Configure legacy protocols Configure TPAD parameters
Digi TransPort WR Routers User Guide 537
Configure TPAD parameters
TPAD is a simplified version of the X.25 PAD specification. A common use of TPAD is to conduct
credit-card clearance transactions. Digi routers support the use of TPAD over ISDN B and D-
channels, TCP, UDP, SSL, and XoT. Automatic back-up between any two of these “layer 2 interfaces”
or “transport protocols” is supported.
TPAD configuration pages parameters
TPAD parameters are configured on the Configuration > Network > Legacy Protocols > TPAD page
and associated pages.
L
Use TPAD over interface
Selects whether the TPAD instance will use ISDN B-channel X.25, ISDN D-channel X.25, TCP, VXN
or SSL as the transport protocol. For ISDN D-channel operation, select LAPD” option. For ISDN B-
channel operation or operation through a synchronous port, select LAPB. In the case of LAPB
and LAPD an interface number can also be specified. This parameter specifies which LAPB or
LAPD instance to use for the relevant TPAD instance. Select 0 or 1 for LAPB. or 0 or 1 for LAPD.
When using LAPB with ISDN, this parameter may be set to 255, which means use any free LAPB
instance. This is useful when more than 2 POS terminals are connected to the router and the
acquirer does not support multiple Switched Virtual Circuits (SVCs) on a single B-Channel. A
value of 254 uses an available LAPB instance, but will use the same ISDN B channel if two calls
are attempted to the same ISDN number at the same time. (All services that the POS terminals
may dial must support multiple SVCs if using the setting 254.)
Use backup interface
Specifies a backup interface to use automatically if the call to the primary interface fails. Note
that the primary interface will be tried first for every new call attempt.
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