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Viking LDB-3 Technical Practice
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Viking LDB-3 Technical Practice

Advanced ring/ loop detector
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TECHNICAL
TECHNICAL
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mode which allows the relay to follow ringing or to remain activated during the off time of stan-
dard ring cadence.
The LDB-3 comes complete with a 12 VDC power adapter, and can also provide switched
12VDC .35 Amp output to power
external lights, etc. during ringing
and/or off-hook conditions.
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• Detects ring voltage and off hook loop current
• On/off switches for ring detection and off-
hook/loop detection
• Screw terminal connections
• Selectable ring cadence mode (relay can remain
on between rings)
• Wall mountable with foam tape (included) or
screws (not included)
• Switched 12V DC output (follows relay activation
for powering strobe lights, cameras, etc.)
• One set of (NO) normally open or (NC) normally
closed relay contacts provided
• Disable input, ideal for use with two-button
emergency phones (E-1600-20A), will not
activate relay on "Info" calls, see DOD# 215 for
more information on the E-1600-20A
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Provide a Contact Closure
During Ringing and/or Off-Hook
Ideal for Use with Two-Button Emergency Phones!
The LDB-3 Advanced Loop Detector monitors an analog phone line
for ringing and/or an off hook condition. A built-in relay can be acti-
vated when either of these conditions are detected. This is ideal for
monitoring line status or for providing a visual indication of such.
The LDB-3's disable input is ideal for two-button emergency phones,
such as Viking's E-1600-20A, allowing "Info" button calls to be
placed without activating the relay (turning on the emergency strobe
light, camera, etc.)
Three DIP switches are provided for turning ring detection on or off,
off-hook/loop detection on or off and for selecting a ring cadence
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• Control a strobe or beacon light for ring indication
• Provide relay closures on ring and off-hook
• Trigger a security camera
• Trigger a tape recorder
• Phone "In Use" indicator
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Power: 120V AC to 12V DC adapter provided
Dimensions: 74mm x 53mm x 25mm (2.9" x 2.1" x 1.0")
Shipping Weight: 0.4 kg (0.86 lbs)
Environmental: -26° C to 54° C (-15° F to 130° F) with 5% to
95% non-condensing humidity
Relay Contact Rating: .5A @ 125V AC/1A @ 30V DC
Maximum Current Draw Auxiliary 12V DC Output: 350mA
Minimum Loop Current: 15 mA
Disable/Info Switch Input: 50mA/80mW maximum
Ringer Equivalence: 0.5 A REN
Connections: 2 position and 11 position screw terminal blocks
LDB-3
LDB-3
Advanced Ring/
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Loop Detector
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March 9, 2012
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Summary of Contents for Viking LDB-3

  • Page 1 The LDB-3 comes complete with a 12 VDC power adapter, and can also provide switched 12VDC .35 Amp output to power external lights, etc.
  • Page 2 Holes B. Using the Included Tape Step 1. Clean the back of the LDB-3 and the surface you are mounting to with rubbing alcohol before mounting. Step 2. Remove the backing on one side of the tape and adhere to the LDB-3. Remove (2) #6 Flathead the rest of the backing and press unit firmly to surface you are mounting to.
  • Page 3 Connect the incoming line to terminal block positions 1 and 2 as shown in the diagram. No terminal device (phone) is required. In this manner, the LDB-3 can mon- (+) Black itor for ringing any place along the ringing line.
  • Page 4 DIP switches for easy on-site programming. Due to the dynamic nature of the product design, the information contained in this document is subject to change without notice. Viking Electronics, and its affiliates and/or subsidiaries assume no responsibility for errors and omissions contained in this information.