Product specifications

GSP-1620 Modem Overview
2-2 80-99240-1 Rev. D
The GSP-1620 modem is a bare board “sandwich” stack of
Circuit Card Assemblies (CCA) containing two boards:
• Globalstar RF board — includes the LNA, RF power amp,
upconverters and downconverters, TCXO, synthesizers,
and the remaining power electronics.
• Globalstar Digital board — includes the processor, the
modem, and some of the power management electronics.
QUALCOMM offers the GSP-1620 modem without a
mechanical enclosure, anticipating that OEMs will integrate
and package the modem with the end-user’s application.
The GSP-1620 modem operates in the “Globalstar (or
satellite) data mode only,” as opposed to the GSP-1600
Tri-Mode Phone, which has additional terrestrial cellular
(analog and digital) and voice capabilities. The GSP-1620
modem is powered by an external power source provided by
the user.
A weatherproof Dielectric Resonator Antenna (DRA),
sometimes referred to as an Outdoor Unit (ODU), comes with
each modem. OEMs provide antenna cables (SMA to MCX
connectors), to meet customer antenna-cable length needs.
A single DB-25 (male) connector is used for the user interface
port. The DB-25 carries DC power, as well as the Data and
Control RS-232 signals, between the Supervisory Control and
Data Acquisition (SCADA) application (the (data terminating
equipment or DTE) and the modem (the data communications
equipment or DCE).
A Diagnostic port on the modem allows network provisioning
(service programming) and software upgrades.