Product specifications

GSP-1620 Modem Product Specification
80-99240-1 Rev. D 5-9
Diagnostic Port
The Diagnostic port consists of a single DE-9 male upright
connector, located on the right side of the GSP-1620 modem
(see Figure 5-1).
The Diagnostic port allows a modem to be service-
programmed or modem software to be upgraded, using the
Globalstar User Terminal Program Support Tool (UTPST).
The Diagnostic port has the following characteristics:
• Uses TTL levels, un-translated
• TxD, RxD, RTS and CTS for hardware flow control
• DTR to turn on the modem from the UTPST
23 SPKR_P Analog Output from
Modem
Analog speaker output
(Reserved for Future
Use)
24 SPKR_N Analog Output from
Modem
Analog speaker output
(Reserved for Future
Use)
25 MODULE_
RESET_N
TTL Input to Modem Hard reset of the
modem, inverted logic.
This line should be left
floating for normal
modem operation. In
case the application
detects that the modem
is not responding, it
can initiate a hard
reset of the modem by
pulling this line low
(below 0.3V) for more
than 5 seconds. The
modem will reboot
after the line is allowed
to float.
Table 5-1. Interface Connector Pinouts (continued)
Pin
number
Signal Name Signal
level
Direction
User <-> Modem
Description