Description

The M-949-01 Line Sense relay is a small PWBmount 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.

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,