Digi TransPort WR11 - Configure TPAD Parameters

Configuring legacy protocols Configure TPAD parameters
Digi TransPort® Routers User Guide
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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.
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1. Go to Configuration > Network > Legacy Protocols > TPAD >TPADn.
2. Set TPADparameters:
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.
3. Set ISDNparameters: