insys icom 56k Manual page 86

AT Command Reference
Command
ATL<n>
AT%L
AT*L<n>
ATM<n>
86
Description
Speaker volume
This command regulates the speaker volume (see command ATM).
ATL1
Speaker volume low (default)
ATL2
Speaker volume medium
ATL3
Speaker volume high
Display level of the received signal
The value that is reported from the INSYS Modem 56k AC/DC 4.2 equals the al-
ready amplified level within the INSYS Modem 56k AC/DC 4.2, 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 AC/DC 4.2 will
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 at-
tempt 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 high-
er 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
ATM1
Speaker ON during dialing and connection setup (default)
ATM2
Speaker always ON
ATM3
Speaker on during connection setup
INSYS Modem 56k AC/DC 4.2