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Transmission Code for CSMA/CD

IP.com Disclosure Number: IPCOM000034243D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27

Publishing Venue

IBM

Related People

Authors:
Haas, LC [+details]

Abstract

The detection of transmission collisions between stations using a CSMA/CD access method is important and difficult. In order to perform the collision detection function many systems require careful balancing of the signals by controlling the path loss and/or the transmitted signal. Other CSMA/CD systems must add additional equipment that performs or aids the detection of collisions but does not otherwise increase the transmission performance. This transmission code provides for the detection of collisions, eliminating the need to match transmission levels and does not require additional monitoring equipment. In addition, no increase in bandwidth is required. The signal is baseband, and removes any DC from the NRZI (non-return to zero invert) input data stream.