Synchronization of non-continuous digital bit streams

Details Synchronization of non-continuous digital bit streams Synchronization of non-continuous digital bit streams

1988-03-31

1990-12-11

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

370108, H04L 706

Patent

active

049775820

ABSTRACT:
A high capacity metroplita, area network (MAN) is described. Data traffic from users is connected to data concentrators at the edge of the network, and is transmitted over fiber optic data links to a hub where the data is switched. The hub includes a plurality of data switching modules, each having a control means, and each connected to a distributed control space division switch. Advantageously, the data switching modules, whose inputs are connected to the concentrators, perform all checking and routing functions, while the 1024x1024 maximum size space division switch, whose outputs are connected to the concentrators, provides a large fan-out distribution network for reaching many concentrators from each data switching module. Distributed control of the space division switch permits several million connection and disconnection actions to be performed each second, while the pipelined and parallel operation within the control means permits each of the 256 switching modules to process at least 50,000 transactions per second. The data switching modules chain groups of incoming packets destined for a common outlet of the space division switch so that only one connection in that switch is required for transmitting each group of chained packets from a data switching module to a concentrator. Data streams from different inputs of the space division switch to a concentrator are synchronized to a clock by a circuit that detects the delay between a clock transition and an initial data signal transition and by a circuit for delaying the signal from the space division switch in accordance with the detected delay.

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