Airborne Intercommunications System

The SP-1450/N-E Intercommunications System (ICS) completes the company’s line of defense communications products for applications onboard fixed-wing and rotary-wing aircraft. It has been designed to manage all radio communications and navigation equipment, data links, and internal/external communications facilities and to integrate their functionality into a single, Tempest proven, architecture.

The SP-1450/N-E ICS provides switching and routing functions to configure the platform’s internal and external communications resources and relevant access by the users to such facilities. These functions are supported by control, amplification, and interfacing for all the radio communications facilities installed on the platform and by flexible intercom facilities.

The digital design of the SP-1450/N-E ICS is modular, flexible, and based on an open architecture so that it can be configured to meet various requirements. Extensive use of fiber optics connections and appropriate wiring layouts are used to reduce crosstalk and EMI in order to satisfy all TEMPEST requirements.

The SP-1450/N-E ICS is configured into the following LRUs:

  • Communications Management Unit (CMU) SP-1451/N-E
  • Main Station Unit (MSU) SP-1452/N-E
  • Secondary Station Unit (SSU) SP-1453/N-E
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  • Key Features
  • Technical Specifications
  • TEMPEST performance compliant with AMSG 784B Volume I requirements
  • EMI performance compliant with MIL-STD-461 specifications
  • MIL-E-5400 requirements
  • Extended components/functions integration, to allow for weight and volume saving
  • Full system redundancy for critical functions
  • Analogue Back-up circuitry for three Main Users
  • Interface with different cryptos and LINK-11 DTS
  • Integrated Warning Tones Generation and management function Integrated Headset Interfaces (hi/lo impedance and/or stereo headset compatible)
  • Sunlight readable and NVG compatible operator panels
  • Hot-mic mode in intercom operation
  • Software oriented design for maximum flexibility and growth capability
  • Digital switching matrix for voice/data routing and distribution
  • Selection by the user of the desired communications channel(s)
  • Remote control of the system’s configuration by the aircraft computer over multi-bus interface (MILSTD-1553)
  • BITE capability with identification of the failure at LRU level
  • Modular construction
  • Use of fiber optics signal bus to avoid crosstalk
  • Audio Interference Bandwidth: 300 Hz to 2500 Hz


Audio Input (Adjustable)

  • Minimum level at 150 Ohm: 100 mVrms
  • Maximum level at 150 Ohm: 2.5 Vrms
  • Minimum level at 600 Ohm: 500 mVrms
  • Maximum level at 600 Ohm: 11 Vrms


Audio Output

  • Minimum level at 150 Ohm: 100 mVrms
  • Maximum level at 150 Ohm: 1.4 Vrms
  • Minimum level at 600 Ohm: 500 mVrms
  • Maximum level at 600 Ohm: 5 Vrms


Dimensions and Weight

  • SP-1451/N-E - CMU: 3/4 ATR - 9.5 Kg
  • SP-1452/N-E - MSU: 110 mm (W) x 95.2 mm (H) x 146 mm (L) -
    1.27 Kg
  • SP-1453/N-E - SSU: 91 mm (W) x 80 mm (H) x 151 mm (L) - 1 Kg
  • MTBF(as per MIL-HDK-217D):
    • CMU ≥ 1500 OH
    • MSU ≥ 6000 OH
    • SSU ≥ 12000 OH
  • MTTR: 20min


  • Earphone Output mono (nominal): At 150/600 Ω, power 250 mW +/- 10 %
  • Earphone Output stereo (nominal): At 300 Ω + 300 Ω; power 125 mW + 125 mW
  • Bus interfaces: MIL-STD-1553B ARINC-429
  • Primary power: +28 Vdc as per MIL-STD-704
  • Power consumption:
    • SP-1451/N-E - CMU 75 W
    • SP-1452/N-E - MSU 17 W
    • SP-1453/N-E - SSU 10 W
  • Operating temperature: -40°C to +71°C (Without forced air cooling)
  • Storage temperature: -55°C to +90°C
  • Relative humidity: Up to 95%
  • Altitude: Up to 70,000 ft
  • EMC: As per MIL-STD- 461/462
  • TEMPEST: As per AMSG 784B volume I

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