External Modems; Basic Troubleshooting Steps - US Robotics 3CP5613 User Manual

EXTERNAL MODEMS

Basic Troubleshooting Steps

1. Is your modem turned on? When your modem is properly connected to power and is turned on, the CS light on the front panel
will be on.
2. Is your power supply connected properly to both your modem and an electrical outlet? If it is, check the outlet with another
electric device (like a lamp) to be sure that you are getting power. Also, use the power supply that came with your modem; other
similar-looking power supplies may be of different voltages and could damage your modem.
3. Are you using the proper cable to connect your modem to your computer? Make sure you are using an RS-232 modem cable.
Check the packaging of the cable you bought. There are many computer cables that look similar to an RS-232, such as a Null
Modem cable, that will not work correctly with this modem. Depending on whether you have a 9-pin or 25-pin serial port on your
computer, you will need either a DB9/DB25 or a DB25/DB25 serial cable. See the diagrams below.
You need a
DB9F/DB25M
RS-232 serial cable
You need a
DB25F/DB25M
RS-232 serial cable
T H R
ROUBLESHOOTING AND ELP ESOURCES
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