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Iridium Satellite LLC
9522A L-Band Transceiver Product Information Guide
V1.1 032405
4.0 Electrical Interfaces
The subsections to follow contain interface information for the electrical interfaces of the 9522A LBT.
4.1 DC Power Interface
4.1.1 DC Power Interface Signal Descriptions
The DC power interface is comprised of the DC power inputs and a control signal as summarized in Table
4 below. The EXT_PWR and GND inputs are used to supply DC power to the 9522A LBT. The
EXT_ON_OFF control input is pulled to a GND level to toggle the 9522A LBT on and off. Note that both
pairs of pins should be connected for EXT PWR and EXT GND.
EXT_PWR (pin 4 and 16) External power +4.4VDC input
EXT_GND (pin 3 and 17)
4.1.2 DC Power Input Specifications
The DC power requirements for the 9522A LBT are summarized in Table 5 below. Note that these
requirements apply to DC power measured at the 9522A LBT multi-interface connector input.
Input Standby Power (average)
Peak Transient Current –Transmit
Current Average –Continuous Transmit at Maximum RF Power (see note)
Power Average –Voice/Data Call (see note)
Note: The average power consumption depends on the view of the satellite constellation from the
antenna.
4.2 Control/Digital Audio (DPL bus) Interface
4.2.1 Control/Digital Audio Interface Signal Descriptions
The control/digital audio interface enables peripherals such as handsets and SIM card readers to be
interfaced to the 9522A LBT. The interface utilizes an Iridium Proprietary communication bus not detailed
in this fact sheet. Details can be made available after appropriate Non-Disclosure and/or License
Agreements are executed.
Table 4: Control/Audio Interface Signal Descriptions
Signal Name
EXT_ON_OFF (pin 1)
Table 5: DC Power Input Specifications
Parameter
Main Input Voltage Range
Main Input Voltage - Nominal
Main Input Voltage –Ripple
Consumption at +4.4 VDC
Signal Description
External power GND input
Power on/off control input
Value
+4.0 VDC to +4.8 VDC
4.4VDC
40 mV peak to peak
Value
570mW
2.5A
1.0A
2200mW
8
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