Method and an apparatus for early bit collision detection

摘要

Disclosed is a unit for interfacing an 82586-type local-communications controller to a modem of the type used in an RF network, the unit employing both an NRZI-to-NRZ converter which includes an algorithmic-state machine for converting packets encoded in NRZI format to NRZ format and for recovering the clocking information and a comparator for comparing successive check-sum portions derived from a packet for transmission in the network with similar portions derived from an echo packet received from the network to detect a packet collision.