Method and device for sending upstream transfer frame in passive optical network

A device for sending an upstream transfer frame in a Passive Optical Network (PON), comprising:

• a preamble sending unit, configured to send a preamble according to an allocated time slot;
• a synchronization delimiter sending unit, configured to send a burst synchronization delimiter, wherein in the sent synchronization delimiter, the number of non-zeros is the same as the number of zeros, and in a delimiter sequence, the number of non-zeros on odd bits is equal to the number of zeros on even bits, and the number of non-zeros on even bits is equal to the number of zeros on odd bits, the number of zeros on the odd bits is N, the number of non-zeros on the odd bits is M, a relation |N−M|≦1 is satisfied, that is, a difference between N and M is not greater than 1;
• in the burst synchronization delimiter, the number of zeros in a continuous zero group is X, the number of non-zeros in a continuous non-zero group is Y, and a relation |X−Y|≦1 is satisfied;
• and
• a burst header sending unit, configured to send a burst header;
• a Gigabit-Capable Passive Optical Network (GPON) Transmission Convergence (GTC) frame header sending unit, configured to send a GTC frame header;
• and
• a GTC frame data sending unit, configured to send GTC frame data.