Multiplex communications – Wide area network – Packet switching
Patent
1990-10-26
1992-06-16
Chin, Stephen
Multiplex communications
Wide area network
Packet switching
3701001, 370103, 379407, H04J 100, H04J 300, H04J 306
Patent
active
051230097
ABSTRACT:
A method and apparatus for disabling an echo canceller in a digital telephone network. An originating DSU transmits a sequence of synchronization codes which are shifted by the various delays in the network. The answering DSU receives the shifted codes and determines how much adjustment is required by the originating modem in order to have byte boundaries aligned with those of the network. The answering DSU then transmits this information back to the originating DSU so that the originating DSU can adjust its transmit time to align with the byte boundaries of the network. The originating DSU then transmits byte aligned 2100 Hz tone samples in order to disable the network's echo canceller.
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Chin Stephen
Kizou H.
Racal Data Communications Inc.
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