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C.2.2 NST - statistics segment

The NST segment allows network 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 network management applications monitoring the state of various network links.

Figure C-2. NST attributes

SEQ

LEN

DT

R/O

RP/#

TBL#

ITEM#

ELEMENT NAME

1

1

ID

R


0136

01173

Statistics Available

2

30

ST




01174

Source Identifier

3

3

ID




01175

Source Type

4

26

TS




01176

Statistics Start

5

26

TS




01177

Statistics End

6

10

NM




01178

Receive Character Count

7

10

NM




01179

Send Character Count

8

10

NM




01180

Messages Received

9

10

NM




01181

Messages Sent

10

10

NM




01182

Checksum Errors Received

11

10

NM




01183

Length Errors Received

12

10

NM




01184

Other Errors Received

13

10

NM




01185

Connect Timeouts

14

10

NM




01186

Receive Timeouts

15

10

NM




01187

Network Errors

C.2.2.0 NST field definitions

C.2.2.1 Statistics available (ID) 01173

Definition: This field contains an indicator if statistics are available. Refer to HL7 table 0136 - Yes/no indicator for valid values.

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

Y - the responding system does keep statistics", fields 4 and 5 are required, (and the response message contains one or more non-null fields in the range 2-3, 6-15).

C.2.2.2 Source identifier (ST) 01174

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

C.2.2.3 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 - Network source type for valid values.

Value

Description

I

Initiate

A

Accept

C.2.2.4 Statistics start (TS) 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.

C.2.2.5 Statistics end (TS) 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.

C.2.2.6 Receive character count (NM) 01178

Definition: This field contains the number of characters received.

C.2.2.7 Send character count (NM) 01179

Definition: This field contains the number of characters sent.

C.2.2.8 Messages received (NM) 01180

Definition: This field contains the number of messages received.

C.2.2.9 Messages sent (NM) 01181

Definition: This field contains the number of messages sent.

C.2.2.10 Checksum errors received (NM) 01182

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

C.2.2.11 Length errors received (NM) 01183

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

C.2.2.12 Other errors received (NM) 01184

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

C.2.2.13 Connect timeouts (NM) 01185

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

C.2.2.14 Receive timeouts (NM) 01186

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

C.2.2.15 Network errors (NM) 01187

Definition: This field contains the number of network errors in response to an initiated message.

C.2.2.16 NST use 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.

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