摘要:
An OLT transmits and receives a CMTS/CM apparatus control signal through an apparatus physical management interface which is physically identical to or different fro a main signal interface (NNI) and processes the CMTS apparatus control signal by itself. When connection of a new ONU is detected by an ONU apparatus control signal, an IP address is allocated by using the CM apparatus control signal in a manner similar to the CM. The CM apparatus control signal regarding the ONU is transmitted and received by using the IP address and a mutual conversion is performed between the CM apparatus control signal and the ONU apparatus control signal. The ONU processes the ONU apparatus control signal in a manner similar to the ONU based on an ordinary PON standard.
摘要:
An ATM switching system comprises a switch unit including a plurality of input ports and a plurality of output ports having the same cell transmission rate, and a multiplexer for multiplexing cell trains outputted from at least two output ports into a single cell train and outputting the cell train to a high-speed output line (and/or a demultiplexer for demultiplexing a cell train from an output port into a plurality of cell trains and outputting the cell trains to a plurality of low-speed output lines). The switch unit includes a buffer memory for temporarily storing cells inputted from the input ports while forming a queue chain for each output line to which each cell is to be outputted, a demultiplexer for distributing the cells read from the buffer memory among the output ports in circulation, and a buffer memory control circuit for controlling the write and read operation of cells with the shared buffer memory. The buffer memory control circuit has a control table device for outputting an identifier of an output line to which the cells read from the shared buffer memory are to be outputted, and cells are read from the chain designated by the output line identifier outputted from the control table device.
摘要:
A switching system for integratedly switching voice, data, image information and the like. The switching system comprises a plurality of front-end modules each adapted to perform a switching processing in association with a subscriber line or a trunk line, and a single or a plurality of central modules for interconnecting the plurality of front-end modules in star-type fashion and switching information prevailing between the front-end modules, in unit of block accommodating the information and a header added thereto to contain connection control information and in accordance with the contents of the header. The front-end modules are connected to the central module via inter-module highways each having frames occurring at a predetrmined period and time slots contained in each frame to carry blocks.
摘要:
A switching system for integratedly switching voice, data, image information and the like. The switching system comprises a plurality of front-end modules each adapted to perform a switching processing in association with a subscriber line or a trunk line, and a single or a plurality of central modules for interconnecting the plurality of front-end modules in star-type fashion and switching information prevailing between the front-end modules, in unit of block accommodating the information and a header added thereto to contain connection control information and in accordance with the contents of the header. The front-end modules are connected to the central module via inter-module highways each having frames occurring at a predetermined period and time slots contained in each frame to carry blocks.
摘要:
In communication nodes inserted in a ring-shaped or bus-shaped transmission path, a transmitting section writes transmission packets into transmission buffers in a predetermined order and sends out the transmission packets in the predetermined order onto the transmission path at appropriate unoccupied time of the transmission path, whereas a receiving section temporarily stores packets directed to its own node into a receiving buffer and reads out the packets in the same order as that of writing them into the transmission buffers in the transmitting section.
摘要:
A multi-stage link switch includes first, second and third switch elements, each of the first, second and third switch elements having a predetermined plurality of incoming terminals and a predetermined plurality of outgoing terminals. Communication information is switched between a plurality of incoming highways and a plurality of outgoing highways based on information in each of a plurality of cells. Each cell has fixed length and is transmitted by each of the incoming highways to the plurality of outgoing highways. The multi-stage link switch includes a primary stage including a plurality of the first switch elements, each input terminal of each first switch element is connected to a corresponding one of the input highways, an intermediate stage including a plurality of the second switch elements, each input terminal of each of the second switch elements is being connected to a corresponding one of the output terminals of a corresponding one of the first switch elements of the primary stage, and a last stage including a plurality of the third switch elements, each input terminal of each of the third switch elements being connected to a corresponding one of the output terminals of a corresponding one of the second switch elements in the intermediate stage. Each outgoing terminal of each of the third switch elements is connected to a corresponding one of the outgoing highways.
摘要:
In a packet communication method, a packet communication device, an input transmission frame of V (bytes/sec) consisting of a transmission overhead of V.sub.OH (bytes/sec) containing control information for transmission and a pay load of V.sub.p (bytes/sec) of c (=a+b) bytes, the outer cell consisting of an information field of a b-byte length containing transmission data and a header field of an a-byte length containing a first control information for transmitting the information field. The transmission overhead is removed from and a second control information is added to the input transmission frame. The input transmission frame with the second control information and without the transmission overhead is converted to a plurality of inner cell trains of f (=b+j) bytes length, the inner cell trains consisting of an information field of a b-byte containing the transmission data and a second header field of j (=a+d) bytes consisting of the first control information and the second control information (where f.times.g=h.times.V, h is an integer or a fraction of an integer). Packets switching are performed on each inner cell. A plurality of inner cells are converted to an output transmission frame of V (bytes/sec) having the same format as the input transmission frame for transmission.
摘要翻译:在分组通信方法中,分组通信装置,包含包含用于传输的控制信息的VOH(字节/秒)的发送开销和Vp(字节/秒)的支付负荷的V(字节/秒)的输入传输帧, 由c(= a + b)字节组成的外部单元,包括包含传输数据的b字节长度的信息字段和包含用于发送信息字段的第一控制信息的a字节长度的报头字段。 传输开销被删除,第二控制信息被添加到输入传输帧。 具有第二控制信息并且没有传输开销的输入传输帧被转换为f(= b + j)字节长度的多个内部小区列,内部小区列由包含以下内容的b字节的信息字段组成: 发送数据和由第一控制信息和第二控制信息组成的j(= a + d)字节的第二标题字段(其中fxg = hxV,h是整数或整数的分数)。 在每个内部单元上执行分组切换。 多个内部单元被转换为具有与用于传输的输入传输帧相同格式的V(字节/秒)的输出传输帧。
摘要:
In the ATM switching system, an ATM speech path is divided into a plurality of functional blocks. A routing function for distributing cells (packets) each of a fixed length to addresses outgoing lines and a logical multiplexing function are imparted to a switch, while other functions associated with a line typified by a phase synchronizing function and a flow control function are incorporated en bloc in ATM line terminating units and functions capable of being processed by hardware in common to the lines are assembled in a line common unit. The ATM line terminating unit physically terminates transmission lines and performs the processing relevant to header information of the cells each of a fixed length (ATM terminating processing) and includes a cell phase synchronizing circuit for matching the temporal positions of the cells among the lines and a flow control circuit for avoiding overload exceeding the load declared by subscriber terminal. The line common unit serves for processings of call control signals and the calls and includes a signal processing circuit and a control circuit. The switch performs cell multiplexing and switching and is constituted by a self-routing switch.
摘要:
An OLT transmits and receives a CMTS/CM apparatus control signal through an apparatus physical management interface which is physically identical to or different from a main signal interface (NNI) and processes the CMTS apparatus control signal by itself. When connection of a new ONU is detected by an ONU apparatus control signal, an IP address is allocated by using the CM apparatus control signal in a manner similar to the CM. The CM apparatus control signal regarding the ONU is transmitted and received by using the IP address and a mutual conversion is performed between the CM apparatus control signal and the ONU apparatus control signal. The ONU processes the ONU apparatus control signal in a manner similar to the ONU based on an ordinary PON standard.
摘要:
A passive optical network (PON) system which enables plural types of ONUs having different signal transmission speeds to be connected to one OLT. An optical line terminating apparatus (OLT) connected to plural types of ONUs having different signal transmission speeds through an optical distribution network includes an optical transmitter-receiver connected to the optical distribution network, a transmission/reception line interface connected to a wide area network, a downstream frame processing section for converting a packet received by the transmission/reception line interface from the wide area network into a downstream frame containing identification information on a destination ONU in a header, and a downstream transmission controller for modulating the downstream frame at a speed corresponding to a signal transmission speed of the destination ONU and outputting the modulated frame to an electrical/optical converter connected to the optical transmitter-receiver.