The necessity of a 6-layer PCB in high-speed USB design stems from three critical requirements: signal integrity, electromagnetic compatibility (EMC), and power distribution network (PDN) efficiency. The additional layers provide dedicated ground and power planes, which are essential for minimizing noise and ensuring consistent voltage levels, thus preserving the integrity of high-speed signals. Moreover, these layers act as a shield against electromagnetic interference, crucial for compliance with stringent EMC standards in high-speed data transmission.

Utilizing a direct gender adapter connection, rather than traditional cabling, significantly reduces common-mode noise in high-speed USB designs. This architecture minimizes the loop area between signal pairs, effectively attenuating electromagnetic interference (EMI) pathways and bolstering signal integrity. Consequently, it ensures superior performance by mitigating noise susceptibility, crucial for maintaining the fidelity of high-speed data transfers.

The USB Type-C connector is inherently advantageous in mitigating noise in USB data transmission due to its compact, symmetrical design, which facilitates a more uniform and shorter signal path. This design minimizes the loop area and reduces the inductance and susceptibility to common-mode noise, enhancing signal integrity. Additionally, the connector's enhanced shielding specification provides superior protection against electromagnetic interference, ensuring a stable and clear signal transmission essential for high-speed USB communication.