At!x18, At!x19, At!x20 – Eicon Networks DIVA T/A ISDN Modem User Manual
Page 52: At!x21=n, At!x22=n

Always On / Dynamic ISDN AT Commands
DIVA T/A ISDN Modem Reference Guide
◆ Page 52
AT!X18
Set Normal Mode for Bandwidth on Demand. Sets the Bandwidth on Demand
thresholds and delays to pre-configured values. ‘Normal Mode’ is equivalent to the
default values for each setting, and is defined as follows:
AT!X10=5
Sets ‘Delay before Opening 1st B-channel’ to 5 seconds.
AT!X11=70
Sets ‘1st B-channel Opening Threshold’ to 70 seconds.
AT!X12=40
Sets ‘1st B-channel Closing Threshold’ to 40 seconds.
AT!X13=5
Sets ‘Delay before Opening 2nd B-channel’ to 5 seconds.
AT!X14=70
Sets ‘2nd B-channel Opening Threshold’ to 70 seconds.
AT!X15=40
Sets ‘2nd B-channel Closing Threshold’ to 40 seconds.
AT!X17=1000 Sets the ‘X.25 Transmit Queue Threshold’ to 1000 bytes.
AT!X19
Set Economy Mode for Bandwidth on Demand. Sets the Bandwidth on Demand
thresholds and delays to pre-configured values. ‘Economy Mode’ is defined as
follows:
AT!X10=20
Sets ‘Delay before Opening 1st B-channel’ to 20 seconds.
AT!X11=80
Sets ‘1st B-channel Opening Threshold’ to 80 seconds.
AT!X12=60
Sets ‘1st B-channel Closing Threshold’ to 60 seconds.
AT!X13=60
Sets ‘Delay before Opening 2nd B-channel’ to 60 seconds.
AT!X14=60
Sets ‘2nd B-channel Opening Threshold’ to 60 seconds.
AT!X15=80
Sets ‘2nd B-channel Closing Threshold’ to 80 seconds.
AT!X17=2000 Sets the ‘X.25 Transmit Queue Threshold’ to 2000 bytes.
AT!X20
Set Performance Mode for Bandwidth on Demand. Sets the Bandwidth on
Demand thresholds and delays to preconfigured values. ‘Performance Mode’ is
defined as follows:
AT!X10=1
Sets ‘Delay before Opening 1st B-channel’ to 1 second.
AT!X11=50
Sets ‘1st B-channel Opening Threshold’ to 50 seconds.
AT!X12=20
Sets ‘1st B-channel Closing Threshold’ to 20 seconds.
AT!X13=1
Sets ‘Delay before Opening 2nd B-channel’ to 1 second.
AT!X14=60
Sets ‘2nd B-channel Opening Threshold’ to 60 seconds.
AT!X15=80
Sets ‘2nd B-channel Closing Threshold’ to 80 seconds.
AT!X17=500
Sets the ‘X.25 Transmit Queue Threshold’ to 500 bytes.
AT!X21=n
Specify Lowest X.25 Logical Connection Number. Specifies the lowest LCN that
X.25 will use for establishing the AO/DI connection.
Range: 1 to 4095. If you specify more than 1 LCN (using AT!X25), the upper limit of the
range is 4095 minus the number of LCNs. For example if AT!X25=4, then the upper
limit of the range is 4095-4 = 4091.
Default: 1.
AT!X22=n
Enable/Disable AO/DI. Specifies whether the AO/DI feature is enabled or disabled.
n=0
Off (default).
n=1
On.