M-949-01

M-949-01 Datasheet

M-949-01

Part	Datasheet
M-949-01	M-949-01 (pdf)

Related Parts	Information
M-949-11	M-949-11

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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, Figure 1 Electrical Configuration M-949-01 Line Sense Relay 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. Ordering Information Part # M-949-11 Description Line Sense Relay Figure 2 Typical Application Dialed Digit Monitor DS-M-949-01-R1.0 M-949-01 Absolute Maximum Ratings* Tolerance Inches Metric Max Min typ. typ. ref. ref. typ. ref. Absolute Maximum Ratings are stress ratings. Stresses in excess of these ratings can cause permanent damage to the device. Functional operation of the device at conditions beyond those indicated in the operational sections of this data sheet is not implied. Specifications Parameter Dual Coils Pick Up Current Drop Out Current Coil Current Coil Resistance Coil Inductance Longitudinal Balance Excitation to Closure Time Including Bounce Excitation Removal to Open Time Relay Contact Voltage Rating Current Rating Power Resistive Rating Rated Life Dielectric Strength Open Contacts Coil to Coil Coil to Contact Ambient Operating Temperature Non-operating

PDF Datasheet Preview

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,

Figure 1 Electrical Configuration

M-949-01

Line Sense Relay

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.
Ordering Information

Part # M-949-11

Description Line Sense Relay

Figure 2 Typical Application Dialed Digit Monitor

DS-M-949-01-R1.0

M-949-01

Absolute Maximum Ratings*

Tolerance

Inches

Metric

Max Min
typ.
typ.
ref.
ref.
typ.
ref.

Absolute Maximum Ratings are stress ratings. Stresses in excess of these ratings can cause permanent damage to the device. Functional operation of the device at conditions beyond those indicated in the operational sections of this data sheet is not implied.

Specifications

Parameter

Dual Coils

Pick Up Current

Drop Out Current

Coil Current

Coil Resistance

Coil Inductance

Longitudinal Balance

Excitation to Closure Time Including Bounce

Excitation Removal to Open Time

Relay Contact

Voltage Rating

Current Rating

Power Resistive Rating

Rated Life

Dielectric Strength Open Contacts

Coil to Coil

Coil to Contact

Ambient

Operating

Temperature

Non-operating

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Datasheet ID: M-949-01 523327