2.2 NLI Commands

Solstice X.25 NLI provides a series of NLI commands contained within C structures. These determine the format of the control parts of putmsg and getmsg. The NLI commands correspond to X.25 packet types, and are used to communicate with the network. For example, when an application passes down the NLI command N_CI to a stream using putmsg, this is translated into an X.25 Call Connect by the PLP module. When the PLP module receives a Connect Indication, it translates it into an N_CI command which is passed up to the application using a getmsg system call.

Table 2-1 summarizes the structures and their corresponding Packet Types and NLI Commands. Refer to the sections indicated for detailed information.

Table 2-1 NLI Commands and Structures

NLI Command	X.25 Packet	NLI Structure	See section
N_Abort	Abort Indication	xabortf	"6.4.1 N_Abort--Abort Indication"
N_CC	Call Response/ Confirmation	xccnff	"6.4.2 N_CC--Call Response/Confirmation"
N_CI	Call Request/ Indication	xcallf	"6.4.3 N_CI--Call Request/Indication"
N_DAck	Data Acknowledgment Request/Indication	xdatacf	"6.4.4 N_DAck--Data Ack Request/Indication"
N_Data	Data	xdataf	"6.4.5 N_Data--Data"
N_DC	Clear Confirm	xdcnff	"6.4.6 N_DC--Clear Confirm"
N_DI	Clear Request/Indication	xdiscf	"6.4.7 N_DI--Clear Request/Indication ""6.4.13 N_RI--Reset Request/Indication"
N_EAck	Expedited Data Acknowledgment	xedatacf	"6.4.8 N_EAck--Expedited Data Acknowledgement"
N_EData	Expedited Data	xedataf	"6.4.9 N_EData--Expedited Data"
N_RC	Reset Response/Confirm	xrscf	"6.4.12 N_RC--Reset Response/Confirm"
N_RI	Reset Request/Indication	xrstf	"6.4.13 N_RI--Reset Request/Indication"

The following commands and structures are also provided. They do not correspond to X.25 packet types:

Table 2-2 PVC and Listening Commands and Structures

NLI Command	NLI Structure	Description	See section
N_PVC_ATTACH	pvcattf	Specify X.25 service to use with PVC	"6.4.10 N_PVC_ATTACH--PVC Attach "
N_PVC_DETACH	pvcdetf	Specify X.25 service to stop using with PVC	"6.4.11 N_PVC_DETACH--PVC Detach "
N_Xcanlis	xcanlisf	Cancel listening	"6.4.14 N_Xcanlis--Listen Cancel Command/Response"
N_Xlisten	xlistenf	Listen for incoming calls	"6.4.15 N_Xlisten--Listen Command/Response"