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Вот вырезка из даташита на RTL8201:
7.8.3 10Base Tx/Rx
1) 10Base Transmit Function: The 10Base transmit function is performed as follows: The transmit 4 bits nibbles(TXD[0:3])
clocked in 2.5MHz(TXC) is first feed to parallel to serial converter, then put the 10Mbps NRZ signal to Manchester
coding. The Manchester encoder converts the 10 Mbps NRZ data into a Manchester Encoded data stream for the TP
transmitter and adds a start of idle pulse (SOI) at the end of the packet as specified in IEEE 802.3. Then, the encoded data
stream is shaped by band- limited filter embedded in RTL8201BL and then transmitted to TP line.
2) 10Base Receive function: The 10Base receive function is performed as follows: In 10Base receive mode, The
Manchester decoder in RTL8201BL converts the Manchester encoded data stream from the TP receiver into NRZ data by
decoding the data and stripping off the SOI pulse. Then, the serial NRZ data stream is converted to parallel 4 bit nibble
signal(RXD[0:3]).