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NEFSC Metadata Library > Population and Ecosystems Monitoring and Analys... > Ecosystems Surveys Branch > Fisheries Acoustic Research Program > Acoustics Research >

EK60_DataEncapsulation

Entity (ENT)  |  Northeast Fisheries Science Center (NEFSC)
GUID: gov.noaa.nmfs.inport:56972  |  Updated: August 9, 2022  |  Published / External 
Summary
Item Identification
Data Attributes
Catalog Details

Summary

Abstract

A standard encapsulation scheme is used for all data files. Each datagram is preceded by a 4 byte length tag stating the datagram length in bytes. An identical length tag is appended at the end of the datagram.

Entity Information

Data Attribute / Type Description
Length1
Long 		4 byte length tag stating the datagram length in bytes
DatagramType
Long 		The datagram type field identifies the type of datagram. ASCII quadruples are used to ease human interpretation and long term maintenance; three characters identify the datagram type and one character identifies the version of the datagram.
LowDateTime
DateTime 		Structure contains a 64-bit integer value stating the number of 100 nanosecond intervals since January 1, 1601. This is the internal ”filetime” used by the Windows NT operating system.
HighDateTime
DateTime 		Structure contains a 64-bit integer value stating the number of 100 nanosecond intervals since January 1, 1601. This is the internal ”filetime” used by the Windows NT operating system.
datagram content
Text 		data part of the datagram contains any number of bytes, and its content is highly datagram dependent.
Length2
Long 		4 byte length tag stating the datagram length in bytes

Child Items

No Child Items for this record.

Contact Information

No contact information is available for this record.

Please contact the owner organization (NEFSC) for inquiries on this record.

Item Identification

Title: EK60_DataEncapsulation
Short Name: EK60_DataEncapsulation
Status: Completed
Abstract:

A standard encapsulation scheme is used for all data files. Each datagram is preceded by a 4 byte length tag stating the datagram length in bytes. An identical length tag is appended at the end of the datagram.

Data Attributes

Attribute Summary

Rubric Score Primary Key? Name Type Description
100
 Length1 Long 4 byte length tag stating the datagram length in bytes
100
 DatagramType Long The datagram type field identifies the type of datagram. ASCII quadruples are used to ease human interpretation and long term maintenance; three characters identify the datagram type and one character identifies the version of the datagram.
100
 LowDateTime DateTime Structure contains a 64-bit integer value stating the number of 100 nanosecond intervals since January 1, 1601. This is the internal ”filetime” used by the Windows NT operating system.
100
 HighDateTime DateTime Structure contains a 64-bit integer value stating the number of 100 nanosecond intervals since January 1, 1601. This is the internal ”filetime” used by the Windows NT operating system.
100
 datagram content Text data part of the datagram contains any number of bytes, and its content is highly datagram dependent.
100
 Length2 Long 4 byte length tag stating the datagram length in bytes

Attribute Details

Length1

CC ID: 863771
Data Storage Type: Long
Required: No
Primary Key: No
Status: Active
Description:

4 byte length tag stating the datagram length in bytes

DatagramType

CC ID: 863772
Data Storage Type: Long
Required: No
Primary Key: No
Status: Active
Description:

The datagram type field identifies the type of datagram. ASCII quadruples are used to ease human interpretation and long term maintenance; three characters identify the datagram type and one character identifies the version of the datagram.

LowDateTime

CC ID: 863773
Data Storage Type: DateTime
Required: No
Primary Key: No
Status: Active
Description:

Structure contains a 64-bit integer value stating the number of 100

nanosecond intervals since January 1, 1601. This is the internal ”filetime” used by the

Windows NT operating system.

HighDateTime

CC ID: 863774
Data Storage Type: DateTime
Required: No
Primary Key: No
Status: Active
Description:

Structure contains a 64-bit integer value stating the number of 100

nanosecond intervals since January 1, 1601. This is the internal ”filetime” used by the

Windows NT operating system.

datagram content

CC ID: 863775
Data Storage Type: Text
Required: No
Primary Key: No
Status: Active
Description:

data part of the datagram contains any number of bytes, and its content is highly datagram dependent.

Length2

CC ID: 863776
Data Storage Type: Long
Required: No
Primary Key: No
Status: Active
Description:

4 byte length tag stating the datagram length in bytes

Catalog Details

Catalog Item ID: 56972
GUID: gov.noaa.nmfs.inport:56972
Metadata Record Created By: Patricia L Jones
Metadata Record Created: 2019-07-18 14:18+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2019-07-18
Owner Org: NEFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2019-07-18
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2020-07-18