Patent ID: 8331379

Claim:
A method for sending an upstream transfer frame in a Passive Optical Network (PON), comprising: sending a preamble according to an allocated time slot; sending a burst synchronization delimiter, where 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, 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 sending a burst header, a Gigabit-Capable Passive Optical Network (GPON) Transmission Convergence (GTC) frame header, and GTC frame data.