Integrating GSP-1620 Modems into OEM Products
80-99208-1 Rev. D 7-3
Modem Mechanical Description
The GSP-1620 modem is a sandwich made of two circuit card
assemblies (CCAs) that are open and unprotected. As a
result, the GSP-1620 modem must be shielded from direct
impacts, precipitation, and particulate s.
I/O is obtain ed through four c onnectors:
• Power, Data, and Control functions are accessed via a
25-pin “D” style connector.
• Globalstar RF transmit signals are routed to an
MCX-style coaxial connector (labeled J3 on the board).
• Globalstar RF receive signals are routed to an MCX-style
coaxial connector (labeled J7 on the board).
• The Diagnostic port interface is a 9-pin “D” style
connector.

Modem Board Layout

This section includes the following technical drawi ngs
depicting the modem:
• GSP-1620 Modem Board Layout (Top View), Figure 7-1
• GSP-1620 Modem Board Layout (Side and Bottom Vie w),
Figure 7-2
Note
In Figure 7-1 and Figure 7-2, dimensions are shown as: millimeters
[inches]. Millimeters are the controlling dimensions on these drawings.
Inch dimensions are for reference only .