Physical Object: Service Monitor System

SM Time Synchronization

Overview
Requirements
Information Flows
Standards

Overview

'SM Time Synchronization' provides the functions necessary to receive accurate time from an external Network Time Server and provide that Coordinated Universal Time (UTC) as Time Local Form to other center systems and field devices.

This functional object is included in the "Service Monitor System" physical object.

This functional object is included in the following service packages:

SU05: Location and Time

This functional object is mapped to the following Functional View PSpecs:

Requirements

#	Requirement
01	The service monitor system shall use the externally acquired time sync data to maintain its internal clocks.
02	The service monitor system shall provide time sync data to other Centers.
03	The service monitor system shall provide time sync data to Connected Vehicle Roadway Equipment.
04	The service monitor system shall provide time sync data to ITS Roadway Equipment.
05	The service monitor system shall acquire time sync data from an external Stratum-2 time source.

Information Flows

Source	Flow	Destination
Network Time Source	time	Service Monitor System
Service Monitor System	time local form	Center
Service Monitor System	time local form	Connected Vehicle Roadside Equipment
Service Monitor System	time local form	Data Distribution System
Service Monitor System	time local form	Field
Service Monitor System	service monitor information presentation	Service Monitor System Operator
Service Monitor System Operator	service monitor operator input	Service Monitor System

Standards

The following table lists the standards associated with the functional object itself (as opposed to standards associated with an interface).

Name	Title
NEMA TS 8 Cyber and Physical Security	Cyber and Physical Security for Intelligent Transportation Systems