D-Link DSL-302G, Быстрое руководство по установке

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Appendix
Micro-filters are obtained from your DSL provider and must be installed on
every normal telephone in the house, apartment or office where you are
installing the DSL modem. Micro-filters ensure that the new DSL data signal
and the normal voice signal do not interfere with each other as they travel on
the same telephone line.
Installing Micro-filters
Install a micro-filter on every telephone other than the one used for the DSL
modem. If it’s not a DSL modem, it needs a micro-filter.