Always On / Dynamic ISDN ATCommands
DIVA T/A ISDN Modem Reference Guide ◆ Page 50
AT!X6 =n X.25 Maximum Window Size. Specifies the X.25 maximum window size. It is
sometimes desirable to have a large window size. This is particularly true for satellite
networks that have significant transmission delays.
Maximum window size can never be exceeded. If a larger window size is reques ted
when the call is established (through X.25 Facilities field), it is negotiated downward
so that the maximum window size is respected.
Default: 7.
Use a value that is greater than or equal to the default window size.
AT!X7 =n X.25 Default Packet Size. Specifies the X.25 default packet size. This packet size is
used if no packet size is specified in the X.25 facilities field when a call is made.
Values: 16, 32, 64, 128, 256, 512, 1024 , 2048, 4096.
Default: 128.
AT!X8 =n X.25 Maximum Packet Size. Specifies the X.25 maximum packet size. Maximum
packet size can never be exceeded. If a larger packet size is requested when the call is
established, it will be negotiated downward so that the maximum packet size is
respected.
Use a value that is greater than or equal to the default packet size.
Values: 16, 32, 64, 128, 256, 512, 1024 , 2048, 4096.
Default: 256.
AT!X9 =n Terminal Endpoint Identifier (TEI). Specifies the TEI used for X.25 over the
D-channel. Your service provider assigns this value. Possible values are 0 to 63
inclusive.
Default: 21.
AT!X1 0=n Delay Before Opening 1st B-channel. Specifies the amount of time (in seconds) the
throughput on your D-channel must exceed the Opening Threshold (AT!X11=n)
before the 1st B-channel is added to the AO/DI connection.
For example, if you specify 5 seconds, and the Opening Threshold is 70%
(AT!X11=70), once the throughput on the D-channel reaches 70%, there will be a
delay of 5 seconds before the 1st B-channel is added to the AO/DI connection. If the
throughput drops below 70% during the 5 seconds, the 1st B-channel will not be
added to the connection.
Range: 0 to 65535.
Default: 5 seconds.
AT!X1 1=n 1st B-channel Opening Threshold. Specifies the threshold (percentage) that the
throughput on your D-channel must exceed before the 1st B-channel is added to the
AO/DI connection.
Range: 0 to 100.
Default: 70.
AT!X1 2=n 1st B-channel Closing Threshold. Specifies the threshold (percentage) that the
throughput on your B-channel must be below before the 1st B-channel is dropped
from the AO/DI connection.
Range: 0 to 100.
Default: 40.