摘要:
An apparatus and method for managing traffic using a VID in EPON are provided. The apparatus includes a MAC lookup table, a service classification policy table, a service control policy table, a MAC lookup unit, a first and second classification module, a VID learning unit and a first and second service control module. The apparatus classifies all packets of up/downlink transmission flow using a VID into a VID unit, through the first and second classification modules and manages traffic thereof according to the parameters thereof through the first and second service control modules. Accordingly, a large amount of traffic for numerous subscribers and services thereof, which was cannot be processed by the limitation on embodying a typical switch or router, can be processed according to the present invention.
摘要:
A method for managing a service bandwidth by a customer port and an EPON system using the same are provided. In order to manage the service bandwidth by a customer, ONU and ONT allocate a service class according to a combination of information about a customer that receives a service, and a service type and a service priority of a service provided to a customer, allocate a bandwidth according to each service class and control a uplink bandwidth or a downlink bandwidth according to a service class. Also, a system manger collects information about a service provider, a service provided from a service provider, a customer that receives a service, and information for classifying a service. After collecting, the system manager provides the collected information to the ONU and the OLT.
摘要:
A method for managing a service bandwidth by a customer port and an EPON system using the same are provided. In order to manage the service bandwidth by a customer, ONU and ONT allocate a service class according to a combination of information about a customer that receives a service, and a service type and a service priority of a service provided to a customer, allocate a bandwidth according to each service class and control a uplink bandwidth or a downlink bandwidth according to a service class. Also, a system manger collects information about a service provider, a service provided from a service provider, a customer that receives a service, and information for classifying a service. After collecting, the system manager provides the collected information to the ONU and the OLT.
摘要:
A wideband multi-tone transceiver system interoperable with Asymmetric Digital Subscriber Line (ADSL) transceiver system, and including a two-step transceiver system having a discrete multi-tone transceiver system and a cosine modulated filter bank (CMFB) transmultiplexer. The two-step transceiver system provides a physically transparent transmission channel to each sub-band signal by minimizing the interference between sub-bands regardless of the transmission channel characteristics. The two-step transceiver system is realized with a comparably simple structure, and the circuit size is drastically reduced by sharing the FFT function with other sub-channels with the maximal utilization of the high-speed circuit when realizing each sub-channel's DMT modulation and demodulation function.
摘要:
Method for designing TEQs(Time-domain Equalizers) for different signal bands in a VDSL transmission system, including the steps of dividing an entire signal band into at least two signal bands, and respectively modulating the divided signal bands before transmission at a transmitter, and applying respective transmitted signal bands to an algorithm that can reduce channel response lengths of the respective signal bands at a receiver, for obtaining respective TEQs, and connecting the TEQs in series, wherein an entire signal band is divided into a low frequency signal band and a high frequency signal band, with the low frequency signal band allocated smaller than the high frequency signal band, and preferably the low frequency signal band includes the signal band used in an ADSL, whereby reducing an amount of hardware and assuring an interchangeability with the ADSL transmission system.
摘要:
An apparatus for transmitting a FEC frame is provided. In order to correct an error caused by a transmission medium using FEC in a Reed-Solomon code type, FEC encoding/decoding of a frame is performed. A total transmission delay time is not influenced when FEC is bypassed, a delay caused by a shortened codeword is minimized, and a FEC encoding/decoding delays for frames having different lengths are equalized.
摘要:
A method of controlling a Forward Error Correction (FEC) operation including: configuring a FEC frame to be transmitted between an OLT and an ONU comprising a FEC frame identifier indicating whether FEC should be performed, data, a first flag indicating that FEC should be performed, and a second flag indicating that the FEC frame is to be FEC encoded; initializing the OLT by disabling a FEC function; determining whether the ONU requires FEC to be performed based on a FEC frame identifier received from the ONU; IPG stretching the FEC frame when the ONU requires to FEC to be performed; and transmitting the FEC frame to the ONU after FEC encoding based on the second flag of an input frame to a PCS sublayer from an upper layer. The method controls an effective operation of a FEC of an ONU and an OLT without changing a Round Trip Time (RTT) according to optical link quality in an EPON. Accordingly, FEC is used only if necessary, thereby simplifying the managing of a link, and preventing an excessive 35% reduction of throughput caused by use of unnecessary FEC.
摘要:
An apparatus and method for managing traffic using a VID in EPON are provided. The apparatus includes a MAC lookup table, a service classification policy table, a service control policy table, a MAC lookup unit, a first and second classification module, a VID learning unit and a first and second service control module. The apparatus classifies all packets of up/downlink transmission flow using a VID into a VID unit, through the first and second classification modules and manages traffic thereof according to the parameters thereof through the first and second service control modules. Accordingly, a large amount of traffic for numerous subscribers and services thereof, which was cannot be processed by the limitation on embodying a typical switch or router, can be processed according to the present invention.
摘要:
A semiconductor package substrate may include a first semiconductor chip, a second semiconductor chip, plugs and interconnection terminals. The second semiconductor chip may be arranged on an upper surface of the first semiconductor chip. The first and second semiconductor chips may have corresponding first regions and corresponding second regions. Conductive plugs may be built only in a first region of the first semiconductor chip. Circuitry of the second semiconductor chip may only be electrically connected to the first semiconductor chip through the conductive connectors corresponding to the first regions of the first and second semiconductor chips.
摘要:
There are provided a method and apparatus for transmitting and receiving signals in the same frequency band at the same time. A signal is received using a dual polarization antenna, the main axis of the polarization of the reception signal is predicted by performing adaptive polarization tracking, and polarization filtering is performed in order to remove interference. A signal is transmitted through a polarization completely orthogonal to the tracked polarization. In accordance with the present invention, in a wireless communication system, signals can be transmitted and received in the same frequency band at the same time.