2N NetStar Hardware manual - Manual (Page 35)

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2.11 4ASL/4AVL Card
The card contains 4 ASL ports and 4 AVL ports.
In case of power supply shortage the ASL ports are 1:1 switched to the AVL
ports.
We recommend to only connecting the telephone sets, which do not need
additional power supply and are in compliance with the basic requirements and
further respective provisions and stipulations of the 1999/5/ES Directive to the
AVL ports.
The card can be installed into any line position of the basic or the extension
modules.