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GMW GMW3089 GMLAN Single Wire CAN Physical and Data Link Layers Specification
standard by General Motors Worldwide , 12/01/2002
1.1 Scope.
This document specifies the physical layer requirements for a Carrier Sense Multiple Access/Collision Resolution (CSMA/CR) data link which operates on a single wire medium to communicate among Electronic Control Units (ECU) on road vehicles at normal transmission rates of 33.333 Kbits/s and at a special high speed assembly or service transmission bit rate of 83.333 Kbits/s.