2N NetStar Hardware manual - Manual (Page 31)

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2.9 DVL Card
The DVL card contains 8 ports used for the connection of the Star Point digital
telephone sets.
the board always contains two sources of power per each four ports 0,1,2,3 a
4,5,6,7. If there occurs a short–circuit in the wiring (e.g. because of connection
of an analogue phone), the power supply will be disconnected. After the technical
deficiency was repaired, the power supply source will start to feed power into the
ports again.
The card is only installed into the position of the line card of the basic module.