Description:
On LANCOM devices with LCOS the function of the DSL interfaces is controled by the first DSL interface (DSL-1). Thus it is a global switch.
Therefore when using a DSL interface deviating from DSL-1 the interface DSL-1 in the menu Interfaces → WAN → Interface settings has to stay active even if the interface DSL-1 itself isn't used.
LANCOM Systems recommends to use the DSL interfaces in order of appearance and therefore start with DSL-1.