Abstract:
The device for discriminating synchronous transfer mode cell boundary using a 5-byte syndrome generator includes: a HEC (Header Error Control) decoding means 10 for generating the syndrome for successive 5 byte data from byte data streams based on a syndrome load signal and a syndrome reset signal and an external input data, extracting the cell boundary, and correcting a single bit error in the cell header; an HEC state tracing means 30 for checking whether a mode set signal provided from the HEC decoding means 10 is in a tracing state, a semi-synchronous state, or a synchronous state; and an HEC driving means 20, for providing the syndrome load signal and the syndrome reset signal, providing the mode signal to the HEC state tracing means 30 and having a plurality of bits error detection, the HEC mode detection, an effective cell transferring functions.
Abstract:
본 발명은 전용 방송 버스 구조를 갖는 소규모 출력 버퍼형 ATM 스위칭 장치에서 주요 기능 처리부인 출력 처리부의 구성을 두단계 버퍼링 방법과 속도 이득 방법 및 입력셀들의 동기/비동기 상태에 무관하게 동작하는 방법을 이용하여 입력 포트수가 16이하인 소규모 출력 버퍼형 ATM 스위칭 장치를 장치 구성에 소요되는 버퍼수의 절감효과 및 버스트 트래픽 처리 기능이 우수하고 내부 제어가 간단하도록 구성한 출력 버퍼형 에이.티.엠(ATM)스위칭 장치에 관한것으로, 일반적인 출력 버퍼형 스위칭 장치보다 소요 버퍼의 축소 효과를 제공하면서,기존의 넉 아웃 스위칭 장치는 제어 방식기 갖는 장점보다는 장치의 구성이 상대적으로 복잡하나 본 발명은 장치의 용량이 16이하인 소규모일 경우로 한정하여 보다 장치의 구성을 단순화시키면서도 한 출력 접 속부로 셀이 동시에 몰리는 트래픽에 대한 처리 특성을 강화시킨다.
Abstract:
a transmitting cell matching part having an ATM cell transmitting block which buffers a cell transmitted from an ATM hierarchy to output the buffered cell according to a control signal, an OAM(operation and maintenance) cell transmitting block which buffers an OAM cell transmitted from a physical hierarchical managing unit to output the buffered cell according to the control signal, an idle cell generating block which transmits an idle cell if the ATM cell and the OAM cell do not exist, and a multiplexor which mulitiplexes the ATM cell, the OAM cell, and the idle cell in accordance with the control signals from a transmitting cell matching part control block; and a receiving cell matching part having a receiving cell dividing block which divides types of receiving cells, a receiving cell matching part control block which controls an overall function of a receiving part, an OAM cell receiving block which stores the divided OAM cell to transmit the cell to the physical hierarchical managing unit, and an ATM cell receiving block which stores the divided ATM cell to transmit the cell to the ATM hierarchy.
Abstract:
a slot discriminator for discriminating an activated slot from an effective slot, the activated slot having an effective cell information from an input cell slot, and the effective slot not having the effective cell information; a pre-input/output unit for selectively outputting a buffering when a service holding signal is inputted through an input of the cell slots discriminated from the slot discriminator; an off section recognizing unit for recognizing an off section between the number of effective slots of the slot discriminator, and for finding out a start point of a burst; a burst length observing unit for counting the length of the burst from the start point of the burst under use of an off section signal from the off section recognition unit and an active slot signal from slot discriminator, comparing the length of the burst with the maximum length of a determined burst, and outputting a maximum burst length disobedience signal during disobedience; and a service holding unit for generating a service holding signal when the maximum burst length disobedience signal is sensed from the burst length observing unit, and buffering the cell slots inputted to a selective buffering pre-input/output unit.
Abstract:
The apparatus and method is for detecting real time overhead byte of STM-1 frame. The apparatus includes a 3-phase signal generator(21) for generating signals needed to BIP24 calculation, a position signal generator(22) for generating enable signals for special bytes(B2,Z2) in section overhead bytes, and an overhead generator(23) for executing BIP24 calculation, for generating a section overhead byte(Z2), and for storing whole overhead.
Abstract:
an information input and state definition means which selects and presents priority data by receiving state information of each input buffer and by receiving priority information of each input presented by ATM layer controller ; a control signal generating means which controlls the output of cell generator or each input buffer of cell multiplication part by comparing the priority data selected at the information input and state definition means.
Abstract:
The multiplexer comprises an input cell receiving unit for inputting a protocol cell data provided from a service data, i.e., ATM cell, and a layer controlling part, storing the cell data inputted to a corresponding connection point of an input buffer, and outputting state information of each input buffer, which is differently shown according to feature of the input cell data; an idle/non-assignment cell generating unit for generating a spare cell and a non-assignment cell in order to fill a cell stream of a bite unit corresponding to a STM-1 frame format and a transmission format of a cell environment when the data is not accumulated in the input buffer; a cell multiple controlling unit for inputting a specific information of the input data provided from the ATM layer controlling part and a state information outputted from the input cell receiving unit, and outputting one of control signals to be used for selecting either the cell data to be multiplexed, or the idle/non-assignment cell data; and a cell multiplexing unit inputting the control signal from the cell multiple controlling unit, and outputting multplexing data by abstracting the cell data of the input cell receiving unit and the idle/non-assignment cell data from the cell stream of the bite unit.