Method and device for checking the connection of a positive supply voltage to a subscriber access line comprising a plurality of wires

A device for checking the connection of a supply voltage from a subscriber line interface circuit to a subscriber access line which has a plurality of wires for connection of at least one subscriber to at least one communication network, the device having a unit for, without decoupling the subscriber access line from the communication network and without generating a call signal on the subscriber access line:

• connecting an impedances between two wires of the subscriber access line,
• switching the subscriber access line to a call pause mode in which only a direct-current component of a ringing voltage is applied to the subscriber access line,
• determining at least one electrical property, wherein the electrical property is selected from the group consisting of a current flowing in the wires of the subscriber access line and a voltage between one of the wires and ground;
• checking whether or not the supply voltage is present on the subscriber access line;
• and
• verifying whether or not the subscriber line interface circuit is fundamentally able to feed a pre-determined current to the subscriber line.