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PRODUCT - Technical Support
- What is the procedure
for bringing a STU online?
- Install the STU into your alarm panel or on the wall.
- Set the dip switches to a 4-digit account code between 0001 and EFFF.
- Run 12vdc power to the STU from your alarm panel. The red LED should now blink.
- Run a wire from the RJ31X demarcation block to either RJ31 jack on the STU.
- Run a wire from your alarm panel phone line input to the other RJ31 jack on the STU.
- Wire up to 2 supervised dry contacts to the STU. Place the 2.2K EOL resistor across the
dry contacts.
- Call your monitoring station and have them issue an “Up STU” command.
- What
are the most common reasons why a STU is “Not Responding”?
- The phone line has not been cross-connected to the scanning equipment at the Telephone
Company. This can be verified by listening with a phone set on the line. When the
monitoring station issues an “Up STU” command and no “chirps” of data
are heard on the line, this is the problem.
- The power from the alarm panel that is used to run the STU is not regulated and/or has
AC ripple.
- The STU had lost power at some point and then power was restored. This can be rectified
by an “Up STU” command from the monitoring station.
- Open or faulty wiring between the RJ31X and the STU.
- Long telephone loop or noisy telephone loop. The total resistance of the premise
equipment and the telephone line must be less than 1500 ohms.
- What
are the most common reasons why a STU chirps off hook when the customer is using the
phone?
- The “Off Hook Polling” feature has been enabled at the monitoring station.
Change this option in the receiver to alleviate this problem.
- The STU is on a phone line that is connected to a Digital Loop Carrier system. This
digital transport will not pass all of the signals transmitted by the STU, thus causing
chirps. The Telephone Company should be able to verify if this is the reason for your
chirps.
- Incompatible telephone equipment. The telephone set does not attenuate the signal
required for off hook recognition.
- There
is a echo/motor boating sound on the phone since the STU was put on the line. Is there
anything that can be done to alleviate this noise?
- Cut jumper JP1 (located next to the transformer in the corner of the board). This should
lessen the echo.
- Turn down the volume/amplification of the phone set. This will also lessen the echo.
- Is the STU UL approved?
- The STU-2Z-UL, which comes in it’s own enclosure, is UL approved. The STU must have
Off Hook Polling enabled to comply with the UL requirements.
- What is the power
consumption of a 2Z STU?
Email DCX for more product information, or for your local telephone company representative.
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