Wired communications device and method for operating a wired communications device

1. A method for operating a wired communications device, the method comprising:

generating a random data sequence based on a thermal noise within the wired communications device;

including a frame boundary bit sequence and the random data sequence as a preamble of a bit stream, wherein the preamble including the random data sequence is not scrambled;

encoding the bit stream into an encoded bit stream; and

transmitting the encoded bit stream using the wired communications device.

2. The method of claim 1 , wherein the frame boundary bit sequence comprises a start of stream delimiter (SSD).

3. The method of claim 1 , wherein the frame boundary bit sequence is encoded differently from a remaining portion of the preamble of the bit stream.

4. The method of claim 1 , further comprising generating the random data sequence using a linear feedback shift register (LFSR).

5. The method of claim 1 , wherein including the frame boundary bit sequence and the random data sequence as the preamble of the bit stream comprises selecting one of the frame boundary bit sequence, the random data sequence, and the bit stream as an output of a multiplexer.

6. The method of claim 1 , wherein encoding the bit stream into the encoded bit stream comprises encoding the bit stream into the encoded bit stream using differential Manchester encoding.

7. The method of claim 1 , wherein the bit stream is an Ethernet packet.

8. The method of claim 7 , wherein the wired communications device is an Ethernet communications device.

9. The method of claim 1 , wherein transmitting the encoded bit stream using the wired communications device comprises transmitting the encoded bit stream in differential signals using the wired communications device.

10. A wired communications device, the wired communications device comprising:

a random data generator configured to generate a random data sequence based on a thermal noise within the wired communications device;

a bit manipulating unit configured to include a frame boundary bit sequence and the random data sequence as a preamble of a bit stream, wherein the preamble including the random data sequence is not scrambled;

an encoder configured to encode the bit stream into an encoded bit stream; and

a transmitter unit configured to transmit the encoded bit stream using the wired communications device.

11. The wired communications device of claim 10 , wherein the frame boundary bit sequence comprises a start of stream delimiter (SSD).

12. The wired communications device of claim 10 , wherein the frame boundary bit sequence is encoded differently from a remaining portion of the preamble of the bit stream.

13. The wired communications device of claim 10 , wherein the random data generator is configured to generate the random data sequence using a linear feedback shift register (LFSR).

14. The wired communications device of claim 10 , wherein the bit manipulating unit comprises a multiplexer configured to select one of the frame boundary bit sequence, the random data sequence, and the bit stream as an output of a multiplexer.

15. The wired communications device of claim 10 , wherein the encoder is further configured to encode the bit stream into the encoded bit stream using differential Manchester encoding.

16. The wired communications device of claim 10 , wherein the wired communications device is an Ethernet communications device.

17. The wired communications device of claim 10 , wherein the transmitter unit is further configured to transmit the encoded bit stream in differential signals using the wired communications device.

18. A method for operating an Ethernet device, the method comprising:

generating a random data sequence based on a thermal noise within the wired communications device;

including a start of stream delimiter (SSD) and the random data sequence as a preamble of an Ethernet packet, wherein the preamble including the random data sequence is not scrambled;

encoding the Ethernet packet into an encoded Ethernet packet; and

transmitting the encoded Ethernet packet in differential signals using the Ethernet device.