Configure X.25 parameters
Digi TransPort User Guide 536
Use PAD over interface
Selects whether the PAD instance uses ISDN B-channel X.25, ISDN D-channel X.25, TCP, UDP,
VXN, SSL TCP or SSL XoT as the transport protocol.
• For ISDN D-channel operation, select the LAPD option is selected.
• For ISDN B-channel operation or operation through a synchronous port, select LAPB.
• For LAPB and LAPD, you can also specify an interface number.
This parameter specifies which LAPB or LAPD instance to use for the relevant TPAD instance.
Select 0 or 1 for LAPB or 0 or 1 for LAPD.
Use backup interface
A backup interface used automatically if the call to the primary interface fails. The primary
interface is tried first for every new call attempt.
X.25 Settings
Default X.25 packet size
The default X.25 packet size. This can be set to 16, 32, 64 128, 256, 512 or 1024, but the actual
values permitted are normally constrained by your service provider.
Answer incoming calls from NUA
The NUA that the router responds to for incoming X.25 calls.
Only answer calls with CUG
The PAD will only answer calls with this Call User Group (CUG) specified.
Use X.25 Call Macro macroname to an ATD command
The name of an X.25 call macro used when an ATD command is received by the router. The
ATD command is ignored, and a PAD CALL command using the macro replaces it. The purpose
of this feature is to allow non-PAD terminals to use an X.25 PAD network connection. X.25 call
macros are set up in the Configuration > Network > Legacy Protocols > X.25 > Call Macros
web page, or by using the macro text command.
Use NUA
This NUA is used as the calling NUA when an outgoing X.25 call is made.
LCN
The router supports up to 8 logical X.25 channels. In practice, the operational limit is
determined by the particular service to which you subscribe (usually 4). Each logical channel
must be assigned a valid Logical Channel Number (LCN). The LCN parameter is the value of
the first LCN that will be assigned for outgoing X.25 CALLs. The default is 1027.
For incoming calls, the router accepts the LCN specified by the caller.
LCN Direction
Whether the LCN used for outgoing X.25 calls is incremented or decremented from the
starting value when multiple X.25 instances share one layer 2 (LAPB or LAPD), connection. The
default is Down and LCNs are decremented, such as if the first CALL uses 1024, the next will
use 1023, etc. Setting the parameter to Up causes the LCN to be incremented from the start
value.
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