公开(公告)号：US5550802A

公开(公告)日：1996-08-27

申请号：US385086

申请日：1995-02-07

Applicant: Debra J. Worsley ,  Geetha N. K. Rangan ,  Brian C. Edem ,  Michael S. Evans

Inventor： Debra J. Worsley ,  Geetha N. K. Rangan ,  Brian C. Edem ,  Michael S. Evans

IPC: F02B75/02 ,  H04L12/44 ,  H04L12/64 ,  H04J3/12

CPC classification number: H04L12/6418 ,  H04L12/44 ,  F02B2075/025 ,  H04L2012/644 ,  H04L2012/6454 ,  H04L2012/6459

Abstract: The present invention provides for communication of data to and from isochronous data sources and sinks. Preferably, a portion of bandwidth on the link is also dedicated to convey data to and from non-isochronous sources and sinks, as well as to permit conveying housekeeping information (such as information relating to data sources and destinations) and status and control maintenance information. A management port is included in the isochronous switching devices to allow monitoring or diagnostic access to the serial isochronous data stream to and from all physical layer portion connections. Accessing one connection's data stream does not affect normal operation of the other connections.

Abstract translation: 本发明提供数据与等时数据源和汇的通信。 优选地，链路上的带宽的一部分还专用于将数据传送到非等时源和汇，并且允许传送内务信息（例如与数据源和目的地有关的信息）以及状态和控制维护信息 。 等时切换设备中包括一个管理端口，以允许监视或诊断访问与所有物理层部分连接的串行同步数据流。 访问一个连接的数据流不会影响其他连接的正常操作。

公开(公告)号：US5506846A

公开(公告)日：1996-04-09

申请号：US226403

申请日：1994-04-12

Applicant: Brian C. Edem ,  Debra J. Worsley ,  Michael S. Evans

Inventor： Brian C. Edem ,  Debra J. Worsley ,  Michael S. Evans

IPC: H04J3/22 ,  H04L12/44 ,  H04L12/46 ,  H04L12/64

CPC classification number: H04L12/44 ,  H04L12/64 ,  H04L12/6418 ,  H04L2012/6437 ,  H04L2012/6448 ,  H04L2012/6459

Abstract: A data communication system such as a local area network or a wide area network capable of transmitting isochronous data. The system conveys both isochronous data and non-isochronous data by time multiplexing data into a recurring frame structure on a 4-bit nibble basis. The arriving data is de-multiplexed at a hub into separate channels which are forwarded to separate hardware appropriate for handling the particular data stream. The data is passed hierarchically from a source, through a node, and to a hub. The hub places the data into an internal connection memory for switching onto a high bandwidth bus for distribution to other destination hubs, nodes, or sinks, except, where the source node and destination node are attached to the same hub, the hub provides a local loopback to the destination node, thus avoiding the need to place the transmitted data onto the bus. This system conserves room on the bus for other isochronous and non-isochronous data.

Abstract translation: 数据通信系统，例如能够发送等时数据的局域网或广域网。 该系统通过将数据时间复用为4比特半字节的重复帧结构来传送同步数据和非同步数据。 到达的数据在集线器处被解复用为分离的信道，这些信道被转发到适于处理特定数据流的独立硬件。 数据从源，通过节点和集线器分层传递。 集线器将数据放入内部连接存储器中，用于切换到高带宽总线以分发到其他目标集线器，节点或接收器，除了源节点和目标节点附加到同一集线器之外，集线器提供本地 环回到目的地节点，从而避免将发送的数据放置在总线上的需要。 该系统节省了其他同步和非同步数据的总线空间。

公开(公告)号：US5361261A

公开(公告)日：1994-11-01

申请号：US970329

申请日：1992-11-02

Applicant: Brian C. Edem ,  Debra J. Worsley

Inventor： Brian C. Edem ,  Debra J. Worsley

IPC: H04L12/56 ,  H04L12/44 ,  H04L12/64 ,  H03M7/00 ,  H04J3/02

CPC classification number: H04L12/6418 ,  H04L12/44 ,  H04L2012/6437 ,  H04L2012/6448 ,  H04L2012/6459

Abstract: A network for transferring packet data in a frame structure, preferably mixed with isochronous data is provided. The frame structure is a continuously repeating structure, with each frame having a number of time slots. Certain ones of the time slots are available for transmitting packet data. The packet data is re-timed, e.g., by using a FIFO to output the data nibble-wise as required by the frame structure. Similar re-timing can be used for isochronous data so that the frame structure defines time-division multiplexing of the packet data and isochronous data. A four/five encoding scheme provides sufficient encoding efficiency that both the packet data and other data can be accommodated without degrading the data rate of the packet data. The encoding scheme provides extra symbols which can be used for transferring "no carrier" information, or "frame alignment" messages. Preferably, the frame structure is translated to and from a packet structure to permit the present invention to be used with previously available packet circuitry such as a media access controller and a hub repeater circuit. Latency of the FIFO can be reduced by pre-filling with packet preambles, and/or sub-latency propagation of preamble bytes, or providing special MACs which do not output preambles, and using the buffer circuitry to output preambles.

Abstract translation: 提供了一种用于以帧结构传送分组数据的网络，优选地与等时数据混合。 帧结构是连续重复的结构，每个帧具有多个时隙。 某些时隙可用于发送分组数据。 分组数据被重新定时，例如通过使用FIFO来按照帧结构的要求以数字方式输出数据。 类似的重新定时可以用于等时数据，使得帧结构定义分组数据和等时数据的时分复用。 四/五编码方案提供了足够的编码效率，可以容纳分组数据和其他数据，而不降低分组数据的数据速率。 编码方案提供了可用于传送“无载波”信息或“帧对准”消息的额外符号。 优选地，帧结构被转换成分组结构并且从分组结构转换为允许本发明与先前可用的分组电路一起使用，诸如媒体接入控制器和集线器中继器电路。 FIFO的延迟可以通过预填充分组前导码和/或前导码字节的子延迟传播，或提供不输出前导码的特殊MAC，以及使用缓冲电路来输出前导码来减少。