Westermo MR Series - Manual (Page 306)

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Web Interface and Command Line Reference Guide www.westermo.com
Confi gure > X25 > NUA/NUI–>Interface 4.108
Using the Web Page(s)
The Configure > X25 > NUA/NUI–>Interface pages contain tables that allows you to enter a
series of X.25 NUA or NUI values along with IP addresses/Ports to which they should be mapped if
you need to override the default settings in the Configure > Protocol Switch page.
So, if in the Protocol Switch configuration you had configured the unit to switch from LABP 0 to
TCP, the IP Address and Port values would normally be determined from the XOT Remote IP
address and IP stream port parameters. However, having set up the NUA/NUI to IP addresses table
as shown in the example above, if an X.25 call with NUA of value “222” is received on LAPB 0 it
will be switched onto a TCP socket using IP address “1.2.3.4” on port 45 instead of those settings
configured on the Configure > Protocol Switch page.
Similarly, NUIs can also be matched and in this example a call with NUI of value “test” will be
switched onto a TCP socket using IP address “100.100.100.1” on port 678.
All 3 comparison fields, NUA, NUI and Call Data, can use the wildcard matching characters “?” and
“*”. In the example shown above when an X.25 call is received with either the NUA having “1234”
followed by any 2 digits or a call being received with call user data with any 4 characters followed
by “aa” then the call is switched to a TCP socket on address 100.100.100.52 on port 4001.
When a connection has been successfully established and data is being switched from the X.25
call to the socket and from the socket to the X.25 connection, it can be terminated by either the
socket clos ing or the X.25 call clearing.
If the connection terminates because of an incoming X25 Call Clear packet then the switch will
termi nate the socket connection. If the connection terminates because the socket is closed then the
switch will clear the X.25 call by transmitting a CALL CLEAR packet.