VAX P.S.I. Version 5.0 supports these tracepoints:

 	LAPB LINK <link_name or *>
 	LLC2 SAP LINK <link_name or *>
 	X25L3 DTE <dte_name or *>
 	X25L3 CIRCUIT <circuit_name or *>
 	X25GAP CIRCUIT <circuit_name or *>