D-Link DSL-G624T User Manual page 97

Split Line Filter
If you are instructed to use a split line filter you must install the device between the Router and the phone jack. Use
standard telephone cable with standard RJ-11 connectors. The splitter has three RJ-11 ports used to connect to the wall
jack, the Router and if desired, a telephone or telephone device. The connection ports are typically labeled as follows:
Line - This port connects to the wall jack.
ADSL – This port connects to the Router.
Phone – This port connects to a telephone or other telephone device.
DSL-G624T Wireless A DSL Router User's Guide
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