Westermo MR Series - Manual (Page 319)

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Web Interface and Command Line Reference Guide www.westermo.com
Confi gure > X25 > PVCs > PVC n 4.111
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). Westermo routers support up to four PVCs
numbered 0-3.
Using the Web Page(s)
Each of the Configure > X25 > PVCs pages allow you to define the parameters for one of the
available X.25 PVCs. The parameters are as follows:
LCN:
This is the LCN value to be used for this PVC. In the case of 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). So for an XOT PVC this field should contain the remote connec-
tions LCN.
Layer 2 interface:
This parameter defines the lower layer interface to be used for the PVC and can be set to
“LAPB”, “LAPD” or “TCP” (for XOT mode).
Layer 2 interface #:
This parameter is used to specify which Layer 2 instance will be used for this PVC (“0” or “1”
for LAPB, “0”, “1” or “2” for LAPD and “0” for TCP).
Remote IP address (XOT only):
This is the IP address to be used for outgoing XOT calls.
XOT source IP address interface:
This parameter specifies the source if the IP address for XOT calls. It can be set to “Auto”,
“ETH” or “PPP”.
XOT source IP address interface #: If XOT source IP address interface is set to “ETH” or “PPP”,
this parameter defines which Ether net or PPP interface to use for the source address.
Initiator interface (XOT only):
This parameter may be set to the “name” of the interface from which the PVC was initiated, e.g.
Serial 1. The initiator and responder strings are used to identify the circuit when PVCs are being
set up. They must match the names in the remote unit that terminates the XOT PVC connec-
tion. If the unit terminating the PVC XOT connection is not another Westermo unit then you
need to refer to the documentation or the configuration files of the other unit to determine
the names of the interfaces.
Responder interface (XOT only):
This parameter may be set to the name of the interface to which a PVC initiator is connected,
e.g. Serial 2.
Upper layer interface:
This parameter defines 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).
Note that if set to “XSW” (for the X.25 switch) then the X.25 switch will need to also be con-
figured regarding the interfaces to switch this PVC to/from. For example, if this is an incoming
XOT PVC we are con figuring then the Switch from XOT PVC parameter needs to be set to
the desired destination interface.