Multiplex communications – Wide area network – Packet switching
Patent
1991-03-27
1993-07-13
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
375114, 375116, H04J 306
Patent
active
052280373
ABSTRACT:
A line interface for high-speed line capable of detecting not only errors occurred on the line but also errors occurred in itself. A first multiplex cifcuit multiplexes a transmission frame synchronizing (sync) signal with data to be transmitted to the line and sends the multiplexed signal as a signal to be transmitted. A second multiplex circuit multiplexes the signal to be transmitted with a signal received from the line. A frame sync circuit synchronizes in phase to both of the received signal and signal to be transmitted multiplexed by the second multiplex circuit and, when not failed to synchronize, outputs a frame error signal. A demultiplex circuit separates data to be transmitted and received data from the output signal of the second multiplex circuit. A pattern comparator compares the data to be transmitted outputted by the demultiplex circuit and the data to be transmitted fed to the first multiplex circuit and, if they are not identical, produces a data non-coincidence signal.
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patent: 4860283 (1989-08-01), Takano et al.
patent: 4860323 (1989-08-01), Malter
patent: 4910754 (1990-03-01), Allen et al.
patent: 5007088 (1991-04-01), Ooi et al.
patent: 5010559 (1991-04-01), O'Connor et al.
patent: 5033044 (1991-07-01), Williams et al.
patent: 5063564 (1991-11-01), Crandall et al.
NEC Corporation
Olms Douglas W.
Ton Dang
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