Qualcomm GSP-1620 specifications Integrator’s Reference Manual Troubleshooting Modem Problems

Integrator’s Reference Manual

Table 8-1. Troubleshooting Modem Problems (continued)

Problem	Possible Solutions
The modem does not seem to	■ Both the AC power
be getting power, even	connector on the diagnostic
though it is plugged in.	cable and the DC power
	connector on the interface
	cable are plugged in. Only
	one can be used at a time.
	■ DTR is not asserted on a
	serial port. Connect one of
	the modem’s serial ports
	(Data, Control, or
	Diagnostic).
AT commands that you type	■ Command echoing has been
in HyperTerminal do not	turned off. Type ATE1 or ATZ
appear on the screen.	to turn echoing back on.
AT commands are not	■ Check to see if the Control
recognized on the Data port.	port is active. AT commands
	will not work on the Data
	port when the Control port is
	active.
HyperTerminal or Dial-Up	■ Make sure the baud rate in
Networking cannot talk to	HyperTerminal or Dial-Up
the modem.	Networking matches that
	for the modem port. The
	Control port is 9600 only;
	the Data port default is
	38400 but can be set to
	selected rates from 300 to
	115200.

8-2 80-99208-1 Rev. D