Configure X.25 parameters
Digi TransPort User Guide 537
NUI/NUA selection
If both an NUI and an NUA are included in the call string, this parameter allows the router to
filter one of these out of the X.25 call request. This can be extremely useful in backup
scenarios. Consider the following example; the router is configured to do online
authorizations via the ISDN D channel and to fall back to B-channel (if the D-channel host did
not respond for any reason). Using this parameter in conjunction with the backup equivalent,
it is possible to configure the router to use the supplied NUA to connect over D-channel and
the supplied NUI to connect over B channel (for backup).
On the backup interface LCN
The LCN parameter is used to set the first LCN that will be used for the backup interface.
On the backup interface LCN Direction
Whether the LCN used for the backup X.25 interface is incremented or decremented from the
starting value when multiple X.25 instances share a single layer 2 connection.
On the backup interface NUI/NUA selection
If both an NUI and an NUA are included in the call string, this parameter allows the router to
filter one of these out of the X.25 call request.
Enable X.25 Restart Packets
It is normally possible to make X.25 CALLs immediately following the initial SABM-UA
exchange. In some cases however, the X.25 network may require an X.25 Restart before it will
accept X.25 CALLs. The correct mode to select depends upon the particular X.25 service to
which you subscribe. The default value is On. This means that the router will issue X.25
Restart packets. To prevent the router from issuing Restart packets, set this parameter to
Off.
Restart delay
When the Restarts parameter is On, the Restart delay value determines the length of time in
milliseconds that the router will wait before issuing a Restart packet. The default value is 2000
giving a delay of 2 seconds.
IP Settings
Remote IP address
The destination host that will answer the XOT, TCP, SSL, or UDP call.
Remote IP Address when using the backup interface
The destination host that will answer the XOT, TCP, SSL, or UDP call if a connection via the
primary interface has failed and the PAD is configured to backup to a secondary interface that
is using an IP based protocol.
IP Stream port
The TCP or UDP port number to use for IP (but not XoT) connections.
IP length header
When set to On, and in IP Stream mode, the length of a data sequence is inserted before the
data. For the receive direction, it is assumed the length of the data is in the data stream. When
set to 8583 Ascii 4 byte, the IP length header conforms to the ISO 8583 format.
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