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Added Note for LINK 16 Net Message Table
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(Added Note for LINK 16 Net Message Table)
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| rowspan="15" style="text-align:center;" |Network Management
| rowspan="15" style="text-align:center;" |Network Management
| style="font-weight:normal;" | Initial Entry
| style="font-weight:normal;" | Initial Entry
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the data elements, in a known time slot, required for net entry.
|-
|-
|J0.1
|J0.1
| style="font-weight:normal;" | Test Message
| style="font-weight:normal;" |Test Message
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used for terminal test and performance evaluation.
|-
|-
|J0.2
| J0.2
| style="font-weight:normal;" | Net Time Update
| style="font-weight:normal;" |Net Time Update
| style="font-weight:normal;" |
| style="font-weight:normal;" |Adjusts the system time to a standard time.
|-
|-
|J0.3
|J0.3
| style="font-weight:normal;" | Time Slot Assignment
| style="font-weight:normal;" |Time Slot Assignment
| style="font-weight:normal;" |
| style="font-weight:normal;" |Permits dynamic assignment of time slots.
|-
|-
|J0.4
|J0.4
| style="font-weight:normal;" | Radio Relay Control
| style="font-weight:normal;" |Radio Relay Control
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the means for the JU responsible for relay control to assign and deassign the paired slot radio relay function to a terminal and to control the relay function parameter.
|-
|-
|J0.5
|J0.5
| style="font-weight:normal;" | Repromulgation Relay
| style="font-weight:normal;" |Repromulgation Relay
| style="font-weight:normal;" |
| style="font-weight:normal;" |Requests that those messages in the same time slot containing the J0.5 message be relayed by all JUs receiving the message.
|-
|-
|J0.6
|J0.6
| style="font-weight:normal;" | Comm Control
| style="font-weight:normal;" |Comm Control
| style="font-weight:normal;" |
| style="font-weight:normal;" |Initiate or terminates specific transmissions to control communications, and requests network management actions.
|-
|-
|J0.7
|J0.7
| style="font-weight:normal;" | TSR Announcement
| style="font-weight:normal;" |TSR Announcement
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the capability for a JU to request a percentage of time slots from a shared pool and disseminate the requests of other JUs.
|-
|-
|J1.0
|J1.0
| style="font-weight:normal;" | Connectivity Interrogation
| style="font-weight:normal;" |Connectivity Interrogation
| style="font-weight:normal;" |
| style="font-weight:normal;" |Solicits direct or indirect connectivity of the addressed JUs to support route establishment.
|-
|-
|J1.1
|J1.1
| style="font-weight:normal;" | Connectivity Status
| style="font-weight:normal;" |Connectivity Status
| style="font-weight:normal;" |
| style="font-weight:normal;" |Disseminates direct or multilevel connectivity of the source JUs.
|-
|-
|J1.2
|J1.2
| style="font-weight:normal;" | Route Establishment
| style="font-weight:normal;" | Route Establishment
| style="font-weight:normal;" |
| style="font-weight:normal;" |Establishes a route for relay/destination control.
|-
|-
|J1.3
|J1.3
| style="font-weight:normal;" | Acknowledgment
| style="font-weight:normal;" |Acknowledgment
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used by a JU involved in ground-to-ground communications to respond to messages that require machine receipt/compliance.
|-
|-
|J1.4
|J1.4
| style="font-weight:normal;" | Communication Status
| style="font-weight:normal;" |Communication Status
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used by JUs to report the connectivity quality of its direct communicants to Net Control Station (NCS) and other direct communicants.
|-
|-
|J1.5
|J1.5
| style="font-weight:normal;" | Net Control Initialization
| style="font-weight:normal;" | Net Control Initialization
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides a number of initial terminal parameters required to allow a terminal to actively participate in an established net under the control of a dynamic net manager
|-
|-
|J1.6
|J1.6  
| style="font-weight:normal;" | Needline PG Assignment
| style="font-weight:normal;" |Needline PG Assignment
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used by the designated NCS to assign an addressed JU its associated destination Source Track Numbers (STNs) with Participation Group (PG) numbers to form Needline PGs.
|-
|-
|J2.0
|J2.0
| rowspan="6" style="text-align:center;" |Precise Participation Location & Identification (PPLI)
| rowspan="6" style="text-align:center;" |Precise Participation Location & Identification (PPLI)  
| style="font-weight:normal;" | Indirect Interface Unit PPLI
| style="font-weight:normal;" |Indirect Interface Unit PPLI
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides Participating Unit/Reporting Unit/Generic Unit information on the Link 16 network when network participation status, identification, and positional information is forwarded from Link 11/11B.
|-
|-
|J2.2
|J2.2
| style="font-weight:normal;" | Air PPLI
| style="font-weight:normal;" |Air PPLI
| style="font-weight:normal;" | Transmitted by Link 16 air participants that provides network participation status, identification, positional information, and relative navigation information. This message can include the voice call sign, position (latitude/longitude), altitude, course, IFF codes, air platform type (generic - fighter, bomber, attack, etc.), air platform activity (engaging, investigating, etc.), etc.
| style="font-weight:normal;" |Provides all JUs information about airborne JUs on the Link 16 network. It is used by airborne JUs to provide network participation status, identification, positional information, and relative navigation information.
|-
|-
|J2.3
| J2.3
| style="font-weight:normal;" | Surface (Maritime) PPLI
| style="font-weight:normal;" |Surface (Maritime) PPLI
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides all JUs information about surface JUs on the Link 16 network. It is used by surface JUs to provide network participation and relative navigation information.
|-
|-
|J2.4
|J2.4
| style="font-weight:normal;" | Subsurface (Maritime) PPLI
| style="font-weight:normal;" |Subsurface (Maritime) PPLI
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides all JUs information about subsurface JUs on the Link 16 network. It is used by subsurface JUs to provide network participation status, identification, positional information, and relative navigation information.
|-
|-
|J2.5
|J2.5
| style="font-weight:normal;" | Land (Ground) Point PPLI
| style="font-weight:normal;" |Land (Ground) Point PPLI
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides all JUs information about stationary ground JUs on the Link 16 network. It is used by stationary ground JUs to provide network participation status, identification, positional information, and relative navigation information.
|-
|-
|J2.6
| J2.6
| style="font-weight:normal;" | Land (Ground) Track PPLI
| style="font-weight:normal;" |Land (Ground) Track PPLI
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides all JUs information about mobile ground JUs on the Link 16 network. It is used by mobile ground JUs to provide positional information, and relative navigation information.
|-
|-
|J3.0
|J3.0
| rowspan="8" style="text-align:center;" |Surveillance
| rowspan="8" style="text-align:center;" |Surveillance
| style="font-weight:normal;" | Reference Point
| style="font-weight:normal;" |Reference Point
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to exchange tactical information about geographic references.
|-
|-
|J3.1
|J3.1
| style="font-weight:normal;" | Emergency Point
| style="font-weight:normal;" |Emergency Point
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the location and type of an emergency that requires search and rescue.
|-
|-
|J3.2
|J3.2  
| style="font-weight:normal;" | Air Track
| style="font-weight:normal;" |Air Track
| style="font-weight:normal;" | This message is used to exchange information on air tracks. The message is primarily transmitted by a command and control agency. The message includes exercise (exercise messages are filtered out)/nonexercise tracks, track number, strength, position, speed, course, identity (pending, unknown, assumed friend, friend, neutral, suspect, hostile, or undefined), IFF codes, air platform type (generic - fighter, bomber, attack, etc.), air platform activity (engaging, investigating, etc.), air specific type (F-15, F-16, Mig-29, etc.), etc.
| style="font-weight:normal;" |Used to exchange information on air tracks.
|-
|-
|J3.3
|J3.3
| style="font-weight:normal;" | Surface (Maritime)
| style="font-weight:normal;" |Surface (Maritime)
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to exchange information on surface tracks.
|-
|-
|J3.4
|J3.4
| style="font-weight:normal;" | Subsurface (Maritime) Track
| style="font-weight:normal;" |Subsurface (Maritime) Track
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to exchange information on subsurface tracks and Datums.
|-
|-
|J3.5
|J3.5
| style="font-weight:normal;" | Land (Ground) Point/Track
| style="font-weight:normal;" |Land (Ground) Point/Track
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to exchange tactical surveillance information on land points and tracks.
|-
|-
|J3.6
|J3.6
| style="font-weight:normal;" | Space Track
| style="font-weight:normal;" |Space Track
| style="font-weight:normal;" |
| style="font-weight:normal;" |Exchanges information on Space and Ballistic Missile tracks.
|-
|-
|J3.7
|J3.7
| style="font-weight:normal;" | Electronic Warfare Product Information
| style="font-weight:normal;" |Electronic Warfare Product Information
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the means to exchange tactically significant information that has been derived from electromagnetic sources.
|-
|-
|J5.4
|J5.4
| style="text-align:center;" |Anti Submarine Warfare
| style="text-align:center;" |Anti Submarine Warfare
| style="font-weight:normal;" | Acoustic Bearing/Range
| style="font-weight:normal;" |Acoustic Bearing/Range
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to report acoustic bearing and range of subsurface contacts.
|-
|-
|J6.0
|J6.0
| style="text-align:center;" |Intelligence
| style="text-align:center;" |Intelligence  
| style="font-weight:normal;" | Intelligence Information
| style="font-weight:normal;" |Intelligence Information
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the means to exchange tactically significant information that has been derived from electromagnetic sources.
|-
|-
|J7.0
|J7.0
| rowspan="10" style="text-align:center;" |Track Management
| rowspan="10" style="text-align:center;" |Track Management
| style="font-weight:normal;" | Track Management
| style="font-weight:normal;" |Track Management
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to transmit information necessary to effect management actions on tracks being reported within the interface. Management actions include dropping tracks, reporting environment/category and identity conflicts, changing environment/category and identity, changing alert status, and changing strength.
|-
|-
|J7.1
|J7.1
| style="font-weight:normal;" | Data Update Request
| style="font-weight:normal;" |Data Update Request
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to request tactical information that has been locally generated by units participating within the interface.
|-
|-
|J7.2
|J7.2
| style="font-weight:normal;" | Correlation
| style="font-weight:normal;" |Correlation
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to resolve a dual designation problem by identifying one track to be retained and another to be dropped.
|-
|-
|J7.3
|J7.3
| style="font-weight:normal;" | Pointer
| style="font-weight:normal;" |Pointer
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to transmit a geographic position to an addressed unit within the interface.
|-
|-
|J7.4
|J7.4
| style="font-weight:normal;" | Track Identifier
| style="font-weight:normal;" |Track Identifier
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to transmit special identification numbers associated with the reference track number (TN).
|-
|-
|J7.5
|J7.5
| style="font-weight:normal;" | IFF/SIF Management
| style="font-weight:normal;" |IFF/SIF Management
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to transmit Identification Friend or Foe/Selective Identification Feature (IFF/SIF) information or a special code on a referenced track. Provisions are available to obtain the most current information by exchanging, clearing, or updating IFF/SIF data between units within the interface.
|-
|-
|J7.6
|J7.6
| style="font-weight:normal;" | Filter Management
| style="font-weight:normal;" |Filter Management
| style="font-weight:normal;" |
| style="font-weight:normal;" |For foreign agency use
|-
|-
|J7.7
|J7.7
| style="font-weight:normal;" | Association
| style="font-weight:normal;" |Association
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to transmit information, on two or more TNs, that has been automatically or manually associated when the information is deemed to pertain to the same contact. When a determination is made that the relationship above no longer exists, there is a provision for terminating this information association.
|-
|-
|J8.0
|J8.0
| style="font-weight:normal;" | Unit Designator
| style="font-weight:normal;" |Unit Designator
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to transmit to a terminal (from its NCS) the unit designator associated with the TNs in the terminal’s Participation Group assignments. The message will also be used to inform an NCS of a terminal’s unit designator.
|-
|-
|J8.1
|J8.1
| style="font-weight:normal;" | Mission Correlation Change
| style="font-weight:normal;" |Mission Correlation Change
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to add, delete, or change Mission Correlators on a specific aircraft or flight of aircraft.
|-
|-
|J9.0
|J9.0
| rowspan="6" style="text-align:center;" |Weapons Coordination & Management
| rowspan="9" style="text-align:center;" |Weapons Coordination & Management
| style="font-weight:normal;" | Command
| style="font-weight:normal;" |Command
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the means to transmit threat warning conditions, alert states, and weapons condition orders, to direct weapon system engagement for air defense and air support, and to direct Anti-Submarine Warfare (ASW) operations.
|-
|-
|J9.1
|J9.1
| style="font-weight:normal;" | Engagement Coordination
| style="font-weight:normal;" |Engagement Coordination
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the means for two or more elements to coordinate engagement, to conduct more efficient engagement, and to reduce the probability of wasted resources.
|-
|-
|J10.2
|J10.2
| style="font-weight:normal;" | ECCM Coordination
| style="font-weight:normal;" |ECCM Coordination
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the status of an engagement between the Reference TN and the Target TN.
|-
|-
|J10.3
|J10.3
| style="font-weight:normal;" | Handover
| style="font-weight:normal;" |Handover
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to transfer control of aircraft and remotely piloted vehicles/missiles between controlling units.
|-
|-
|J10.5
|J10.5
| style="font-weight:normal;" | Controlling Unit Report
| style="font-weight:normal;" |Controlling Unit Report
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to identify the JU that is controlling the track and to provide the Mission Correlator and/or voice call sign.
|-
|-
|J10.6
|J10.6
| style="font-weight:normal;" | Pairing
| style="font-weight:normal;" |Pairing
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides a means to indicate a pairing (not engagement status) between a friendly track and another track or point
|-
|J11.0
| style="font-weight:normal;" |Weapon Response/Status (1)
| style="font-weight:normal;" |Provides weapon compliance responses to controller directives.
|-
|J11.1
| style="font-weight:normal;" |Weapon Directives (1)
| style="font-weight:normal;" |Provides controller directives to a weapon.
|-
|J11.2
| style="font-weight:normal;" |Weapon Coordination (1)
| style="font-weight:normal;" |Used to coordinate the transfer of control authority and the delegation of third party source.
|-
|-
|J12.0
|J12.0
| rowspan="8" style="text-align:center;" |Control
| rowspan="8" style="text-align:center;" |Control
| style="font-weight:normal;" | Mission Assignment
| style="font-weight:normal;" |Mission Assignment
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used by C2 JUs and optionally by nonC2 JUs to assign missions, designate targets, and provide target information to nonC2 platforms. NonC2 JU acknowledgement of this message is through Receipt/Compliance (R/C) action.
|-
|-
|J12.1
|J12.1
| style="font-weight:normal;" | Vector
| style="font-weight:normal;" |Vector
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used by C2 JUs to send vector information and vector discretes specifically to air units operating on its net. Vectors are given for interception of air targets, navigation, and air traffic control.
|-
|-
|J12.2
|J12.2
| style="font-weight:normal;" | Precision AC Direction
| style="font-weight:normal;" |Precision AC Direction
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used by controlling units for operations requiring precise control positioning of mission aircraft (for example, ground-directed release of ordinance, automatic carrier landing operations, etc.)
|-
|-
|J12.3
|J12.3
| style="font-weight:normal;" | Flight Path
| style="font-weight:normal;" |Flight Path
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used by controlling units to provide air units with multiple-leg flight path information.
|-
|-
|J12.4
|J12.4
| style="font-weight:normal;" | Controlling Unit Change
| style="font-weight:normal;" |Controlling Unit Change
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to provide new control agency information to an aircraft prior to handoff to the new control agency. It is also used by a tactical aircraft to initiate control procedures with a new controlling unit or to effect a change of controlling unit in response to a Controlling Unit Change (CUC) Order or by a C2 JU to initiate control by own unit.
|-
|-
|J12.5
|J12.5
| style="font-weight:normal;" | Target/Track Correlation
| style="font-weight:normal;" |Target/Track Correlation
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used by controlling C2 JUs to:
 
* Correlate a target and a track,
* Decorrelate a target and a track, and
* Correlate multiple targets with a track.
|-
|-
|J12.6
|J12.6
| style="font-weight:normal;" | Target Sorting
| style="font-weight:normal;" |Target Sorting
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to:
 
* Enable nonC2 JUs to exchange targets and targeting information among themselves,
* Pass sensor data to C2 JUs and among nonC2 JUs,
* Pass nonC2 JU engagement status information between nonC2
 
JUs and from nonC2 JUs to C2 JUs, and;
 
* Provide control among nonC2 JUs.
|-
|-
|J12.7
|J12.7
| style="font-weight:normal;" | Target Bearing
| style="font-weight:normal;" |Target Bearing
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used by nonC2 JUs to:
 
* Exchange target reports using polar coordinates, and may include
 
range, bearing, elevation, rate, and uncertainty data, and;
 
* Pass sensor data to JUs.
|-
|-
|J13.0
|J13.0
| rowspan="5" style="text-align:center;" |Platform & System Status
| rowspan="5" style="text-align:center;" |Platform & System Status
| style="font-weight:normal;" | Airfield Status
| style="font-weight:normal;" |Airfield Status
| style="font-weight:normal;" |
| style="font-weight:normal;" |Reports operational status of airfields, runways, airfield facilities, and aircraft carrier flight decks.
|-
|-
|J13.2
|J13.2
| style="font-weight:normal;" | Air Platform Status
| style="font-weight:normal;" |Air Platform Status
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the current status of an air platform including ordnance load, fuel, operational status, and on-board systems’ status.
|-
|-
|J13.3
|J13.3
| style="font-weight:normal;" | Surface Platform Status
| style="font-weight:normal;" |Surface Platform Status
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the current status of a surface platform including ordnance load, operational status and on-board systems’ status.
|-
|-
|J13.4
|J13.4
| style="font-weight:normal;" | Subsurface Platform Status
| style="font-weight:normal;" |Subsurface Platform Status
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the current status of a subsurface platform to include operational status and on-board systems’ status.
|-
|-
|J13.5
|J13.5
| style="font-weight:normal;" | Land Platform Status
| style="font-weight:normal;" |Land Platform Status
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the current operational weapons and equipment status of a land platform.
|-
|-
|J14.0
|J14.0
| rowspan="2" style="text-align:center;" |Electronic Warfare
| rowspan="2" style="text-align:center;" |Electronic Warfare
| style="font-weight:normal;" | EW Parametric
| style="font-weight:normal;" |EW Parametric
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the means to exchange parametric information that has been derived from electromagnetic sources.
|-
|-
|J14.2
|J14.2
| style="font-weight:normal;" | EW Coordination & Control
| style="font-weight:normal;" |EW Coordination & Control
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the means for Electronic Warfare (EW) participants to coordinate EW activities among themselves.
|-
|-
|J15.0
|J15.0
| rowspan="3" style="text-align:center;" |Threat Warning
| rowspan="3" style="text-align:center;" |Threat Warning
| style="font-weight:normal;" | Threat Warning
| style="font-weight:normal;" |Threat Warning
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the capability for threat warning to targeted friendly platforms, including Threat Type, Threat Posture, Position/Relative Position, Altitude, and Speed.
|-
|-
|J16.0
|J16.0
| style="font-weight:normal;" | Imagery
| style="font-weight:normal;" |Imagery
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the capability to transmit and receive imagery.
|-
|-
|J17.0
|J17.0
| style="font-weight:normal;" | Weather over target
| style="font-weight:normal;" |Weather over target
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the current weather conditions over a target area.
|-
|-
|J28.0
|J28.0
| rowspan="8" style="text-align:center;" |National Use
| rowspan="8" style="text-align:center;" |National Use
| style="font-weight:normal;" | US National 1-Army
| style="font-weight:normal;" |US National 1-Army
| style="font-weight:normal;" |
| style="font-weight:normal;" |Purpose is defined by country and service of user.
|-
|-
|J28.1
|J28.1
| style="font-weight:normal;" | US National 2-Navy
| style="font-weight:normal;" |US National 2-Navy
| style="font-weight:normal;" |
| style="font-weight:normal;" |Purpose is defined by country and service of user.
|-
|-
|J28.2
|J28.2
| style="font-weight:normal;" | US National 3-USAF
| style="font-weight:normal;" |US National 3-USAF
| style="font-weight:normal;" |
| style="font-weight:normal;" |Purpose is defined by country and service of user.
|-
|-
|J28.3
|J28.3
| style="font-weight:normal;" | US National 4-USMC
| style="font-weight:normal;" |US National 4-USMC
| style="font-weight:normal;" |
| style="font-weight:normal;" |Purpose is defined by country and service of user.
|-
|-
|J28.4
|J28.4
| style="font-weight:normal;" | FR National 1
| style="font-weight:normal;" |FR National 1
| style="font-weight:normal;" |
| style="font-weight:normal;" |Purpose is defined by country and service of user.
|-
|-
|J28.5
|J28.5
| style="font-weight:normal;" | FR National 2
| style="font-weight:normal;" |FR National 2
| style="font-weight:normal;" |
| style="font-weight:normal;" |Purpose is defined by country and service of user.
|-
|-
|J28.6
|J28.6
| style="font-weight:normal;" | US National 5-NSA
| style="font-weight:normal;" |US National 5-NSA
| style="font-weight:normal;" |
| style="font-weight:normal;" |Purpose is defined by country and service of user.
|-
|-
|J28.7
|J28.7
| style="font-weight:normal;" | UK National 1
| style="font-weight:normal;" |UK National 1
| style="font-weight:normal;" |
| style="font-weight:normal;" |Purpose is defined by country and service of user.
|-
|-
|J31.0
|J31.0
| rowspan="3" style="text-align:center;" |Miscellaneous
| rowspan="3" style="text-align:center;" |Miscellaneous
| style="font-weight:normal;" | OTAR Management
| style="font-weight:normal;" |OTAR Management
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to exchange cryptonet management information for rekeying the KGV-8.
|-
|-
|J31.1
|J31.1
| style="font-weight:normal;" | OTAR
| style="font-weight:normal;" |OTAR
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to transmit the new cryptovariables.
|-
|-
|J31.7
|J31.7
| style="font-weight:normal;" | No Statement
| style="font-weight:normal;" |No Statement
| style="font-weight:normal;" |
| style="font-weight:normal;" |Used to fill out the remainder of a transmission opportunity when the messages to be transmitted do not require the full number of Reed�Solomon code words.
|-
|-
|RTT-A
|RTT-A
| rowspan="3" style="text-align:center;" |Round Trip Timing
| rowspan="3" style="text-align:center;" |Round Trip Timing
| style="font-weight:normal;" | RTT Addressed
| style="font-weight:normal;" |RTT Addressed
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the means for a terminal to synchronize with system time using the active synchronization procedure. A specific terminal is interrogated and responds with the RTT Reply.
|-
|-
|RTT-B
|RTT-B
| style="font-weight:normal;" | RTT Broadcast
| style="font-weight:normal;" |RTT Broadcast
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the means for a terminal to synchronize with system time using the active synchronization procedure. The RTT-B is not addressed to any particular terminal. Any terminal that meets the specified requirement for time quality level responds with the RTT Reply.
|-
|-
|RTT-REP
|RTT-REP
| style="font-weight:normal;" | RTT Reply
| style="font-weight:normal;" |RTT Reply
| style="font-weight:normal;" |
| style="font-weight:normal;" |Provides the means for a terminal to support the active synchronization procedure of another JU by providing time-of-arrival data in response to either an RTT-A or RTT-B Interrogation.
|}
|}


==Notes==
==Notes==
<references />
<references />
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