950 / 977 Intercom System

IM-950 / IM-977

The System 950 / 977 is the most advanced all-wired emergency vehicle communications system available today. It was developed and designed specifically for firefighters.

The System 977 has all the System 950 features, but with additional ruggedness. All connections are waterproof, and its enclosure is fully weatherproof.


Basic Features

The modular system accommodates up to:

  • 3 radios

  • 10 firefighters

  • 14 positions including 4 radio-transmit positions

The system provides full-duplex intercom among all crewmembers and radio push-to-talk capability from four positions.

Sophisticated electronics ensure that only the keying operator’s voice transmits over the radio. When a crewmember keys the radio, all other microphones are locked out of the transmit circuit. Intercom communication between other positions remains active during radio transmission.

Plug-and-play components and the fewest components of any leading system make the System 950 easy to install, saving time and money.

Repairable parts reduce lifetime ownership cost and allow fast repair turnaround to minimize downtime.


Advanced Features

Entertainment Audio Mute
Automatically mutes connected third-party audio devices during incoming radio calls so radio transmissions are always heard clearly.

Advanced Electrical Noise Elimination
Designed to counter electrical noise produced by public safety vehicle systems, ensuring clean audio quality.

Rugged Components
Premium-grade components built for fire-service durability.

Watertight Interconnect Cables
Quarter-turn twist-lock connectors, gold-plated contacts, and O-ring seals — no soldering or crimping needed.

RF & EM Shielding
Shielded microphone lines and overall cable shielding prevent interference.


Alternative Options

  • All-wireless headset option: LiberatorMAX

  • Hybrid wired/wireless option: 950MAX


Common Public Safety Applications

  • Pumper / Engine

  • Wildland / Brush Truck

  • Incident Command

  • EMS / Ambulance

  • Fire Boat

  • Aerial Trucks

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What is the warranty?
We offer a 2-year warranty from the date of purchase.
Does this system allow for wireless headsets?
For systems requiring wireless headsets, we recommend the 900MAX system.

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