User`s guide

258
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
This section is used to specify a backup interface that will be used automatically if the call to
the primary interface fails. Note that the primary interface will be tried first for every new
call attempt.
ISDN settings
Use number x to make outgoing ISDN calls
This parameter may be used to specify an ISDN number. This is used in cases where no
ISDN number is provided with the ATD command when making an outgoing call.
Use prefix x
This parameter is used to specify a dialling code that the unit will place in front of the
telephonenumber that is issued by the terminal in the ATD command. For example, if the
Prefix # was set to 0800 and the number specified by the terminal in the ATD command
was 123456, the actual number dialled by the unit would be 0800123456.
Remove prefix x from number in ATD command
This parameter is used to specify a dialling prefix that is normally inserted by the terminal in
the ATD command that is removed by the unit before dialling takes place. For example, if
the Prefix removal # was set to 0800 and the terminal issued an ATD command containing
0800123456 then the actual number dialled by the unit would be 123456.
Use suffix x
The Suffix # parameter may be set to contain additional numbers that are dialled after the
number specified by B-channel ISDN #. For example, if B-channel ISDN # was set to
123456 and Suffix # was set to 789, the actual number dialled would be 123456789.
On the main interface Deactivate LAPB session x seconds after TPAD X.25 call has
been cleared
Once a TPAD X.25 call has been cleared, the unit will keep a LAPB instance active for the
length of time set by this parameter. This is to allow further TPAD transactions to take place
without having to make another ISDN call. The default value of 10 seconds should be
acceptable for most applications. The value of 1 is a special value which means terminate
layer 2 immediately the transaction is finished. (When the X.25 call is cleared.)
If you select LAPD as the TPAD layer-2 interface, this value will automatically be set to 0 to
disable layer-2 deactivation. You may still override the 0 setting by entering a new value
but note that most network service providers prefer that LAPD connections are not
repeatedly deactivated.
On the backup interface Deactivate LAPB session x seconds after TPAD X.25 call
has been cleared.
This is equivalent to the deactivation timer above but applies only to backup calls.
With X.25 over ISDN D-channel mode
Send X.25 RESTART packets
d
Delay the X.25 RESTART packets by x milliseconds
d
X.25 settings