초록 ▼

A distributed synchronization system for use in each node of a distributed asynchronous telecommunications network system that continually monitors and controls the flow of data through an implementing node to prevent dataflow errors due to phase and frequency differences in source and destination n

A distributed synchronization system for use in each node of a distributed asynchronous telecommunications network system that continually monitors and controls the flow of data through an implementing node to prevent dataflow errors due to phase and frequency differences in source and destination nodal clocks, and to control inter-nodal network latency so as to support the transmission of synchronous data. A synchronization data FIFO buffers predetermined fields or portions of fields of a unique frame packet received from a source node before retransmission to a destination node on the network. The frame packet includes a frame synchronization field indicating the beginning of a new frame packet; a payload field containing valid data; and a dead zone field providing bandwidth during which the present invention performs synchronization functions. A frame synchronization subsystem, implemented in a designated master node, guarantees that a frame is released at the beginning of an independently-determined frame regardless of network latency. A word resynchronization subsystem manages the flow of data through the data FIFO of each non-master node, receiving and storing data at the source node's clock rate and transmitting the data according to its own clock, thereby guaranteeing the efficient receipt and transmission of data between asynchronously-communicating nodes.

대표청구항 ▼

[ What is claimed is:] [1.]1. A distributed synchronization system for use in a node of an expandable telecommunications system including a plurality of nodes interconnected by an inter-nodal network, with one of said nodes being a master node, the system, comprising:a synchronization data memory im

[ What is claimed is:] [1.]1. A distributed synchronization system for use in a node of an expandable telecommunications system including a plurality of nodes interconnected by an inter-nodal network, with one of said nodes being a master node, the system, comprising:a synchronization data memory implemented in a master node and each of said nodes which are non-master nodes for storing predetermined portions of an inbound frame packet received from a source node and from which information is retransmitted to a destination node on the network;a frame synchronization subsystem implemented in said master node, and connected in communicating relationship with said memory, configured to release an outbound frame packet at the beginning of an independently-determined frame cycle, based upon the occurrence of a local frame synchronization pulse, and wherein said frame packets include a frame synchronization field indicating the beginning of a new frame packet, a payload field containing valid data and a dynamically-adjustable dead zone comprising a non-valid data field; anda word resynchronization subsystem implemented in said master node and each non-master node and connected in communicating relationship with said memory and configured to control storage of said predetermined portions using a recovered source node clock signal and to control retransmission of said information according to a local clock signal, such that each non-master node receives a frame packet at predetermined interval of time whereby dataflow errors due to phase differences in source and destination nodal clocks are substantially avoided.