D-Link DSL-100D Quick Install Manual page 5

Filter Installation Tips
DO NOT install a filter on your DSL modem or on any broadband
devices.
Check the orientation of each filter.
1. PHONE jack towards the telephone device.
2. LINE connection towards the wall jack.
Try to limit the number of filters in your home to the fewest practical.
Do this by:
1. Using one filter to isolate several devices.
2. Not installing filters on unused phone jacks.
Do not use more than one filter for each telephone device or group of
devices.
Plug the filter directly into the wall jack using only the attached short
cord. If this cannot be done, then use a twisted-pair cable like the data
cable for the modem (i.e., NOT a flat phone cord) to connect the filter
to the wall jack.
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