摘要:
A method and a device for information block coding and synchronization detecting are provided. Information block coding and synchronization detecting may be performed according to a synchronization character sequence satisfying certain conditions. Thus, the probability of incorrect synchronization may be effectively reduced without increasing the complexity. Optimal synchronization character sequences in different lengths are provided to further reduce the probability of incorrect synchronization.
摘要:
A method for sending uplink burst data in a passive optical network (PON) system includes: sending a synchronization pattern of the uplink burst data, the synchronization pattern being of a length, which is an integer multiple of 66 bits, and being formed by connection of 66-bit unit gene blocks; sending a burst delimiter (BD) of the uplink burst data; sending a forward error correction (FEC)-protected data in the uplink burst data; and sending an end of burst (EOB) delimiter of the uplink burst data. The technical solutions in the embodiments allow the use of a less complex equalizer at the reception end of a high-speed PON system.
摘要:
A network component comprising pre-transmit logic coupled to a transmitter that transmits packets, wherein the pre-transmit logic is configured to determine whether a scrambling sequence for a packet complies with at least a threshold line pattern criteria, and if not, delay transmission of the packet to at least partially offset the scrambling sequence used for the packet, wherein the pre-transmit logic comprises a sequence evaluator that determines whether a scrambled packet complies with at least the threshold line pattern criteria.
摘要:
The present invention relates to the Passive Optical Network (PON) technology, and a method for sending an upstream transfer frame in a PON is provided, so as to improve flexibility of a system and satisfy a requirement that an error probability is reduced as low as possible. The method includes: after success of link, sending a preamble according to an allocated time slot, sending a burst synchronization delimiter, and then sending successively a burst header, a Gigabit-Capable Passive Optical Network (GPON) Transmission Convergence (GTC) frame header, and GTC frame data. 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, the number of zeros in a continuous zero group is X, the number of non-zeros in a continuous nonzero group is Y, and a relation |X−Y|≦1 is satisfied. A device for sending an upstream transfer frame in a passive optical network is further provided.
摘要:
A method and device for indicating an uncorrectable data block. The method includes: if a forward error correction decoding fails, setting synchronization character of at least one of the corresponding data blocks to a first character; and performing line decoding on the data block with the set first character, and outputting decoded data. With the invention, indicating the uncorrectable data block Simple and effective to a line decoding module can be implemented in case of a failure of FEC decoding.
摘要:
A burst transmission method and a receiver resetting method and apparatus in a Passive Optical Network (PON) are provided. A burst receiver resetting method in a PON includes: receiving a preamble sequence and synchronizing data; after synchronizing the data, continuing to receive the data, and matching a Burst Terminator (BT); and resetting a receiver after successfully matching the BT. Meanwhile, an apparatus for implementing the method and a corresponding burst data transmission method are provided. By using the burst receiver resetting method and apparatus in the PON and the corresponding burst transmission method at an Optical Network Unit (ONU) burst transmission end, a Reach Extender (RE) does not need to unpack upstream burst bandwidth allocation information carried in downstream data.
摘要:
A method and a device for information block coding and synchronization detecting are provided. Information block coding and synchronization detecting are preformed according to a synchronization character sequence satisfying certain conditions. Thus, the probability of incorrect synchronization is effectively reduced without increasing the complexity. Optimal synchronization character sequences in different lengths are provided to further reduce the probability of incorrect synchronization.
摘要:
A method and a device for information block coding and synchronization detecting are provided. Information block coding and synchronization detecting are preformed according to a synchronization character sequence satisfying certain conditions. Thus, the probability of incorrect synchronization is effectively reduced without increasing the complexity. Optimal synchronization character sequences in different lengths are provided to further reduce the probability of incorrect synchronization.
摘要:
A method, an apparatus and a system for transmitting upstream burst data in a passive optical network system. Delimitation of end of upstream burst data is realized in the method. The method includes: transmitting a sync pattern sequence and a burst delimiter after turning on a laser; transmitting data to be sent; and transmitting an end-of-burst delimiter after the transmitting of data to be sent is finished. A method for receiving upstream burst data and a related apparatus and system are also provided in the embodiments of the invention.
摘要:
Methods and apparatus are provided for reducing Raman crosstalk in a wavelength-division-multiplexing (WDM) optical fiber transmission system that transmits a multiplex of channels. Idle data is sent over one or more of the channels of the WDM system in order to maintain the optical link when user data is not being sent. The idle data has an idle data pattern, which can be controlled such that a power spectral density of a signal carried by at least one channel is shifted in order to reduce Raman crosstalk between the channels. For example, the power spectral density may be shifted away from lower frequencies of the channel, and toward the higher frequencies, by controlling the idle data pattern. Alternatively, the power spectral density may be shifted towards unused frequencies of the channel, by controlling the idle data pattern.