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

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).

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

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.

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.

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.

Definition: This field contains the number of characters received.

Definition: This field contains the number of characters sent.

Definition: This field contains the number of messages received.

Definition: This field contains the number of messages sent.

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

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

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

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

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

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