Racal Data Communications Inc.

Racal-datacom, Inc.

Jack E Stephenson

Jay P Jayapalan

Ming-Luh Kao

William J Miller

Stephen J Winter

Jerry A Miller

Charles R Baugh

Chun C Lu

Disclosed is a frame processing engine for receiving and processing a data frame having a header and a payload, comprising a first memory for receiving at least a portion of the header of the data frame; a second memory for receiving the payload of the data frame; and a controller, upon receipt of the data frame, for storing the header (at least most of it) in the first memory and the remainder of the data frame (including the payload) in the second memory, with the first memory having a shorter access time than the second memory.

Performance enhancing memory interleaver for data frame processing

A method of providing B channel diagnostics to an integrated services digital network (ISDN) comprises the steps of monitoring error performance on the ISDN D channel and comparing the D channel error performance to a predetermined criterion as a measure of the B channel error performance. If the predetermined threshold is exceeded any of a number of possible actions can be taken by a network diagnostics controller including various loopback tests, alerts or network reconfiguration.

Access circuit diagnostics for integrated services digital network

A digital voice communication apparatus having improved echo suppression includes a transmission gain detection circuit for detecting a near talker signal and a receiver gain detection circuit for detecting a far talker signal. An echo detecting circuit detects which of the near talker and far talker signals has a lesser value and suppresses the gain of the one detected to have the lesser value. A far talker suppressing circuit detects whether the most recent peak gain in this near talker signal is greater than a threshold and is greater than the gain of the far talker signal. If this condition exists the far talker signal is suppressed. A near talker signal suppressing circuit detects whether the most recent gain of the far talker signal is greater than a threshold and is greater than the gain of the near talker signal. If so, the gain of the near talker signal is suppressed.

Digital voice transmission having improved echo suppression

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Davie, FL, United States of America

Jack E Stephenson