Modem Control/Dial-up Connections
FP Modem-EU Technical Manual
3.10 Transmission Modes
Four different modes can be adjusted for data transmission via the telephone line:
• NORMAL mode: automatic adjustment of the line transmission speed, no error
correction, no data compression
• DIRECT mode: command sets modem to direct data connection, RS232C baud rate =
transmission speed (error correction is switched off)
Avoid this mode if you have little experience with modems. Under certain
circumstances the DIRECT mode can make it impossible for you to contact the
modem!
• RELIABLE mode: automatic adjustment of the line transmission speed, functions only
with the error correction, either according to LAPM or to MNP 2-4, the modem hangs up
if the remote modem does not allow error correction, data compression according to
V.42bis or MNP 5
• AUTO-RELIABLE mode: automatic adjustment of the line transmission speed,
automatic selection of the error correction method according to V.42 or MNP if the
remote modem does not allow error correction, the modem functions in NORMAL
mode, data compression is possible according to V.42bis or MNP 5
Tip:
In case of a noisy telephone line please reduce the maximum transmission rate
by reducing the RS232C baud rate, i.e. leave the line transmission speed
selection at automatic with ATF0 and set the RS232C baud rate with AT*W.
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