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1 National Transportation Communications for ITS Protocol.

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Presentation on theme: "1 National Transportation Communications for ITS Protocol."— Presentation transcript:

1 1 National Transportation Communications for ITS Protocol

2 2 National Architecture & NTCIP NTCIP Center-to-Field NTCIP Center-to-Center

3 3 Message Set Standards Message Communications Standards Data Element Data Element Standards Data Element ITS Standards Perspective

4 4 Data Elements Standards 1.Traffic Management Data Dictionary (TMDD) 2.NTCIP- Data Dictionary for Each Device 3.TCIP- Data Dictionary for each Transit Application 1.Traffic Management Data Dictionary (TMDD) 2.NTCIP- Data Dictionary for Each Device 3.TCIP- Data Dictionary for each Transit Application

5 5 Message Sets Standards 4.Message Sets for E xternal T MC C ommunications (MS/ETMCC) 5. Message Sets for Incident Management 4.Message Sets for E xternal T MC C ommunications (MS/ETMCC) 5. Message Sets for Incident Management

6 6 Communications Protocol Standards 6.Center to Field Communications Protocols 7.Center to Center Communications Protocols DATEX-ASN ; CORBA 6.Center to Field Communications Protocols 7.Center to Center Communications Protocols DATEX-ASN ; CORBA

7 7 Message Set Standards External TMC (ITE) Incident management (IEEE) ATIS (SAE) ITS Derived Standards Message Data Element Data Element Standards TMDD (ITE) NTCIP (AASHTO, ITE, NEMA) Object definitions for traffic signals, message signs, transit (a.k.a. TCIP) ATIS (SAE) Communications Standards IP, HDLC framing (NTCIP effort) DSRC (ASTM) NTCIP Class B (NTCIP) TMC Center, roadside, traveler, vehicle subsystems Data Element

8 8 Message Set Standards Data Element Standards Communications Standards TMDD Section 3 - Traffic Control NTCIP NEMA TS 3.4 - Global NTCIP NEMA TS 3.5 - ASC Message Sets for External Traffic Management Center Communications (MS/ETMC2) Traffic Controller Standards Topics Class B SP-PPP TP-Internet AP-STMF Class D Profile

9 9 Message Set Standards Data Element Standards Communications Standards TMDD Section 3 - Traffic Control NTCIP NEMA TS 3.4 - Global NTCIP NEMA TS 3.6 - DMS Message Sets for External Traffic Management Center Communications (MS/ETMC2) DMS Standards Topics SP-PPP TP-Internet AP-STMF Class D Profile

10 10 Building Blocks From International Standards Organization ISO – Language to Define Data Elements : ASN.1

11 11 Building Blocks From The Internet Authority 2. Rules ( Protocols) to Transport Data Elements – SNMP, TCP/IP, UDP etc.

12 12 Open System Interconnect- Reference Model OSI-RM Each layer independently performs a specific task Application Session Transport Physical Link Network Presentation message data stream bits data frames segments dialog connection API network address packets

13 13 Off-the-Shelf Protocols Examples Application Session Transport Physical Link Network Presentation SNMP RS 232 PPP UDP IP HDLC

14 14 First NTCIP Objective is : Develop Data Dictionaries & Communications Protocols System USER Work Station Communications Profiles

15 15 System Second NTCIP Objective is : Develop Communications Protocols for Center to Center Information Exchange System Communications Protocols

16 16 28 Devices 2 dynObjDef 1 dynObjData 2 protocols 1 layers 1 profiles 2 dynObjMgmt 3 Class B 1 rs232Async 2 rs232 1 hdlc 3 snmp 5 trans 4 system 6 asc 1 ramp 2 dms 3 camera 4 sensors 5 global 6 NEMA 1206 private 3 transportat ion 4 experiment al 2 mgmt 1 NTCIP Standards Organization 1 2 Protocols Dictionaries

17 Twisted Pair UDPTCP IP Null Subnetwork Information Transport Application Information Subnetwork Dynamic Objects Reference Model Files Data Objects ITS Message Sets SLIPPPPPMPPFDDIEthernet ATM SONET V Series ModemFSK Modem Plant * * Not all Subnetwork / Plant combinations are feasible NTCIP Standards Framework Fiber CoaxTelco LineWireless FTP TFTP SNMPSTMPCORBADATEX Application Center-to-Center Center-to-Field ITS Data Model ITS Data Dictionary

18 Topic- 2 NTCIP Roadmap An Analogy that Describes the Mechanics of NTCIP

19 NTCIP Roadmap Analogy Cardiology History Street Address Completion of a medical history form that uses a dictionary of terms and mails the form to a medical professional for action.

20 #1 - Objects Are NTCIP Data Building Blocks 1 phaseWalkOBJECT-TYPE SYNTAXINTEGER (0..255) ACCESSread-write STATUSmandatory DESCRIPTION "Phase Walk Parameter in seconds (0-255 sec). This shall control the amount of time the Walk indication shall be displayed. " ::= { phaseEntry 8 } Word Definition \ def- -nish- n\ n: a word or phrase expressing the essential nature of a person or thing. ee Definitions are structured with syllabic spelling, pronunciation, grammatical usage, definition, etc. NTCIP data elements are defined for transmission using ASN.1 structure and are called objects. Object NTCIP Speak Analogy

21 #2 - NTCIP Data are Hierarchically Organized Alphabet Organizes definitions in an alphabetical structure. 2 Organizes objects in a hierarchical structure. ISO Tree A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ISO, 1 Organization, 3 ISO-CCITT, 2 Country, 16 USA, 640 Organization, 1 DOD, 6 Internet, 1 Private, 4 Enterprises, 1 NEMA, 1206 ROOT NTCIP Speak Analogy

22 NTCIP Speak Analogy #3 - Device Standards are Subject Matter Dictionaries Collections of definitions in alphabetical structure for subjects. Subject Matter Dictionaries Collections of objects in hierarchical structure for subjects. NTCIP Standards 3 Dermatology Psychiatry Cardiology TS 3.4 TS 3.5 TS 3.6 TS 3.7

23 #4 - Object Subset Needed for Application NTCIP Speak Analogy 4 Words Needed for a Specific Use Subset of a subject area for a specific purpose. E.G., heart disease history uses only some medical terms. History Cardiology Management Information Base (MIB) Module MIB Module is a collection of objects for a specific application (agency specific). MIB for Signals in City A

24 #5 - Objects Are Written According To Procedures 5 NTCIP Speak Analogy A paper form might be the device on which we would write a heart disease history. Filling In a Form History 1.Print all responses. 2.Use a no. 2 pencil. 3.Answer parts 1 & 2 only. 4. Write from top to bottom, left to right. SNMP is a set of rules for reading and writing MIB objects to a device. Simple Network Management Protocol (SNMP) SNMP get set get-next trap MIB for Signals in City A

25 25 Example of Object: Number of Permanent Messages Parameter Page 2-14 TS 3.6 dmsNumPermanentMsg OBJECT-TYPE SYNTAX INTEGER(0...65535) ACCESS read-only STATUS mandatory DESCRIPTION Indicates the current number of Messages stored in non-volatile, nonchargeble memory( e.g. EPROM). For CMS and BOS, this number is the diffent messages that can be assembled. ::={dmsMessage 1} Both values are encoded as a pair Note: OID is only a references to data, it is not IP address OID location in the tree 1.3.6.1.4.1.1206.4.2.3.5.1 This is not a IP Address, only a IN number for data element

26 #6 - Objects Are Transmitted Using Rules 6 NTCIP Speak Analogy Mailing Rules To transmit the heart history form to a doctor, a patient follows a mailing systems rules. US postal service rules. Open System Interconnect (OSI) OSI 7 layer reference model (OSI-RM) has rules for transporting and processing the information. Data processing rules Data transport rules Application Presentation Session Transport Network Data Link Physical Physical network rules

27 #7 - Physical Layer Defines Media 7 NTCIP Speak Analogy The heart disease history info could be submitted on paper, on a disk, on a voice tape, etc. Media Choice ? History Defines how to get the bits across the connection (copper, fiberoptic, coaxial). Physical Media Choices Ethernet Sonet

28 #8 - Data Link Layer Defines Data Packages 8 NTCIP Speak Analogy Specifies the packaging rules used to transmit the information. Street Address Packaging History Describes the data package transmitted over a single link & checks for errors. High Level Data Link Control (HDLC) Frames MIB for Signals in City A FlagAddressControl Info FCSFlag

29 #9 - Network & Transport Layers Define Data Addressing and Delivery 9 NTCIP Speak Analogy Internet Protocol (IP) Network layer routes through interconnected network links using Internet compatible rules. Flag Address Control IPI InfoFCSFlag User Datagram Protocol (UDP) Transmission Control Protocol (TCP) Internet Protocol (IP) Addresses the mail. Names the person at the address & repackages into smaller packages if needed. Add Recipient Name User Name Address Return Receipt Required Town, State,Zip, Country

30 #10 - Top 3 Layers Perform Data Processing 10 NTCIP Speak Analogy Read the heart disease history form and provide info for physician to act. Reading the Form History SNMP get set get-next trap SNMP reads & writes MIB objects that have been transmitted using OSI-RM. Simple Network Management Protocol (SNMP)

31 31 Roadmap Summary - The Data Data elements are called objects and defined using a structure called ASN.1. Dictionaries of objects for specific applications are arranged by an ISO hierarchy instead of by alphabet. The subset of objects needed by an agency is collected into a database called a MIB. The procedure for reading and writing this database is termed SNMP. A more efficient version called STMP is applicable in many transportation applications.

32 32 Roadmap Summary - Moving the Data The rules for transmitting the data follow the OSI reference model. Data is packaged into HDLC frames. Data packages are moved through communications networks using rules compatible with the Internet Protocols.

33 Topic-3 Center to Field (Device Level) Communications Profiles

34 Twisted Pair UDPTCP IP Null Subnetwork Information Transport Application Information Subnetwork Dynamic Objects Reference Model Files Data Objects ITS Message Sets SLIPPPPPMPPFDDIEthernet ATM SONET V Series ModemFSK Modem Plant * * Not all Subnetwork / Plant combinations are feasible NTCIP Standards Framework Fiber CoaxTelco LineWireless FTP TFTP SNMPSTMPCORBADATEX Application Center-to-Center Center-to-Field ITS Data Model ITS Data Dictionary

35 35 NTCIP Overview SNMP Objects Dynamic Objs STMP IP NULL PMPP PPP FSK RS-232 UDP SNMP Cable Air Phone TWP RS-232 Modem Radio

36 36 Use of Existing Standards Why does the NTCIP re-define all of these standards? –There are unique requirements within the transportation environment There are options that are not appropriate for our environment There are features that our environment requires that are not defined in existing standards

37 37 ISO - NTCIP Relationship Application Presentation Session Transport Network Data Link Physical Information Level Application Level Transport Level Subnetwork Level Class Level Plant Level ISONTCIP

38 38 Profiles A standard that further restricts the interpretation/use of other standards May specify how to combine multiple standards together into a standard package Primarily developed to promote interoperable implementations

39 39 Historic Class Profiles

40 40 Subnet Profiles Defines how data is physically transmitted across a link, including –Physical signals –Addressing –Bit error checking –Permission to speak –Multiplexing of Transport Profiles

41 41 Subnet Profiles PMPP232low-speed, multi-drop via 232 Others Under Development –Near-Term PMPP/FSKLow-speed, multi-drop, over twisted pair PPPDial-up EthernetLANs and other Ethernet systems –Long Term FDDIFiber systems SONETAnother fiber option Metropolitan Area NetworksEquivalent to a LAN

42 42 Transport Profiles Routing across a network –Logical to physical address mapping –Delivery times –Error handling Fragmentation and re-assembly Multiplexing of Application Profiles

43 43 Transport Profiles Transportation (Null)Low-speed connections InternetComputer industry standard –UDP/IP –TCP/IP

44 44 Application Profiles Defines structure for information exchange –Overall structure of each message –What information gets exchanged –Under what conditions can information be exchanged –Byte-level encoding formats

45 45 Application Profiles Field Communications –SNMPComputer industry standard –STMPLow-speed, high data exchange reqts Center-to-Center Communications –DATEX-ASNSimple structured solution based on messages –CORBAAdvanced object-oriented solution General Use –FTPStandard file transfer –TFTPSimple file transfer where TCP not available or frequent transfers


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