FCCill: CDG-ARTU
MAGNASTAR EXHIBITC
C-2000 DIGITAL AIRBORNE TELEPHONE SYSTEM
1.2 EquipmentDescription
The MagnaStarC-2<XX>systemis designedwith the businessaircraft in mind. With two air-
groundvoice channeloperationsas a standardfeature,the C-2<XX>consistsof an Airborne Radio
Telecommunications Unit (ARTU), an antenna,a duplexer, a mounting tray for the ARTU, one or more
Cabin Data Bus Repeaters(COBRs), andoneto nine telephonehandsets. Optional equipmentincludesone
to three Analog Interface Units (AlU), a Call Alerter Switch (CAS), Cell PhoneInterface (CPI), Cockpit
HeadsetInterfacePanel(CHIP), andotherspecializeddevices.
A&JJ1: The ARTU provides the private automatic baseexchange(PABX) features,controls the C-2000
system.and containsthe receiver-transmitter functions for radio transmission. This digital radio hasbeen
implemented using state-of-the-art multiple digitaJ signal processor techniques to provide accurate
waveform control and noise-free, reliable communications in the noisy, fading. high-Doppler signal
environment seen in jet aircraft-to-ground communications. Reliability is further enhanced by the
automatedassemblyandtest techniquesusedto manufacturethe high density surface-mount-devicecircuit
cards. Should any problem occur, built-in-test identifies the sourceof the problem for quick circuit card
replacementandreturn of the unit to service.
Antenna/ D~lexer: The antennais a low drag,quarterwavelengthdesignswtablefor useon high
perforDJancejet aircraft. Theduplexeris apassivesignalfilter-combinerthatcombinesthereceiveand
transmitlinestothecommonantenna.
~: The dataandcontrol interfaceto the ARTU is by meansof ahigh speedtime division multiplexed
digital busoperatingasa local areanetwork (LAN). Userinterfacedevicessuchashandsets,fax machines,
modems,etc. connectto the system via this LAN. There are two different nx>delsof the CDBR. The
CDBR-l (~ell) provides for physical connection of up to two digital handsets(with their RJ-ll jacks
for the fax I modemconnections)to the LAN bus. The CDBR-2 (model 2) provides two analoginterface
connections, each of which can support either a four wire analog handsetor two wire data for direct
connection of a fax machine or modem Additionally, the CDBR-2 provides a separateinterface for
connectionof adigital handset.
Di2ital Handset: Thetelephonehandsetshavebeenselectedfor performanceandreliability. The handsets
contain noise-cancelingmicrophonesto overco~ the aircraft noise environment; audio is digitized at the
handsetto further ensureclear communication. Special function keys and a liquid crystal display allow
easy use of all options available to the user. The digital handsetsare offered with varied mounting
provisions to fit any installation requirement. Handsetsareoffered with a) a standardbuild-in style mount
to hold the handsetwhen not in use,with a ratcheting cord reel, b) that version with a bulkhead mounting
adapter,c) the handsetand cord reel without a mount, for custom mounting, and d) a "curly-cord" (like
standardoffice phones)with aplug for the ability to relocatethe handsetto various locationswired with the
matchingjack. Variations a - c also are available with the RJ-ll jack remoted from the handset,to be
locatedwhere it best fits in the interior design of the aircraft. All variations come in four colors: white,
platinum, pepperdust,andblack. Develop~nt is on-going for additional telephonehandsetoptions.
AllJ.: The AIU canbe usedto connectananalog SATCOM unit, a Cel1PhoneInterface(CPI), a HF radio,
or a Public Address(PA) amplifier, and/or other communications devicesto the MagnaStarsystem The
AIU bas been designed with electrical interfaces to optimize the connection to any analog-interface
SATCOM systemselectedby the custo~. Separateconnectionsareprovided to accotmtfor variations in
audio-line impedanceandlevel andin the hook switch and statusinterfacesbetweenSATCOM equip~nt.
HF radio connections can be made directly or through the aircraft audio control panel. The varying
requirementsfor the SATCOM and HF interfacesled to anAIU designthat offers the flexibility to connect
a wide variety of equip~nt andsystemsto the C-2000. AIUs interface to the ARTU over the LAN, like
theCOORs.
RevB
1-3
