpful.
I hope this can be helpful. Please let me know if you have further questions.
Have a great day,
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