Viking LDB-1 Instructions for use

The LDB-1 provides a loop activated contact closure
when used in series with telecom devices on analog
phone lines. The LDB-1 will initiate a dry relay contact
on any off-hook condition. Alternatively, add the optional
PS-2 power supply to provide switched DC power.
Loop Detector Board with on board
12 Volt Regulator
VIKING©
Technical Practice
Telecom Solutions for the 21st Century LDB-1
Loop Detect Board
November 24, 1999
Dimensions: 47.6mm x 30.5mm (1.875” x 1.2”)
Mounting: (2) #4 screws (not included) or foam tape (included)
Shipping Weight: .45 kg (1 lb)
Added Loop Resistance: 40 ohms
Maximum Loop Current: 125 mA
Minimum Loop Current: 18 mA
Operating Temperature: -26°to 54°C (-15°to 130°F)
Installation
Installation Diagram
Printed in the U.S.A. ZF301230 Rev AFax Back Doc # 406
Due to the dynamic nature of the product design, the information contained in this document is subject to change without notice. Viking
Electronics, its affiliates and/or subsidiaries assume no responsibility for errors and/or omissions contained in this information. Revisions of this
document or new editions of it may be issued to incorporate such changes.
Product Support Line...[phone] Fax Back Line...[phone]
Incoming
Phone line
Telecom
Device
N.O. dry contacts
+
-
Note: If dry contacts
are required, do not
use PS-2.
The relay itself is phone line powered and does not need an
external power supply. Because both TIP and RING currents flow
through the relay, excellent line balance is maintained.
Specifications
Maximum Supply Voltage Input: 35 VDC
Maximum 12V Supply Current: 500 mA with PS-2
Longitudinal Balance: 63 dB minimum
Maximum Contact Voltage: 200 VDC
Maximum Contact Current: 500 mA
Maximum Contact Power: 10 W
Connections: 7 pin screw terminal block
12V DC Output
- or -
Optional PS-2 Power Supply
(not included)
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Sales...[phone]
Schematic Diagram
+12V DC
COM
T
R
T
R
1 2 3 4 5 6 7
1 2 3 4 5 6 7