NST - Application Control-Level Statistics Segment

The NST segment allows application control-level statistical information to be passed between the various systems on the network. Some fields in this segment refer to portions of lower level protocols; they contain information that can be used by application management applications monitoring the state of various network links.

Usage Notes: Fields 2-15. These are all marked optional since the statistics kept on a particular link and negotiated between the two systems in question will vary. Not all values will apply to each system. Some values are concerned with the type of port, and some values pertain to the lower level protocol.

HL7 Attribute Table - NST - Application Control-Level Statistics Segment

Seq#	Data Element Name	DataType	Usage	Vocabulary	Cardinality	Item #	Length	C.LEN	Flags
NST
1	Statistics Available	ID	R	0136(R) Yes/no Indicator(Required)	[1..1]	01173	[1..1]
2	Source Identifier	ST	O		[0..1]	01174
3	Source Type	ID	O	0332(R) Source Type(Required)	[0..1]	01175
4	Statistics Start	DTM	O		[0..1]	01176
5	Statistics End	DTM	O		[0..1]	01177
6	Receive Character Count	NM	O		[0..1]	01178
7	Send Character Count	NM	O		[0..1]	01179
8	Messages Received	NM	O		[0..1]	01180
9	Messages Sent	NM	O		[0..1]	01181
10	Checksum Errors Received	NM	O		[0..1]	01182
11	Length Errors Received	NM	O		[0..1]	01183
12	Other Errors Received	NM	O		[0..1]	01184
13	Connect Timeouts	NM	O		[0..1]	01185
14	Receive Timeouts	NM	O		[0..1]	01186
15	Application control-level Errors	NM	O		[0..1]	01187

NST-1: Statistics Available (ID) 01173

Definition: This field indicates the availability of statistics. Refer to HL7 Table 0136 - Yes/no Indicator for valid values.

N - the responding application does not keep any statistics. If the value "N" is specified, the response message is used to signify to the initiating application that the communication link between the initiating application and the responding application is operational (and fields 2-15 are empty in the response message).

Y - the responding application does keep statistics, fields 4 and 5 are required (and the response message contains one or more not empty or not unvalued fields in the range 2-3, 6-15).

NST-2: Source Identifier (ST) 01174

Definition: This field identifies a particular lower level link (e.g., a port number).

NST-3: Source Type (ID) 01175

Definition: This field identifies (in certain systems) whether a lower level source identifier is an initiate or accept type. Refer to HL7 Table 0332 – Source Type in Chapter 2C, Code Tables, for valid values.

NST-4: Statistics Start (DTM) 01176

Definition: This field contains the date/time stamp of the start of the collection of the statistics reported in fields 6-15 of this segment. It is strongly recommended that this value include seconds.

NST-5: Statistics End (DTM) 01177

Definition: This field contains the date/time stamp of the end of the statistics collection period reported in fields 6-15 of this segment. It is strongly recommended that this value include seconds.

NST-6: Receive Character Count (NM) 01178

Definition: This field contains the number of characters received.

NST-7: Send Character Count (NM) 01179

Definition: This field contains the number of characters sent.

NST-8: Messages Received (NM) 01180

Definition: This field contains the number of messages received.

NST-9: Messages Sent (NM) 01181

Definition: This field contains the number of messages sent.

NST-10: Checksum Errors Received (NM) 01182

Definition: This field contains the number of messages received with checksum errors.

NST-11: Length Errors Received (NM) 01183

Definition: This field contains the number of messages received with length errors.

NST-12: Other Errors Received (NM) 01184

Definition: This field contains the number of "other" invalid messages received (excluding length and checksum errors).

NST-13: Connect Timeouts (NM) 01185

Definition: This field contains the number of connect timeout errors.

NST-14: Receive Timeouts (NM) 01186

Definition: This field contains the number of timeouts while waiting for a response to an initiated message.

NST-15: Application control-level Errors (NM) 01187

Definition: This field contains the number of application control-level errors in response to an initiated message.