Two types of virtual connections
	Permanent Virtual Circuits (PVC) are set up by the operator on a permanent (or long-term) contract basis PVC set-up via network management tools No signalling required Switched Virtual Circuits (SVC) are controlled by user signaling (ITU-T Q.2931) Set-up and release of ATM virtual connections requires signalling (like PSTN/ISDN) Signalling channels are set-up on a permanent basis
			Broadband ISDN