Method and apparatus for sending and receiving clock synchronization packet
This disclosure provides a method for sending and receiving a clock synchronization packet in FlexE. The method includes: generating, by a sending apparatus, indication information and a plurality of data blocks, where the plurality of data blocks are obtained by encoding a first clock synchronization packet, the indication information is used to indicate a first data block, and the first data block is a data block used for timestamp sampling in the plurality of data blocks; determining, by the sending apparatus, according to the indication information, a moment at which the first data block arrives at a medium dependent interface MDI of the sending apparatus, and generating a sending timestamp, where the sending timestamp is used to record a sending moment of the first clock synchronization packet; generating a second clock synchronization packet carrying the sending timestamp; and sending, by the sending apparatus, the second clock synchronization packet.
1. A method for sending a clock synchronization packet in flexible Ethernet (FlexE), comprising:
encoding a clock synchronization packet;
generating a plurality of data blocks including a first data block for data sampling based on the encoded clock synchronization packet; and
transmitting the plurality of data blocks in a client payload of FlexE.
2. The method according to claim 1 , including generating and transmitting indication information to trigger sampling of the first data block during a receive period of the data block.
3. The method according to claim 2 , wherein the indication information comprises one of out-of-band information or in-band information.
4. The method according to claim 2 , wherein the indication information indicates a data block associated with a start-of-frame delimiter, SFD.
5. The method according to claim 4 , wherein the indication information indicates a data block corresponding to the SFD, or, the indication information indicates a data block corresponding to a first symbol after the SFD.
6. The method according to claim 4 , wherein the first data block is a data block associated with the SFD.
7. The method according to claim 6 , wherein the first data block is a data block comprising the SFD, or the first data block is a data block comprising the first symbol after the SFD.
8. The method according to claim 1 , wherein before the transmitting, by the sending apparatus, the plurality of data blocks carried in the client payload of FlexE, the method further comprises:
determining the first data block according to the indication information; and
obtaining a sending timestamp of the first data block, wherein the sending timestamp is carried in the plurality of data blocks.
9. A method for receiving a clock synchronization packet in flexible Ethernet (FlexE), comprising:
receiving, by a receiving apparatus, a client payload of FlexE that includes a plurality of data blocks that form an encoded clock synchronization packet;
identifying and sampling a first data block in the plurality of data blocks during a receive period of the data block to determine a timestamp.
10. The method according to claim 9 , further including receiving indication information to trigger sampling of the first data block.
11. The method according to claim 10 , wherein the first data block is a data block corresponding to the indication information or the first data block is a data block corresponding to a first symbol after the indication information.
12. The method according to claim 10 wherein the indication information is a start-of-frame delimiter, SFD.
13. The method according to claim 12 , wherein the first data block is a data block associated with the SFD.
14. The method according to claim 13 , wherein the first data block is a data block comprising a start-of-frame delimiter SFD or the first data block is a data block comprising the first symbol after the SFD.
15. The method according to claim 9 , wherein a quantity of the plurality of receipt timestamps is less than a quantity of the plurality of data blocks, and
before the determining, by the receiving apparatus, a first receipt timestamp corresponding to a first data block, the method further comprises:
recording, by the receiving apparatus, a quantity of bits separated between each of the plurality of data blocks and a reference data block, wherein the reference data block is a data block whose receiving moment is recorded in the plurality of data blocks; and
determining, by the receiving apparatus, the first receipt timestamp of the first data block based on a correspondence between a time and a quantity of bits, a quantity of bits separated between the first data block and the reference data block, and a receipt timestamp of the reference data block.
16. An apparatus for sending a clock synchronization packet in flexible Ethernet, FlexE, comprising:
a processor, configured to execute computer instructions to cause the apparatus to perform the steps of:
encoding a clock synchronization packet;
generating a plurality of data blocks including a first data block for data sampling based on the encoded clock synchronization packet; and
transmitting the plurality of data blocks in a client payload of FlexE.
17. The apparatus according to claim 16 , including generating and transmitting indication information.
18. The apparatus according to claim 17 , wherein the indication information is out-of-band information or in-band information.
19. The apparatus according to claim 17 , wherein the indication information is used to indicate a data block associated with a start-of-frame delimiter, SFD.
20. The apparatus according to claim 19 , wherein the indication information is used to indicate a data block corresponding to the SFD, or, the indication information is used to indicate a data block corresponding to a first symbol after the SFD.
21. The apparatus according to claim 19 , wherein the first data block is a data block associated with the SFD.
22. The apparatus according to claim 21 , wherein the first data block is a data block comprising the SFD, or the first data block is a data block comprising the first symbol after the SFD.
23. A receiving apparatus for receiving a clock synchronization packet in flexible Ethernet, FlexE, comprising:
a processor, configured to execute computer instructions to cause the apparatus to perform the steps of:
receiving, by the receiving apparatus, a client payload of FlexE that includes a plurality of data blocks that form an encoded clock synchronization packet; and
identifying and sampling a first data block in the plurality of data blocks during a receive period of the data block t to determine a timestamp.
24. The receiving apparatus according to claim 23 , further including receiving indication information to trigger sampling of the first data block.
25. The receiving apparatus according to claim 24 , wherein the first data block is a data block corresponding to the indication information or the first data block is a data block corresponding to a first symbol after the indication information.
26. The receiving apparatus according to claim 24 , wherein the indication information is a start-of-frame delimiter, SFD.
27. The receiving apparatus according to claim 26 , wherein the first data block is a data block associated with the SFD.
28. The receiving apparatus according to claim 27 , wherein the first data block is a data block comprising the SFD or the first data block is a data block comprising the first symbol after the SFD.
29. The receiving apparatus according to claim 23 , wherein a quantity of the plurality of receipt timestamps is less than a quantity of the plurality of data blocks, and the processor is configured to cause the apparatus to:
record a quantity of bits separated between each of the plurality of data blocks and a reference data block, wherein the reference data block is a data block whose receiving moment is recorded in the plurality of data blocks; and
determine the receipt timestamp of the first data block based on a correspondence between a time and a quantity of bits, a quantity of bits separated between the first data block and the reference data block, and a receipt timestamp of the reference data block.