Information transmission system in a local area network suitable for collision detection

摘要

An information transmission system in which a plurality of data terminal equipments (DTEs) are coupled with a communication medium through corresponding medium attachment units (MAUs). The DTE transmits and receives an information signal in a format having a preamble section including a predetermined bit pattern and a data section. The MAU modulates and demodulates the information signal. The MAU is arranged to replace part of the preamble with random data in order to quickly detect the collision of information signals from a plurality of DTEs on the communication medium.