Digi TransPort - Page 549

Configure X.25 parameters
Digi TransPort User Guide 549
Configure X.25 PVCs parameters
A Permanent Virtual Circuit (PVC) provides the X.25 equivalent of a leased line service. With a PVC
there is no call setup or disconnect process; you can just start sending and receiving X.25 data on
a specified LCN. For each X.25 service connection you may setup up multiple PVCs each of which
uses a different LCN (or a mixture of PVCs and SVCs). Digi routers support up to four PVCs
numbered 0-3.
Enable this PVC
Enables or disables the PVC.
LCN
The LCN value to be used for this PVC. For an XOT PVC, this parameter defines the
Responder LCN field in the PVC setup packet, though an LCN of 1 is always used in the XOT
PVC connection. For an XOT PVC, this field should contain the remote connection’s LCN.
PVC Mode
The lower layer interface use for the PVC. This setting can be set to LAPB, LAPD or TCP, for
XOT mode.
Connect this PVC to PAD x
What type of upper layer interface is connected to this PVC and can be set to PAD for an X.25
PAD, TPAD for a TPAD instance, or XSW for X.25 switching. If set to XSW for the X.25 switch,
the X.25 switch must also be configured regarding the interfaces to switch this PVC to/from.
For example, if this is an incoming XOT PVC we are configuring, the Switch from XOT PVC
parameter must be set to the desired destination interface.
Use packet size
The packet size for the PVC. Select the appropriate value from the drop down list.
Use window size
The layer 3 window size for the PVC. Select the appropriate value from the drop down list.
Remote IP address
The IP address for outgoing XOT calls.
Use the source IP address from interface x,y
Which Ethernet or PPP interface to use for the source IP address.
Initiator interface
The name of the interface from which the PVC was initiated, such as Serial 1. The initiator and
responder strings identify the circuit when PVCs are being set up. They must match the names
in the remote router that terminates the XOT PVC connection. If the unit terminating the PVC
XOT connection is not another Digi router, you must refer to the documentation or the
configuration files of the other unit to determine the names of the interfaces.
Responder interface
The name of the interface to which a PVC initiator is connected, such as Serial 2.