Data transmission method, apparatus, and system

A data transmission method, comprising:

• receiving, by a receive end device, an optical data frame sent by an optical switching device, wherein the optical data frame belongs to an optical data packet acquired by the optical switching device from a transmit end device, the optical data packet is generated by the transmit end device according to second data, the second data is generated after the transmit end device performs first scrambling processing on first data by using a scrambler, the first data is data to be sent by a first Ethernet device to a second Ethernet device, the optical data frame comprises a field of a first preamble, a data start field, a data field, and a data end field, the field of the first preamble is used to carry the first preamble, a length of the first preamble is greater than or equal to a first preset value, the data field is used to carry the second data, the data start field is used to carry a data start character, the data start character is used to identify a start of the second data, the data end field is used to carry a data end character, and the data end character is used to identify an end of the second data;
• after restoration and adjustment are performed on a burst signal according to the first preamble, acquiring the second data according to the data start character and the data end character;
• and
• performing first descrambling processing on the second data by using a descrambler, so as to acquire the first data, wherein the scrambler is in a preset first initial state before starting the first scrambling processing and after completing the first scrambling processing, the descrambler is in a preset second initial state before starting the first descrambling processing and after completing the first descrambling processing, and the second initial state is corresponding to the first initial state.

A data transmission apparatus, comprising:

• an acquiring unit, configured to acquire first data, wherein the first data is data to be sent by a first Ethernet device to a second Ethernet device, and the first data comprises a Media Access Control (MAC) layer data frame or an Internet Protocol (IP) data packet;
• a scrambling unit, configured to perform first scrambling processing on the first data by using a scrambler, so as to generate second data;
• a generating unit, configured to generate, according to the second data, an optical data packet that comprises an optical data frame, wherein the optical data frame comprises a field of a first preamble, a data start field, a data field, and a data end field, the field of the first preamble is used to carry the first preamble, a length of the first preamble is greater than or equal to a first preset value, the data field is used to carry the second data, the data start field is used to carry a data start character, the data start character is used to identify a start of the second data, the data end field is used to carry a data end character, and the data end character is used to identify an end of the second data;
• and
• a sending unit, configured to send an optical signal that carries the optical data packet to an optical switching device, so that the optical switching device performs switching processing on the optical signal, so as to send the optical data frame to the second Ethernet device.

A data transmission apparatus, comprising:

• a receiving unit, configured to receive an optical data frame sent by an optical switching device, wherein the optical data frame belongs to an optical data packet acquired by the optical switching device from a transmit end device, the optical data packet is generated by the transmit end device according to second data, the second data is generated after the transmit end device performs first scrambling processing on first data by using a scrambler, the first data is data to be sent by a first Ethernet device to a second Ethernet device, the optical data frame comprises a field of a first preamble, a data start field, a data field, and a data end field, the field of the first preamble is used to carry the first preamble, a length of the first preamble is greater than or equal to a first preset value, the data field is used to carry the second data, the data start field is used to carry a data start character, the data start character is used to identify a start of the second data, the data end field is used to carry a data end character, and the data end character is used to identify an end of the second data;
• an acquiring unit, configured to:
• after restoration and adjustment are performed on a burst signal according to the first preamble, acquire the second data according to the data start character and the data end character;
• and
• a descrambling unit, configured to perform first descrambling processing on the second data by using a descrambler, so as to acquire the first data, wherein the scrambler is in a preset first initial state before starting the first scrambling processing and after completing the first scrambling processing, the descrambler is in a preset second initial state before starting the first descrambling processing and after completing the first descrambling processing, and the second initial state is corresponding to the first initial state.