согласующие 100R резисторы между (tx+ и tx-), (rx+ и rx-) как можно ближе к кристаллу.
Signal Terminations A single 100 W (1%) resistor is used to terminate the transmit differential (TDP/TDN) pair. For the receive differential (RDP/RDN) pairs, a 120 W (1%) resistor was utilized. The 120 W resistor was used in the layout of this design because of the improvements in receive performance, the designer may want to experiment with values from 100 W to 120 W on the receive side. They should be placed as close to the 82559 as possible.