Framing method and apparatus in passive optical network and system

A deframing method in a passive optical network (PON), comprising:

• receiving, by an optical network unit (ONU), a frame comprising a first sub-frame and a second sub-frame from an optical line terminal (OLT), wherein a downstream rate of the first sub-frame is different from a downstream rate of the second sub-frame;
• obtaining, by the ONU, the second sub-frame;
• performing, by the ONU, bit mapping restoration on the second sub-frame to generate a third sub-frame, wherein the bit mapping restoration refers to restoration of every N bits in the second sub-frame to one bit, wherein N is an integer greater than 1;
• and
• parsing, by the ONU, the second sub-frame.

A framing apparatus, comprising:

• a memory comprising instructions;
• and
• a processor coupled to the memory, wherein the instructions cause the processor to be configured to:
• separately generate a first sub-frame and a second sub-frame, wherein a downstream rate of the first sub-frame is different from a downstream rate of the second sub-frame;
• perform bit mapping on the second sub-frame to generate a third sub-frame, wherein the bit mapping refers to identifying each bit of the second sub-frame using N bits, wherein N is an integer greater than 1, and wherein the downstream rate of the second sub-frame is the same as a downstream rate of the third sub-frame;
• and
• send a frame to an optical network unit (ONU), wherein the frame comprises the first sub-frame and the third sub-frame.

A deframing apparatus, comprising:

• a memory comprising instructions;
• and
• a processor coupled to the memory, wherein the instructions cause the processor to be configured to:
• receive a frame comprising a first sub-frame and a second sub-frame, wherein a downstream rate of the first sub-frame is different from a downstream rate of the second sub-frame;
• obtain the second sub-frame;
• perform bit mapping restoration on the second sub-frame to generate a third sub-frame, wherein the bit mapping restoration refers to restoration of every N bits in the second sub-frame to one bit, wherein N is an integer greater than 1;
• and
• parse the third sub-frame.