Excellent as a replacement for defective DSL-Modems suitable for lightning damage. In addition, many older modems are not covered for the actual maximum speed ADSL2 + with 24 000 k Bit/s & contract must be replaced when moving to a new DSL Contract. If you want to introduce a router without integrated DSL-Modem, this device is simply inserted between your router & the splitter (at the phone jack).