Clear Collision is the simultaneous SVC disconnection, SwitchesVirtual Circuit (SVC), by the data transmission device (DCE) and the data termination device (DTE) on the same logical channel
. In X.25, when a connection is cleared, there is first a Clear Request and then a Clear Confirmation. X.25 assumes that the clear request comes from only one of the two participants. If the clear request comes from both parties at the same time, there is a clear collision, but this has no consequences because X.25 is set up for this.