Secure Communication System 3.0 Compact Digital

A secure modular aircraft audio management and communication system that features scalable integration of multilevel secure voice/data/video communications. An advanced modular communications solution for the information-based, net-centric battlespace


3D Spatial Audio





The Palomar SCS 3.0 Secure Digital Communication System and aircraft audio management system features an advanced set of modular building blocks that meet the most stringent military requirements of 21st-century information-based warfare. The solution’s native scalability supports integration of communication systems for a wide range of platforms, from compact aircraft to large secure ISR aircraft, to sizable multilevel secure, battle-ready tactical installations. Palomar has combined its proven expertise and core technologies in TDM switching, IP and TEMPEST with standards based and COTS architectures in a modern, highly flexible and upgradable design for today’s multi-mission platforms and deployments. Our systems have unmatched flexibility, from automated multiband relay of voice/data/video to radio, crypto, modem and sensor control to dynamic, multilevel secure communications management. This flexibility makes mission reconfigurations more efficient through a user-friendly configuration manager, reducing typical modification costs and timelines. An uncompromising combination of reliability, modularity, upgradability and interoperability makes the Palomar SCS 3.0 Secure Digital Audio Management and Communication System the solution of choice for all multi-mission platforms in the 21st century.

SCS 3.0 Scalable Architecture

Features and Benefits

Dependable Technology

Reduced size, weight and power
Simultaneous clear and secure operation
Digital voice, data and video management
Multilevel secure Voice over Internet Protocol (VoIP)
Complete management of communication assets and user configurations
Easy customization due to modern modular design
Radio and crypto relay
Intercom conferencing
Wideband audio (optional)
Binaural audio (spatial optional)
Redundancy and emergency operations
Extensive BIT capabilities
Radio-priority configurable for each position
Conduction-cooled sealed enclosures

Compatibility and Interfaces

Standard interfaces: MIL-STD-1553 and Ethernet
Compatible with all standard headsets and microphones
NVIS compatible and daylight readable

Certified Tough & Secure

DO-178B and DO-254 certifiable

Notable Platform Installations

C-130J Block 8.1 including variants AC, EC & MC

More Information

Radio receive levels
Software selectable 0.1 Vrms to 15.8 Vrms and 150 Ω,
600 Ω, and >4K Ω

Radio transmit levels
Software selectable from 0.1 Vrms to 2.0 Vrms

Microphone inputs
Low-level dynamic, high-level amplified

Headphone outputs
Binaural and monaural, standard and ANR high level
(300 Ω cups) and low level
(19 Ω cups)

Frequency response
Up to 20 Hz – 20 KHz

Speech intelligibility
91 percent at peak noise

Crosstalk isolation
Red/black separation greater than 100 dB at 1 KHz

Audio and data latency
Audio: <3 milliseconds
Data: Ethernet QoS settings and load dependent

Audio quality
Distortion <3 percent, idle channel noise -56 dBr

Programmable luminosity curves

28 V per MIL-STD-704

Designed to RTCA/DO-160F, MIL-STD-810G

MIL-STD-461F and RTCA /
DO-160F, MIL-STD-464 and
RTCA / DO-160F

NSTISSAM 1-92 Level 1

Software design assurance
RTCA/DO-178B Level C

Hardware design assurance
RTCA/DO-254 Level C

Operation standards

Quality assurance and best practices
SAE AS9100, ISO 9001 and AS9115

The DSU manages all connections among communications and data assets, crew members and operatives. The DSU is a modular, secure, TEMPEST qualified communications interface and control unit for all internal and external, secure and non-secure voice and data streams and ports.

    • Best of non-blocking TDM and IP buses combined in one unit
    • High-speed TDM architecture with very low deterministic latency for high-quality service and audio
    • Architecture optimized for high bandwidth and universal interface
    • Software defined configuration manager to quickly and efficiently add, delete, modify or simply manage mission and communications plans
    • Quick, low-cost upgrades and modifications with a modular, open cPCI 3U backplane, expandable with software updates or future Palomar and COTS cards
    • T1, Ethernet and MIL-STD-1553B ports

Short Digital Switching Unit 

A Compact solution for SWaP restricted platforms, while still providing end users with Palomar’s industry leading secure communication system.


    • 12 transmit
    • 12 receive
    • 12 crew positions

Tall Digital Switching Unit  

Palomar’s standard switch for SCS 3.0.  To increase capability, a second switch can be added to the architecture via Ethernet to support larger system requirements.


    • 18 transmit
    • 18 receive
    • 18 crew positions

Dual Switch Capability:

    • 36 transmit
    • 36 receive
    • 32 crew positions

The SCS 3.0 system features our new DCU architecture, allowing standard unit circuitry to operate with a wide range of panels without hardware or application software modifications.


  • Minimum cost to change or redesign front panel quickly
  • Generic programmable architecture with a universal connector
  • Flexible backplane with all key functionality and a programmable panel interface
  • Software only control panel available for existing computer screens and multi-function modules. There is no need for extra space and wiring for special applications
  • Binaural audio with support for ANR and dual headsets per position

FD-DCUs provide flight crew members access to in-flight conference networks, radio channels, guard channels, NAVAIDs and other voice and data assets in the aircraft.


  • Separate volume controls for each channel plus master volume control
  • LED or screen based indicators for activity and transmit/receive modes
  • Multilevel secure operation
  • Emergency communication access to other control modules
  • Direct connection to selected radios and NAVAIDs in stand-alone and emergency backup modes
  • Controls for radio and intercom channel selection, receive/transmit, stereo balance, VOX sensitivity, AGC, HOTMIC, security level and more

C-DCUs provide the same functionality as FD-DCUs but have panels that meet the needs of mission area crew members. They can also add optional human interface elements like display screens and specialized control modes.


  • Controls for radio and intercom channel selection, receive/transmit, volume, VOX, AGC, HOTMIC, security level, playback and more
  • Access to other control modules in emergency mode
Palomar Secure Communications