Viking ldb-1 Service Manual

Telecom Solutions for the 21st Century

Technical Practice

LDB-1

Loop Detect Board

November 24, 1999

Loop Detector Board with on board

12 Volt Regulator

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.

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.

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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)

Optional PS-2 Power Supply

(not included)

Note: If dry contacts
are required, do not
use PS-2.

Incoming

Phone line

Telecom

Device

Specifications

Installation

Installation Diagram

1 2 3 4 5 6 7

T
R

T
R

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

N.O. dry contacts

+

-

- or -

12V DC Output

Schematic Diagram

+12V DC
COM

1 2 3 4 5 6 7

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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.

Printed in the U.S.A. ZF301230 Rev AFax Back Doc # 406