If you have a star topology,
installing DSL should be very easy if you place your splitter at the same location as your hub/junction.
If you are using a 66| block or some other hub device which allows easy reconfiguration of connections
and your cables are CAT3 or higher, you may be able to complete your installation in just a few minutes.
Ideally, you should be able to complete your installation by simply connecting the splitter to your junction device, changing
the cross-connects, changing the jack at a location suitable for your DSL modem/router where where you already have a CAT3
cable connected to the hub/junction, and changing the connection in the NID.
If your junction device is a bus-strip with screw terminals or some other device that doesn't allow for easy reconfiguration
of connections, this may be the perfect time to switch to a more suitable device.
Note: If you have an alarm system, special factors need to be considered while planning for your
DSL splitter installation.
Even if you have a star topology, you may find it preferable to use a splitter located near the NID,
so that you only need to make minor changes to the connections to the RJ
Refer to "Installing A DSL Splitter With An Alarm System".
View a photo
of an actual 66 block
configured as shown
"Wiring Block Techniques and Tips".
At the right is an illustration of an example 66-block arranged for a DSL installation. The exact arrangement of your block
would vary according to your particular installation, but would be similar to this example. Here are the connections shown on
- The cable coming from the NID is terminated on binding post pairs 1-4
- Pair 1 is unused. (Would have been line one before DSL was installed.)
- Pair 2 is line 2 (if present).
- Pair 3 is unused.
- Pair 4 is the DSL line - by using pair 4 for the DSL line, you can keep your phone line working while you install the splitter by
leaving pair 1 connected from the NID to the station cables until you're ready to cutover to the splitter. When you're ready to
cutover, you'd just change from pair 1 to pair 4 in the NID and change the cross-connects for line 1 on the block.
- The cable to the splitter is terminated on the opposite side of the block on binding post pairs 26-29. I chose this location
because it was easy to draw. You could terminate the splitter cable on the next four pairs available on your block. You could
choose pairs 45-49 at the end of the block and leave space to add more station cables consecutive to your existing cables. If
you're installing a new 66-block, you would probably terminate the splitter cable on pairs 5-8. There's no right or wrong
choice. It's just a matter of preference. Just remember to document what you do so that you can work on it in the future
without having to figure out what is where.
- The DSL line is cross-connected from pair 4 of the NID cable to pair 4 of the splitter cable. This pair would terminate on the
"LINE" connection on the splitter.
- Pair 3 of the splitter cable would terminate on the "DSL" or "DATA" connection on the splitter. On the 66-block, pair 3 is
cross-connected to the cable going to the location where the DSL modem/router will be located.
- Pair 1 of the splitter cable would terminate on the "VOICE" connection on the splitter. On the 66-block, pair 1 is
cross-connected to the first pair of all the station cables to connect telephone line 1.
- If you have two telephone lines and want the DSL line to be on "line two", use pair 2 for the "VOICE" connections instead of pair 1.
- In the illustration, the cable on pairs 5-8 is used for the location for the DSL modem/router.
- Pairs 1 and 2 would go to a jack for connection of a telephone.
- Pair 3 would go to a jack for connection to the DSL modem/router.
(A dual jack faceplate could be used so that both jacks fit in the existing space.)
- Pair 1 of all the station cables are all cross-connected to the "VOICE" on pair 1 of the splitter cable. Pair 2 of all the
station cables are all cross-connected to pair 2 of the cable coming from the NID to provide connection to a second phone line.
If your DSL line is "line two", this would be adjusted accordingly. I would recommend installing the cross-connect for the
second line even if you only have one line. This will make it simpler and avoid confusion if a second line is added in the future.