
Configuring WAN Line Services
2-28 117021-A Rev. A
Enabling or Disabling LAPB Services
The router enables LAPB line services when you configure a synchronous circuit
for the X.25 protocol. You can disable and reenable LAPB services on the
interface without moving any physical cabling.
Setting the Station Type
The Station Type parameter identifies whether the device is a DTE or DCE, for
this interface.
If your device is data terminal equipment, select DTE. If your device is data
communications equipment, select DCE.
If you do not want to assign a specific station type, and instead want the network
to determine the station type, choose DXE. This value indicates that the router is
in unassigned mode; it is neither a DTE nor a DCE. If you select DXE, the router
will send an exchange identification (XID), but negotiation will not take place
until the network assigns a station type.
By default, the station type is DTE. Set the station type of the interface to DCE or
DTE.
Setting the Control Field
The Control Field parameter specifies the desired window size, or modulo, of the
sequence numbering the router uses to number frames:
• Modulo 8
• Modulo 128
By default, the control field is set to Modulo 8. Set the control field on the
interface.
Site Manager: Enable parameter: page A-16
Site Manager: Station Type parameter: page A-16
Site Manager: Control Field parameter: page A-17
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