Insys Modem 56k 4.1 11-02-01-01-40.028 Benutzerhandbuch

INSYS Modem 336/56k 4.1 (UL) 

FAQ 

Problem:  

Possible cause: 

Remedy 

It is not possible to establish a 
phone connection. 

The modem dials with the pulse 
dialing method instead of the 
required tone dialing method, or 
vice versa. 

You can determine if your phone 
system dials with pulses or tones: 
If you hear a rattling on the line 
during dialing, you are using pulse 
dialing. The dialing types can be 
switched with the commands 

 or ATDT. 

See also Chapter 9 “AT Command 
Set”, commands ATDP,ATDT, 

. 

The modem can send data, but 
can’t receive data. 

The data flow control settings 
(RTS/CTS) are wrong.  

See Chapters 5.2.4 to 5.2.6 “Data 
flow control”. 

The modem does not cooperate 
with a particular communica-
tion program. 

The communication program 
expects a certain data flow con-
trol type. The modem has not 
been set to the required type.  

Setting the modem to the re-
quired data flow control type will 
solve the problem. Most of the 
time, the used communication 
program allows the creation of an 
initialization string, in which the 
necessary settings can be entered. 
This string is transmitted to the 
modem during the program start. 

See also the manual for the used 
software and Chapters 5.2.4 to 
5.2.6 “Data flow control”. 

The modem cannot communi-
cate with another modem, or 
only with errors. 

The other modem uses a trans-
mission protocol, which the local 
modem cannot understand.  

Using the data compression type 
and error protocol required by the 
other modem will solve the prob-
lem. 

(See also Chapters 5.3 and 5.4 
“Error Correction” and “Data Com-
pression”). 

 

July 06 

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