The DEC Network Integration Server supports these tracepoints:

 	HDLC LINK <link_name or *>
 	LAPB LINK <link_name or *>
 	LLC2 SAP LINK <link_name or *>
 	MODEM_CONNECT LINE <line_name or *>
 	NSP PORT <port_name or *>
 	ROUTING CIRCUIT <circuit_name or *>
 	X25L3 CIRCUIT <circuit_name or *>
 	X25L3 DTE <dte_name or *>
 	X25GAP CIRCUIT <circuit_name or *>