Digi TransPort WR11 User Manual page 601

Configuring legacy protocols
4. Set X.25 parameters:
When making an outgoing X.25 call
Default X.25 Packet Size
The default X.25 packet size for TPAD transactions.
Use NUA
The X.25 Network User Address for outgoing X.25 calls if no NUA is specified in the call string.
Use NUI
The X.25 Network User Identifier for outgoing X.25 calls if no NUI is specified in the call string.
LCN
The router supports up to eight logical X.25/TPAD 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
Specifies whether the X.25 LCN for outgoing TPAD calls is incremented or decremented from
the starting value when multiple TPAD 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
Digi TransPort® Routers User Guide
Configure TPAD parameters
601