|
PRODUCT - Technical Support
- What is the procedure
for bringing a STU online?
- Install the STU into your alarm panel or on the wall.
- Program a prom with a 4-digit account code between 0001 and EFFF, and the associated
zone information.
- If you are using AC, run your AC wiring through conduit to an AC outlet in accordance
with NFPA 70 1990 wiring practices. Set the STU jumpers for AC and 6vdc battery. After
applying power, the Red LED should flash.
- Connect the tip/ring wires to the terminal strip of the STU.
- Wire up all zones to the STU. For supervised zones, connect your dry contacts between
the alarm zone input on the STU and ground. Also set the supervised jumper JP3 to 1-2.
Place the 22K 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.
- Is the STU UL approved?
- The STU-11Z is UL approved. The STU must have Off Hook Polling enabled to comply with
the UL requirements.
- What is the power
consumption of a 11 Z STU?
Email DCX for more product information, or for your local telephone company representative.
|
