Token ring synchronization
First Claim
1. In a local network of the type described in ANSI/IEEE Standard 802.5, a node having a a ring monitor circuit and a reclocking circuit operably alternatively to one another, said network node including a receiver-demodulator incorporated a first phase locked loop and having an input connectable to the network and having an output providing received data and an output providing a received clock, an elasticity buffer connected to the received data output of said receiver-demodulator, and means for modulating said received data onto a clock signal extracted from said received clock, an improvement wherein said reclocking circuit includes:
- a second phase-locked loop connected in a transmission line between said received clock output of said receiver-demodulator and a received data input to said means for modulating, the bandwidth of said second phase-locked loop being narrower than the bandwidth of said first phase-locked loop.
2 Assignments
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Accused Products
Abstract
An improved local area network node of the type described in ANSI/IEEE Standard 802.5, including a receiver-demodulator having an input connectable to the ring and having a received data output and a received clock output, an elasticity buffer connected to the received data output, a modulator for modulating the output of the buffer in accordance with a signal at a clocking input of the modulator, and a phase-locked loop interposed between the received clock output of the demodulator and the clocking input of the modulator, the loop including a voltage-controlled oscillator, a phase detector and a filter connected for providing a control-voltage to the oscillator.
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Citations
6 Claims
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1. In a local network of the type described in ANSI/IEEE Standard 802.5, a node having a a ring monitor circuit and a reclocking circuit operably alternatively to one another, said network node including a receiver-demodulator incorporated a first phase locked loop and having an input connectable to the network and having an output providing received data and an output providing a received clock, an elasticity buffer connected to the received data output of said receiver-demodulator, and means for modulating said received data onto a clock signal extracted from said received clock, an improvement wherein said reclocking circuit includes:
a second phase-locked loop connected in a transmission line between said received clock output of said receiver-demodulator and a received data input to said means for modulating, the bandwidth of said second phase-locked loop being narrower than the bandwidth of said first phase-locked loop. - View Dependent Claims (2, 3, 4)
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5. In a local area network of the type described in ANSI/IEEE Standard 802.5, having a set of reclocking nodes serially connected to a transmission medium so that information bits may be transferred sequentially from one active node to the next, an improvement wherein at least one of said reclocking nodes comprises:
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a receiver-demodulator including a first phase-locked loop and having an output providing received data and an output providing a received clock; an elasticity buffer having its input connected to said received data output and its output connected to the received data input of said means for modulating; means for modulating said received data onto a clock signal extracted from said received clock; and a second phase-locked loop connected between said received clock output of said receiver-demodulator and a received clock input to said means for modulating. - View Dependent Claims (6)
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Specification