Configure network interfaces Configure ISDN interfaces
Digi TransPort WR Routers User Guide 245
ISDN LAPD parameters
This page allows you to configure the ISDN LAPD interfaces. Link Access Protocol D (LAPD) is the
protocol for ISDN D-channel signaling and call setup.
You can use LAPD 0 and LAPD 1 as required for SAPI 16 traffic (such as X.25 over D-channel). LAPD 2
is normally reserved for ISDN call control.
Enable LAPD n
Disabling this parameter disables the LAPD instance. This may be necessary if you have an
installation where two or more routers are connected to the same ISDN S bus. In this case, only
one of the routers may be configured for D-channel X.25 on TEI1, SAPI16. On each of the other
routers you must disable any LAPD instance for which the TEI is set to 1 in order to prevent it
from responding to X.25 traffic on that TEI that is actually destined for another router.
When checked, this check box will also reveal the following configuration parameters.
Mode
When the DTE/DCE mode parameter is set to DTE, the router behaves as a DTE. This is the default
value and should not be changed for normal operation across the ISDN network. If your
application involves using two routers back-to-back, one of the routers should have the DTE
mode value set to DCE.
N400 Counter
The standard LAPB/LAPD retry counter. The default value is 3 and it should not normally be
necessary to change this.
RR Timer n msecs
The standard LAPB/LAPD Receiver Ready timer. The default value is 10,000ms (10 seconds) and
it should not normally be necessary to change this.
T1 Timer n msecs
The standard LAPB/LAPD timer. The default value is 1000 milliseconds (1 second) and it should
not normally be necessary to change this.
T200 Timer n msecs
The standard LAPB/LAPD re-transmit timer, in milliseconds. The default value is 1000
milliseconds (1 second) and it should not normally be necessary to change this.
ppp n dlstopkb 0-2147483647 Stop data from being transmitted after n units
ppp n dlrstday 0-255 Reset the data limit on the n day of the month
Entity Instance Parameter Values Equivalent web parameter
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