User`s manual

Troubleshooting
Troubleshooting
Vlll
2726
When I Restart My Computer (using a Windows operating system) the Modem is
not
Detected.
Verify that the modem cable is connected directly to a wall jack and that there is
a dial tone (see pg 7).
Make sure the modem is initialized correctly. Issuing AT&FS and pressing Enter
(see “AT Commands”pg 27 ) will reset the modem to its factory default settings.
The Modem Does Not Dial
Make sure the modem is turned on, and connected to a working phone line. To
ensure the phone line is functioning properly, plug in a telephone and make sure
there is a dial tone.
The Modem Dials But it Does Not Connect
First, make sure the communications software is configured to the same COM Port
and IRQ setting. Second, verify that the phone line is working properly as laid out
in the previous troubleshooting section.
The Modem Reports a Busy Signal
First, verify that your call waiting modem is connected directly to the wall phone
jack because if you there is a splitter then the modem will not to function proper-
ly. Second, in your Internet provider setting’s, please make sure that you do not
have a *70 in front of the access number. The *70 disables call waiting, therefore
giving whoever calls, a busy signal.
To check that the modem was installed correctly and to determine what COM port and
IRQ are assigned follow the steps below.
1) On the desktop click Start then Settings and Control Panel. Double click
Modems.
2) Select the tab Diagnostics and then select More Info.
Troubleshooting
Vlll
AT Command Sets
There may be times when you need to access the modem manually with AT commands.
Commands may be sent to your modem from a PC running communications software.
Command Format
All commands must begin with the AT prefix, followed by the parameter and ending
with the ENTER key. All commands may be typed in either upper or lower case, but
not mixed A command without any parameters will be considered as specifying the
same command with a parameter of “0”. The maximum command length is eight (8)
characters. The modem does not count the AT prefix, carriage returns, or spaces.
Example: ATH
This command causes your modem to hang up.
Basic AT Commands
In the following listings, all default settings are printed in bold text.
Command Function
A/ Repeat last command. Do not precede A/ with
AT or follow with ENTER
A Answer
D_ Dial command
P Select pulse dialing; affects current and subsequent dialing
T Select tone dialing; affects current and subsequent dialing
En Command echo
E0 Disables echo
E1 Enables echo (default)
Hn Switch hook Control
H0 Hangs up the telephone line (default)
H1 Picks up the telephone line
Ln Speaker volume