Za gigabitni ethernet se koriste sve 4 parice.
Citat:
Since negotiation takes place on only two pairs, if two gigabit devices are connected through a cable with only two pairs, the devices will successfully choose 'gigabit' as the highest common denominator (HCD), but the link will never come up. Most gigabit physical devices have a specific register to diagnose this behavior. Some drivers offer an "Ethernet@Wirespeed" option where this situation leads to a slower yet functional connection.[7]
The data is transmitted over four copper pairs, eight bits at a time. First, eight bits of data are expanded into four three-bit symbols through a non-trivial scrambling procedure based on a linear feedback shift register; this is similar to what is done in 100BASE-T2, but uses different parameters. The three-bit symbols are then mapped to voltage levels which vary continuously during transmission.
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https://en.m.wikipedia.org/wiki/Gigabit_Ethernet