SP - 1450/N - E AIRBORNE INTERCOMMUNICATIONS SYSTEM

sp - 1450/n - e(airborne intercommunications system)SP - 1450/N - EAIRBORNEINTERCOMMUNICATIONSSYSTEMDESCRIPTIONThe SP-1450/N-E Intercommunications System (ICS)ideally completes the SELEX Elsag line of defencecommunications products for applications onboardfixed-wing / rotary-wing aircraft: it is madeto manage all the radio communications and radionavigation equipment, data links and internal / externalcommunications facilities and to integrate their functionalityinto a single, Tempest proven, architecture.The SP-1450/N-E ICS provides switching and routingfunctions to configure the both platform’s internal andexternal communications resources and relevant accessby the users to such facilities.These functions are supported by control, amplificationand interfacing for all the radio communications facilitiesinstalled on the platform and by flexible intercom facilities.The SP-1450/N-E ICS is currently installed onboardNH-90 and EH-101 helicopters of several NATO countries.The design of the SP-1450/N-E ICS is modular, flexibleand based on a digital design and an open architecture,so that it can be configured to meet various user’srequirements. Extensive use of fibre optics connectionsand appropriate wiring layouts are used to reducecrosstalk and EMI, in order to satisfy all TEMPESTrequirements.The SP-1450/N-E ICS is configured into the followingcomponent LRUs:• Communications Management Unit (CMU)SP-1451/N-E• Main Station Unit (MSU)SP-1452/N-E• Secondary Station Unit (SSU)SP-1453/N-EThe simplified block diagram shows the relationshipbetween the Communications Management Unitthe other components of the ICS and the onboardcommunications resources (radios, modems, cryptos)CMUThe Communications Management Unit - that includesthe WTG/DVO (=Warning Tone Generator/Direct VoiceOutput Unit - is a digital switching matrix which, undercontrol by the MIL-STD-1553 Bus (or STANAG 3838) ofthe aircraft, configures the communications resources byimplementing the following functions:• Control of the operating parameters of the radios,cryptos and modems• Routing of crypto and modems through externalcommunications equipment

• HF to V/UHF and V/UHF to HF relay, i.e.retransmission over the V/UHF channel of informationreceived over the HF channel and viceversa• Public Address function by using of external audioamplifier• Management and routing of Navigation Aids, alarmsand alert signals• External interfaces number growth up capability byembedded board populationThe audio signals to/from the communications equipmentconnected to the CMU is digitised, formatted and routedto the MSU and SSU over a high speed optical busMSUEach Main Station Unit allows the Main crew members(pilots and mission operators) to control the assigned onboard audio sources (Radio transceivers,NAVAIDS/SONAR/ESM, etc.) and to interface their ownheadset with the desired audio channels.SSUThe Secondary Station Unit allows the Secondary crewmembers (gunner, loading ramp operator, ground servicepersonnel) to be a user of the assigned audio set, so toreceive external communications channels or to accessthe intercom facilities.The Communications Management Unit is capable ofsupporting up to 10 Main Station Units and 5 SecondaryStation Units, to interface and control up to:• 20 T/R radio channels (HF and V/UHF TransceiverUnits)• 8 Crypto Equipment (Narrow band and/or Wideband)• 25 Audio Nav, warning and alarm inputs• 5 Audio stereo outputs• 1 LINK-11 DTS• Embedded ambient Noise suppressor featureDifferent System configurations are available for aircraftof different types, all using common units and modules.System designed by SELEX Elsag in cooperation withBecker for MSU and SSUMAIN FEATURES• TEMPEST performance compliant with AMSG 784BVolume I requirements• EMI performance compliant with MIL-STD-461specifications• MIL-E-5400 requirements• Extended components / functions integration,to allow for weigh 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 managementfunction• Integrated Headset Interfaces (hi/lo impedanceand/or stereo headset compatible)• Sunlight readable and NVG compatible operator panels• Hot-mic mode in intercom operation• Software oriented design for maximum flexibility andgrowth capability• Digital switching matrix for voice/data routing anddistribution• Selection by the user of the desired communicationschannel(s)• Remote control of the system’s configuration by theaircraft computer over multi-bus interface(MIL-STD-1553)• BITE capability with identification of the failure at LRUlevel• Modular construction• Use of fibre optics signal bus to avoid crosstalk

TECHNICAL SPECIFICATIONSGENERALAudio InterfaceBandwidth: 300Hz to 3500HzAudio Input (adjustable):Minimum level at 150 Ohm: 100 mVrmsmaximum level at 150 Ohm: 2.5 VrmsMinimum level at 600 Ohm: 500 mVrmsmaximum level at 600 Ohm: 11 VrmsAudio Output:Minimum level at 150 Ohm: 100 mVrmsmaximum level at 150 Ohm: 1.4 VrmsMinimum level at 600 Ohm: 500 mVrmsmaximum level at 600 Ohm: 5 VrmsHeadset Earphone Output mono: Nominal output: At 150/600 W, power 250 mW +/- 10 %.Earphone Output stereo: Nominal output: At 300 W + 300 W;power 125 mW + 125 mWBus interfacesMIL-STD-1553BARINC-429 (Provision for)Primary powerPower consumption+28Vdc as per MIL-STD-704SP-1451/N-E - CMU 75WSP-1452/N-E - MSU 17WSP-1453/N-E - SSU 10WOperating temperatureStorage temperature-40°C to +71°C (Without forced air cooling)-55°C to +90°CRelative humidity Up to 95%AltitudeUp to 70,000 ftEMC As per MIL-STD- 461/462TEMPESTDimensions and weightsAs per AMSG 784B volume ISP-1451/N-E - CMU - 3/4 ATR - 9.5 KgSP-1452/N-E - MSU - 110mm(W)x95.2mm(H)x146mm(L) - 1.27KgSP-1453/N-E - SSU - 91mm(W)x80mm(H)x151mm(L) - 1KgMTBF(as per MIL-HDK-217D)CMU ≥ 1500 OHMSU ≥ 6000 OHSSU ≥ 12000 OHMTTR20min.SELEX Elsag S.p.A.Sales Department - Point of Contact: getinfo@selexelsag.com - www.selexelsag.comThis publication is issued to provide outline information only which (unless agreed by SELEXElsag S.p.A. in writing) may not be used, applied or reproduced for any purpose orform part of any order or contract or be regarded as a representation relating to theproducts or services concerned. SELEX Elsag S.p.A. reserves the right to alterwithout notice the specification, design or conditions of supply of any product or service.© SELEX Elsag S.p.A. All Rights reservedCODE: e-A-SC-011 /V1/11/Z