FutureSmart HBT-124P Telephone Distribution hub Installation Guide
4
Troubleshooting
No Dial Tone:
There are five possible causes.
1. The line is not connected between the demarcation point and the panel.
Connect the feed line from the demarcation point to the RJ45 jack on the module. Be sure you have wired each
side of the wire correctly using the 568A standard. Use the color code printed on the RJ45 jack when wiring the
jack.
2. One of the runs has a short between Tip and Ring. This could be a shorted pair in a crushed wire or a miswired
jack located anywhere in the house.
At the FutureSmart panel disconnect the jacks one at a time while monitoring the line for dial tone. To do this you
will need to unplug the jumper wires one at a time from the module. When dial tone is heard you have isolated the
problem to the last jack that was disconnected. To confirm that the jack is the problem, reconnect the wire to verify
that the dial tone is lost again when the run is being fed.
Rewire at the jack being careful to keep Tip and ring from shorting. Recheck for dial tone. If you still don’t have dial
tone then test the suspect jack run for continuity with a multi-meter.
Disconnect the feed line by unplugging the 6” jumper wire that feeds the signal from the incoming RJ45 port-to-port
#1 on the module. With the feed line disconnected, use the ohms setting on your multi-meter to check for a short
between Tip and Ring on the suspect pair. If the meter shows a short then there may be damage to the cable
feeding the jack. Disconnect the wire at the jack leaving the wires separated so that the pair you are testing is not
shorted. Back at the panel, test the line for continuity again. If the pair is still shorted then you will either have to pull
a new cable or use a different wire pair to feed the line. Check other pairs using the trouble shooting methods
previously discussed.
3. Ring is shorted to ground on one of the runs.
Disconnect the jack by pulling jumper from the distribution module. Use the ohms setting on your multi-meter to
check for a short between Ring and earth ground on the suspect pair of the jumper end you disconnected. If the
meter shows a short then there may be damage to the cable feeding the jack.
Disconnect the wire at the jack leaving the wires separated so that the pair you are testing is not shorted. Back
at the panel, test the line for continuity again. If the ground is still present then you will either have to pull a new
cable or use a different wire pair to feed the line. Check other pairs using the same procedure.
4. The line is not active from the Telephone Company.
Disconnect the house lines at the entry point on the outside of the home and check for dial tone. If no dial tone is
present you will need to call the Phone Company for service. If you have dial tone at the entry point then reconnect
the house lines and refer to trouble shooting methods described above.
5. The shorting block for the pair in question is loose or not installed.
Check the back side of the module to make certain that the 25 pair Telco connectors both have a small PC based
surge protection board plugged into them and that the ground wires are connected to a good earth ground.
Crosstalk:
You can hear bleed over noise from other phone lines that are in use. This is usually caused by a miswired jack or
another connection problem. Use the troubleshooting methods described under the Static heading above to isolate
where the cross talk is being introduced.
