December 2006
Blue Sky Network
100115
C-1000A Iridium™ Satellite Phone System
Page
15
Modem Unit (MU) Installation
The location of the C-1000A Modem Unit is at the option of the installer, but
consideration should be given to environmental conditions, distance from the
antenna and distance from the C-1000A Cabin Unit. The Motorola transceiver’s
operating specifications are limited to –20ºC to +60ºC.
Power Input
Either of two input connections can be used:
•
28 VDC nominal, 1 amp max at 27.5VDC (Input Range: 18 - 32 VDC)
•
12 VDC nominal, 1.5 amps max at 12VDC (Input Range: 10 - 15 VDC)
A single 3-amp circuit breaker is recommended to protect the aircraft power
distribution system.
2-Wire Analog POTS Telephone Interface
The C-1000A Modem Unit supports a standard 2-wire tip and ring loop (phone line).
See DB-37 “Cabin Unit” Connector pins 14 & 15
. The RJ-11 connector on the C-
1000A Cabin Unit is wired to this circuit. This circuit enables the C-1000A Modem
Unit to interface to one or more 2-wire Plain Old Telephone Service (POTS) phones
that can be located around the aircraft. This includes 900MHz & 2.4GHz cordless
phones for even greater installation flexibility. If more than one POTS phone is
connected, all POTS phones can talk on the call, just as with residential extension
phones. You cannot join a POTS (analog) phone conversation using the Motorola
Digital Handset. The Motorola transceiver does not support simultaneous digital and
analog outputs.
Loop Battery Voltage .............................. -49 VDC Typical
Loop Resistance, Including Telephone .. 1000 Ohms Maximum
DC Loop Current .................................... 25 mA Typical
Ringing Signal ........................................ 20 Hz, Trapezoidal Waveform
Ring Voltage ........................................... 65 Volt, 3 REN
Signaling................................................. Loop Start, DTMF (Dial Pulses Ignored)
AC Impedance........................................ 600 Ohms
Audio Band Pass .................................... 300 Hz to 3400 Hz
4-Wire E&M Analog Telephone/Audio Circuit Interface
The C-1000A Modem Unit provides an interface to a standard 4-wire E&M audio
circuit. Transmit audio originating at the user’s microphone or handset is applied to
the TX Input to the Modem Unit, while the Modem Unit’s RX Output delivers received
audio toward the user’s earpiece or handset. (The user must provide the appropriate
interface equipment between the user’s headset or handset and the Modem Unit.)
The Modem Unit’s audio output level is approximately 0 dBm maximum; the input
level to the Modem Unit should be similar. DTMF signaling is supported; dial pulse
signaling is not supported.
A call is originated or answered by applying a voltage of either polarity across the
optically isolated Hook Switch Inputs (P1-4 & P1-5 on the “
Power” connector
);
removing the applied voltage ends the call. The Modem Unit indicates an incoming
call by operating the Incoming Ring Indicator relay; isolated contacts provide a
normally closed (P1-8 on the “
Power” connector
) or normally open (P1-9 on the
Summary of Contents for Iridium C-1000A
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