Installing the DSL Splitter Near the DSL Modem/Router

In the diagrams on this page,
  • pair 1 (wht/blu) = "voice" connections for line one
  • pair 2 (wht/org) = "voice" connections for line two (if present)
  • pair 3 (wht/grn) = DSL data connections
  • pair 4 (wht/brn) = line connection from the NID to the splitter
Where possible, I would recommend actually using the pairs shown for the purposes indicated.  That should minimize the need for rewiring jacks to complete your DSL installation and will make it as simple as possible if it is necessary to remove DSL service in the future.

Where "DSL" appears on this page, it always refers to ADSL.

Need to buy a splitter? Get it here and help support this page. If you have a star topology, you have the option of placing your splitter near your DSL modem/router without a great deal of difficulty.  Some of us have a compulsive need to be able to unplug things.  If you fall in that category, this is the wiring arrangement for you!  For this type installation, you would use a splitter intended for indoor installation with modular jack connections.  The wiring required to locate the splitter near your DSL modem/router is not a great deal different that the wiring to place the splitter at the hub/junction point.  In fact the cable connections and cross-connects at the hub would be identical.

The three things are significantly different for this type installation:
  • The cable from your 66-block or other hub/junction device is much longer to run all the way to the jacks where the splitter will be located.
  • The splitter cable will terminate at jacks rather than connecting directly to the splitter.
  • Short modular patch cords will connect the DSL "LINE" from the jack to the splitter and the "VOICE/PHONE" side of the splitter to a jack that returns the phone line to the hub for distribution to the other jacks in the house.  The "indoor" or "desktop" splitter has a "DSL/MODEM" jack for DSL data that is connected directly to the modem/router.
Need to buy a splitter? Get it here and help support this page.

This arrangement allows you to easily do two things that you might find useful from time to time. 
Note: If you have an alarm system, even if you have a star topology, you may find it preferable to use a splitter near the NID, so that you don't have to reconfigure the connections to the RJ 31X jack.

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