OGi Modem - Hardware Guide
© ORBCOMM Proprietary 17 T401, Version .15
Typical Inrush Current on MAIN_POWER at 12 V
Amplitude (mA)
Period (µs)
Charge (µC)
Power Up
700
3000
400
GPS Power Up
80
350
50
Receive Power Up
90
200
60
Transmit Power Up
900
3000
1100
3.5 Serial Interface
The serial defaults to the following settings: 9600 bit/s (8 data, no parity, 1 stop bit) with
debug default of 115,200 bit/s (8 data, no parity, 1 stop bit).
The master and debug ports are configurable. Voltages for these ports are 3.3 VDC
CMOS logic levels.
Parameter
Minimum
Typical
Maximum
Units
DEBUG_RX input
2.7
3.3
3.6
VDC
MASTER_RX input
2.7
3.3
3.6
VDC
DEBUG_TX output
2.7
3.3
3.6
VDC
MASTER_TX output
2.7
3.3
3.6
VDC
3.5.1 Master Reset
The MASTER_RESET resets the modem to its default startup state. The
MASTER_RESET pin is open drain and has an internal 10 KΩ pull-up.
Parameter
Maximum
Units
MASTER_RESET pulled high
3.3
V
MASTER_RESET
<500
µA
3.6 Frequency
The table below lists the modem's operating frequencies.
Parameter
Value
Receive frequency band
(to-mobile)
1525 to 1559 MHz, channel bandwidth 5 kHz
1518 to 1525 MHz, channel bandwidth 5 kHz
Transmit frequency band
(from-mobile)
1626.5 to 1660.5 MHz, channel bandwidth 2 kHz
1668 to 1675 MHz, channel bandwidth 2 kHz
GNSS Band
GPS L1; GLONASS L1; BeiDou B1
3.7 Antenna Specifications
The antenna is available in two types: standard and low elevation.
