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DC
Signaling Devices
Clare DC signaling
devices address telephony hook switch monitoring and rotary dial
pulse counting while addressing regulatory needs. The line sensing
relay devices are ideally suited to work the Dial Pulse Counter
Hook Switch Monitor Device (M-959) as well as other Tone products
offered by Clare such as the M-8870 DTMF Receiver.
M-949-01
Line Sense Relay
- Senses telephone
line current from 18 to 125 mA
- Used by control
circuitry for on-hook/off-hook monitoring, switch hook flash detection
and rotary dial pulse
- Provides
1500Vdc coil-to-contact isolation
- Includes
1 Form A relay contact
- Applications
Include: central office products, PBX and key systems, rotary
dial monitoring devices
Block Diagram
M-949-11
Balanced Dual Coil Telephone Line Current Sensing Relay
- Senses telephone
line current from 15 to 200mA
- Used by control
circuitry for on-hook/off-hook monitoring, switch hook flash detection
and rotary dial pulse
- Meets high
isolation voltage requirement of 4000V
- Meets UL
and British Standard specifications
- Includes
1 Form A relay contact
AN-142: M-949 - Loop Current Sensing and Ring Chatter
Block Diagram
M-959
Dial Pulse Counter and Hook Status Monitor
- Independent
hook status monitoring
- Time-guarded
dial pulse counting
- 10 or 20
PPS dialing speeds pin selectable
- Valid data
output strobe
Block Diagram
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