the condition at the DTE/DCE interface which denotes that the data circuit terminating equipment is not ready to accept a call request signal or that the data terminal equipment is not ready to accept an incoming signal Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=721-17-47
the condition at the DTE/DCE interface which denotes that the data circuit terminating equipment is not ready to accept a call request signal or that the data terminal equipment is not ready to accept an incoming signal