Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Patent
1997-07-17
2000-06-27
Patel, Ajit
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
375371, 370516, H04J 306
Patent
active
060815388
ABSTRACT:
A network node for receiving a packet of data written from the network and providing the packet to the network. The packet of data includes first data received from the network in response to a first clock signal and second data provided to the network in response to a second clock signal. The node is adapted to compensate for a drift between the first clock signal and the second clock signal. The node includes a first counter that receives the first clock signal and produces a write-point signal in response to the first clock signal. The node also includes a plurality of registers arranged in a wrap-around configuration, with a first one of the registers coupled to be selected by the write-point signal to receive the first data from the network. A second counter receives the second clock signal and produces a read-point signal in response to the second clock signal, with a further register being selected by the read-point signal to provide the second data to the network. A comparison block receives the read-point signal and the write-point signal and compares the read-point signal and the write-point signal to detect the drift between the first clock signal and the second clock signal, and generates an output signal representing the drift. A control block receives the output signal from the comparison block and generates a signal to the second counter to adjust the read-point signal to compensate for the drift between the first and the second clock signals.
REFERENCES:
patent: 5103467 (1992-04-01), Bedlek et al.
patent: 5134636 (1992-07-01), Barucchi et al.
patent: 5241543 (1993-08-01), Amada et al.
patent: 5428649 (1995-06-01), Cecchi
Adornato Rocco L.
Patel Ajit
Samuels Steven B.
Starr Mark T.
Unisys Corporation
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