- AASHTO
- American Association of State Highway and Transportation Officials.
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- ANSI
- American National Standards Institute.
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- ASC
- Actuated Signal Controller
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- ASCII
- American Standard Code for Information Interchange.
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- ASN.1
- Abstract Syntax Notation One.
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- ATIS
- Advanced Traveler Information System.
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- ATMS
- Advanced Traffic Management System.
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- AVI
- Automatic Vehicle Identification.
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- AVL
- Automatic Vehicle Location.
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- BPS
- Bits per second.
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- CCITT
- Consultative Committee for International Telegraphy and Telephony, now know as ITU-T.
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- CCTV
- Closed-circuit television.
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- CLNS
- Connectionless-mode network service.
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- CLS
- Closed-loop system.
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- CONS
- Connection-oriented network service.
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- CORBA
- Common Object Request Broker Architecture
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- CRC
- Cyclical redundancy check.
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- DATEX-ASN
- DATa EXchange - Abstract Syntax Notation One Protocol
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- DCE
- Data Circuit Terminating Equipment.
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- DLSAP
- Data Link Service Access Point.
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- DLSDU
- Data Link Service Data Unit.
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- DMS
- Dynamic Message Sign
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- DTE
- Data Terminal Equipment.
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- DTR
- Data Terminal Ready.
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- EBCDIC
- Extended Binary Coded Decimal Interchange Code.
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- EIA
- Electronic Industries Associates.
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- ESS
- Environmental Sensor Station
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- FCS
- Frame Check Sequence (see Cyclic Redundancy Check).
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- FHWA
- Federal Highway Administration.
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- FSK
- Frequency Shift Keying.
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- FTP
- File Transfer Protocol.
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- GO
- Global Objects
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- HAR
- Highway Advisory Radio.
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- HDLC
- High-Level Data Link Control.
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- IAB
- Internet Activities Board.
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- IANA
- Internet Assigned Numbers Authority.
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- IEC
- International Electro-technical Commission.
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- IETF
- Internet Engineering Task Force.
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- IP
- Internet Protocol.
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- IPI
- Initial Protocol Identifier.
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- ISO
- International Organization for Standardization.
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- ISTEA
- Intermodal Surface Transportation Efficiency Act of 1991.
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- ITE
- Institute of Transportation Engineers.
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- ITIIS
- International Traveler Information Interchange Standard.
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- ITS
- Intelligent Transportation Systems.
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- ITU-T
- International Telecommunications Union, Telecommunications Sector.
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- LAN
- Local Area Network.
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- LCP
- Link Control Protocol
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- LLC
- Logical Link Control.
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- LSB
- Least Significant Bit.
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- MIB
- Management Information Base.
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- MSB
- Most Significant Bit.
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- NANA
- NTCIP Assigned Numbers Authority
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- NEMA
- National Electrical Manufacturers Association.
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- NSDU
- Network Service Data Unit.
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- NTCIP
- National Transportation Communication for ITS Protocol.
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- NVT
- Network Virtual Terminal.
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- OER
- Octet Encoding Rules
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- OET
- Outreach, Education, and Training
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- OMG
- Object Management Group
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- OSI
- Open Systems Interconnection.
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- PDU
- Protocol Data Unit.
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- PER
- Packed Encoding Rules.
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- PICS
- Protocol Implementation Conformance Statement.
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- PMPP
- Point-to-Multi Point Protocol.
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- PPP
- Point-to-Point Protocol.
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- pro forma
- (Latin) Provided in advance so as to specify form or to describe items.
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- RFC
- Request for Comments.
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- RM
- Ramp Meter
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- RM-OSI
- Reference Model OSI.
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- SAP
- Service Access Point.
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- SCP
- Signal Control and Prioritization
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- SDU
- Service Data Unit.
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- SMI
- Structure of Management Information.
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- SNMP
- Simple Network Management Protocol.
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- SNMPv2
- Simple Network Management Protocol version 2.
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- SSM
- Signal System Master
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- STMF
- Simple Transportation Management Framework
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- STMF
- Simple Transportation Management Framework.
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- STMI
- Structure and Identification of Transportation Management Information.
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- STMP
- Simple Transportation Management Protocol.
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- TCIP
- Transit Communications Interface Protocol.
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- TCP
- Transmission Control Protocol.
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- TCP/IP
- Transmission Control Protocol/Internet Protocol.
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- TEA-21
- 1998 Transportation Efficiency Act for the 21st Century
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- TIA
- Telecommunications Industries Association.
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- TLV
- Tag, Length, Value.
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- TMC
- Transportation Management Center.
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- TMIB
- Transportation MIB.
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- TMS
- Transportation Management Systems.
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- TOC
- Transportation Operation Center.
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- TSS
- Transportation Sensor System
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- UCC
- Unbalanced Connectionless Class.
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- UDP
- User Datagram Protocol.
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- UI
- Unnumbered Information (Frame).
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- VMS
- Variable Message Sign
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- WAN
- Wide Area Network.
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