SALTO Virtual Network (SVN) is a Data-on-Card system based on the patented read-write technology. SVN allows you to store all user login information on identification media (card, key ring, etc.). The respective access rights are updated on the Update terminals, which are connected online to the server, with or without cabling, via a wireless network. All other access components, such as electronic front plates and cylinders, are battery powered and are virtually connected to the network via the identification media.