Network Time Source --> Center:
time
Definitions
time (Information Flow): Current time expressed in Universal Time Coordinated (UTC) format from a Stratum-2 time server.
Network Time Source (Source Physical Object): The 'Network Time Source' represents the external time source the Connected Vehicle Service Monitor System uses as the basis for time. This is likely implemented as a Stratum-2 Network Time Server that is 2 steps removed from a basic time source (e.g., atomic clock).
Center (Destination Physical Object): This general physical object is used to model core capabilities that are common to any center.
Included In
This Triple is in the following Service Packages:
This triple is associated with the following Functional Objects:
This Triple is described by the following Functional View Data Flows:
This Triple has the following triple relationships:
None |
Communication Solutions
- NTP - UDP/IP (3)
Selected Solution
Solution Description
ITS Application Entity
No Standard Needed |
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Mgmt
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Facilities
No Standard Needed |
Security
(None) |
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TransNet
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Access
Internet Subnet Alternatives |
Note that some layers might have alternatives, in which case all of the gap icons associated with every alternative may be shown on the diagram, but the solution severity calculations (and resulting ordering of solutions) includes only the issues associated with the default (i.e., best, least severe) alternative.
Characteristics
Characteristic | Value |
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Time Context | Now |
Spatial Context | Adjacent |
Acknowledgement | False |
Cardinality | Unicast |
Initiator | Destination |
Authenticable | True |
Encrypt | False |
Interoperability | Description |
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National | This triple should be implemented consistently within the geopolitical region through which movement is essentially free (e.g., the United States, the European Union). |
Security
Information Flow Security | ||||
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Confidentiality | Integrity | Availability | ||
Rating | Not Applicable | High | Moderate | |
Basis | Time reference is intended to be univerally available. | Time must be highly coordinated for some applications. This support function must meet the highest requirement. | Time coordination must always be in place, but local mechanisms for tracking time should suffice to avoid catastrophic failures for known use cases, thus MODERATE. |
Security Characteristics | Value |
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Authenticable | True |
Encrypt | False |