INSYS 56k Small INT 2.0 Manual Manual page 61

INSYS Modem 56k Small INT 2.0
Command
ATL<n>
AT%L
AT*L<n>
ATM<n>
Description
Speaker volume
This command regulates the speaker volume (see command ATM).
Speaker volume low (default)
ATL1
Speaker volume medium
ATL2
ATL3 Speaker volume high
Display level of the received signal
The value that is reported from the INSYS Modem 56k Small INT 2.0 equals the already
amplified level within the INSYS Modem 56k Small INT 2.0, not the phone line level.
Large AT%L responses imply a low signal level; small values imply a high signal level
(009 = -9db, 043 = -43db)
Determines the automatic speed limitation
The automatic speed limitation is used to automatically achieve the least possible error
rate for connections without error correction.
In the factory settings the speed limitation is always switched on (AT*L0).
If the limitation is switched off (AT*L1), the INSYS Modem 56k Small INT 2.0will always
establish the connection on the phone side with the maximum possible speed (or the
speed defined with AT+MS), irrespective of the data rate at the serial interface. This
means that the INSYS Modem 336 will, for example, always attempt to establish a
33600 baud connection, even if the serial interface is only set to 9600 baud. Without
error correction the high speed will obviously lead to higher bit error rates, which is
usually disruptive.
The automatic speed limitation (AT*L0) will limit the speed on the phone side to the
speed of the serial interface.
It should only be switched off if very low baud rates are employed or if the speed of the
serial interface is changed during the connection.
Speaker control
This command regulates when the speaker is active
(see command ATL<n>).
ATM0 Speaker always OFF
Speaker ON during dialing and connection setup (default)
ATM1
ATM2 Speaker always ON
ATM3 Speaker on during connection setup
AT Command Reference
61