44 results about "Transmission convergence" patented technology

An apparatus for transmitting data in an xDSL system is disclosed. In an exemplary embodiment, the apparatus comprises a transmitter that sends data over an xDSL system in the form of a data transmission unit (DTU), the transmitter having physical media specific—transmission convergence (PMS-TC) communication sublayer. The apparatus may further include a retransmission unit that is implemented in the PMS-TC sublayer. The retransmission unit may include a retransmission buffer that stores and indexes transmitted DTUs in retransmit containers. The retransmit container may be defined as a time slot corresponding to a sent DTU, wherein the retransmission unit is configured to respond to a retransmission request indicating which stored DTU should be retransmitted. The stored DTU to be retransmitted may be identified by its corresponding retransmit container.

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.

Provided is an apparatus for transmitting / receiving communication and broadcasting data. The transmitting apparatus includes: a mapper for mapping inputted broadcasting data into a transport stream according to a predetermined standard; a broadcasting buffer for temporarily storing the mapped transport stream for multiplexing; a communication buffer for temporarily storing a communication data stream for multiplexing; a counter for measuring data rate information of a broadcasting stream inputted between two SYNC signals and outputting the measured data rate; an SYNC signal generator for generating an SYNC signal for synchronization between the transmitting apparatus and a receiving part and periodically transmitting the generated SYNC signal; and a multiplexer for multiplexing a communication stream, a broadcasting stream, and an SYNC signal.

An implementing process of transmission convergence sublayer is used on a WiMAX base station on the basis of IP, which comprises the following two parts, the first part is the maintenance of a categorizer data structure which comprises the establishment, deletion, activation and activation release of the categorizer, the second part is that the execution of sort operations for the descending sectionalization, and the implementing key points lie in that firstly using target IP address prefix as index to establish a mapping mechanism from the target IP address of the descending sectionalizationto the relative categorizer subset, secondly searching for the relative categorizer subset through utilizing the target IP address prefix of the sectionalization, and then searching for the suitable categorizer which has the highest priority from the relative categorizer subset, thereby mapping the descending data sectionalization on the relative connection of the categorizer which is searched. The process especially conducts optimization on account of the target IP address, significantly increases the speed of the sort operation, and simultaneously, the processing algorism is simple and is easy to be realized.

The present invention provides a method and an apparatus for transmitting a physical layer operations administration and maintenance message, wherein the method comprises: splicing multiple messages with a sum of the length of message contents less than a predetermined length into a message group by a predetermined manner, and transmitting the message group in a gigabit passive optical network transmission convergence frame. By the invention, the problems of wasting the bandwidth, prolonging the time of message interaction and reducing the reliability of the message interaction in the prior art are solved, thereby effectively reducing the occupation of the bandwidth and the time of the message interaction, and improving the reliability of the message interaction.

The present invention provides a method for realizing seamless switching of encryption and decryption, including: the port identification encryption and decryption enabling switching mode negotiated and used between an optical line terminal (OLT) and an optical network unit (ONU); If the mode can be switched, the OLT sends a gigabit passive optical network transmission convergence layer GTC frame to the ONU, and the gigabit passive optical network encapsulation form GEM frame contained in the GTC frame carries a decryption enable indication, indicating that the corresponding Whether the GEM frame needs to be decrypted. The ONU decides whether to decrypt the GEM according to the decryption enabling indication. The invention also provides an OLT and an ONU.

The invention belongs to the field of petroleum drilling, in particular to an underground turbine power laser drilling tool. The underground turbine power laser drilling tool comprises a power source outer barrel, a stator blade, a rotor blade, a turbine shaft, sealing rings, a generator outer barrel, a stator, a rotor, a limit joint, a current transformer, an optical fiber laser, a combiner, an optical fiber, a drill bit body and a laser head. The stator blade and the rotor blade are connected with the turbine shaft and of an up-down two-stage structure, two O-shaped sealing rings are respectively arranged above and below the generator outer barrel, the stator and the rotor coact to produce electric energy, the current transformer is arranged at the lower part of the generator outer barrel, the optical fiber laser is arranged at the lower part of the limit joint, and laser produced by the combiner is transported to the laser head at the bottom of the drill bit body through the optical fiber. The underground turbine power laser drilling tool can provide a stable power supply for the optical fiber laser, high-energy laser transmission convergence is guaranteed, an existing drilling technology is not changed, laser and drill bit mechanical combined efficient rock breaking is realized, and petroleum drilling speed is effectively increased.

The embodiment of the invention discloses a method and a device for crossing time slots. The method comprises the following steps of: receiving a transmission convergence layer (TC) frame and extracting at least one time slot unit from payload of the TC frame, wherein each time slot unit has different units; performing crossed scheduling on the extracted time slot unit according to the preset time slot table; and outputting a crossed TC frame according to the preset generating frame header information and the crossed scheduling result, wherein a bandwidth map in the crossed TC frame at least comprises an initial position and an end position of the time slot unit, and the payload of the crossed TC frame comprises the time slot unit. The embodiment of the invention also provides an exchangedevice. In the technical scheme provided by the embodiment of the invention, the time slot units in the crossed TC frame do not need to supplement idle data to ensure that each time slot unit has thesame unit, so that the waste of bandwidth resource is reduced.