
Microtronix Access User Guide
5.2 L2 - LAPB
The LAPB configuration page allows any of the X.25 data link layer 2 parameters to be set. The values
that MUST match to the attached X.25 equipment are the default window size and modulus. The
Emulation mode (DTE/DCE) MUST be set to the opposite of the attached peer. Other parameters are
not usually changed, but can be modified to fine-tune an interface.
5.2.1 LAPB Setup
1.In the
Device
field, select the WAN interface to configure. Once selected, the current settings for
that interface will be displayed.
2.Modify the parameters to be compatible with the attached device
.
3.In order for the configuration to take effect, the
Restart WAN Interface
box must be checked.
Otherwise the saved configuration not take effect until the next time the interface is restarted.
4.Click the
Update
button to save changes, and restart the interface if selected.
5.2.2 LAPB Parameters
Device:
The X.25 WAN interface being configured. This will be hdlc0 (WAN port 0), or hdlc1
Console/WAN port 1).
Mode:
The emulation mode may be specified as Data Connecting Equipment (DCE) or Data
Terminating Equipment (DTE). This MUST be opposite to the attached peer device.
Link Setup Start:
This configures the first mode setting frame that will be sent (or passive
operation) when the link is starting up. SABM is the usual default, but other settings may be
used to resolve compatibility issues with the peer device.
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