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M-949-01

Description
Line Sense Relay
File Size207KB,3 Pages
ManufacturerCLARE
Websitehttp://www.clare.com
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M-949-01 Overview

Line Sense Relay

M-949-01
Line Sense Relay
Features
Senses telephone line current from 18 to 125mA
Includes 1 Form A relay contact
Maximum closure time 1 ms including bounce
Achives 63 dB minimum longitudinal balance
Provides 1500 VDC coil-to-contact isolation
Improved RFI shielding
UL Recognized
Applications include: central office products, PBX
and key systems, rotary dial monitoring devices,
Description
The M-949-01 Line Sense relay is a small PWB-
mount loop current detector with the safety and
reliability features required for FCC Part 68 regulated
telephone applicatoins. When connected to the voice
pair (Tip and Ring of an ordinary telephone line, the
M-949-01 provides a 1 Form A relay closure in
response to current above 20mA flowing hrough the
wires. This closure can be used by control circuitry for
on-hook’off-hook monitoring, switchhook flash
detection, and rotary dial pulse counting. Simple in
design and rugged in construction, the M-949-01 is
ideally suited for use with the Teltone M-959, M-8870,
M-8880, M-8888, and other loop current controlled
telephone dialing recievers.
Figure 1 Electrical Configuration
Ordering Information
Part #
M-949-11
Description
Line Sense Relay
Figure 2 Typical Application: Dialed Digit Monitor
DS-M-949-01-R1.0
www.clare.com
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