Module 29 - A207b
A207b: Building an ITS Infrastructure Based on the Advanced Transportation Controller (ATC) 5201 Standard, Part 2 of 2
HTML of the Student Supplement
(Note: This document has been converted from the Student Supplement to 508-compliant HTML. The formatting has been adjusted for 508 compliance, but all the original text content is included, plus additional text descriptions for the images, photos and/or diagrams have been provided below.)
(Extended Text Description: Large graphic cover page with dark blue background with the title in white letters "A207b: Building an ITS Infrastructure Based on the Advanced Transportation Controller (ATC) 5201 Standard Part 2 of 2" At the middle left is the "Standards ITS Training" logo with a white box and letters in blue and green. The words "Student Supplement" and "RITA Intelligent Transportation Systems Joint Program Office" in white lettering are directly underneath the logo. Three light blue lines move diagonally across the middle of the blue background.)
A207b: Building an ITS Infrastructure Based on the Advanced Transportation Controller (ATC) 5201 Standard Part 2 of 2
Table of Contents
Introduction/Purpose - 2
Traffic Concepts - 2
Transportation Field Cabinet Systems (TFCSs) - 5
Glossary - 8
Reference to Other Standards - 12
References - 12
Study Questions - 13
A207b: Building an ITS Infrastructure Based on the Advanced Transportation Controller (ATC) 5201 Standard (Part 2 of 2) is the second of two modules of the Professional Capacity Building (PCB) program on using the Advanced Transportation Controller (ATC) 5201 Standard. A207b identifies the features of the ATC 5201 Standard, describes the architecture, describes how the standard works with other ITS standards, and helps users specify ATC equipment for procurements. This module provides the background information necessary to understand A208: Using the ATC 5401 Application Programming Interface Standard to Leverage ITS Infrastructures.
2. Traffic Concepts
Intersection Actuation - The extent at which an intersection is equipped for vehicle detection.
(Extended Text Description: This graphic consists of three graphics each representing a 4 way intersection. The intersection graphics are arranged such that two are evenly distributed across the page. The third intersection graphic is below the first two and aligned center on the page. Each graphic is depicted as two two-lane roads intersecting perpendicularly North/South and East/West in the shape of a cross (it is assumed that upward is north). There is a centerline on each road to differentiate the northbound lane from the southbound lane and the eastbound lane from the westbound lane. The area where the roads cross (center of the cross) is blank (no lines running through it). In the bottom graphic, the southbound, northbound, westbound, and eastbound approaches to the intersection contain rectangles extending across the width of the lane (total four lanes). The rectangles have one edge at the point where the blank center area begins and extends back into the lane about 1 ½ times their width. This graphic is labeled "Actuated." The graphic to the upper right has the rectangles on the southbound and northbound directions only. This graphic is labeled "Semi-Actuated." The graphic on the upper left does not contain any of the rectangles. This graphic is labeled "Non-Actuated.")
Cycle - The time required for one complete revolution of the timing dial (old definition). One complete sequence of signal indications.
Interval - Any one of the several divisions of the time cycle during which signals indications do not change. Examples:
Phase - Any combination of traffic movements receiving right-of-way simultaneously during one or more intervals
Overlap - A traffic movement timed concurrently with one or more phases (parent phases). Typically, the yellow and red clearance timing of the overlap is equal to that of the phase terminating the overlap.
Standard Quad or 8-Phase Intersection. The odd numbered phases represent left turn movements. The even numbered phases represent though movements. Overlaps are indicated by the plus signs and indicate that the right arrow would appear during the timing of the two phases indicated. Example: The overlap 08 + 01 would be allowed during the timing of 08 and 01. No U-turns on left arrow allowed.
(Extended Text Description: This is a graphic representing of a 4 way intersection. It is depicted as two four-lane roads intersecting perpendicularly North/South and East/West in the shape of a large cross (it is assumed that upward is north). There is a center median about the same width as the lanes on each road to differentiate the northbound lanes from the southbound lanes and the eastbound lanes from the westbound lanes. On each side of the median are parallel dotted lines to identify the two lanes on each side. The area where the roads cross (center of the cross) is blank (no lines running through it). For each of the southbound, northbound, westbound, and eastbound approaches to the intersection, the center medians narrow to provide an additional left turn lane for each approach (total 4). The straight through lanes and adjacent left turn lanes on each approach are separated by a dotted line. Each approach has its lanes identified as described below:
Ring - Consists of two or more sequentially timed and individually selected conflicting phases so arranged as to occur in an established order.
Barrier - A reference point in the preferred sequence of a multi-ring controller at which all rings are interlocked. Barriers assure there will be no concurrent selection and timing of conflicting phases for traffic movements in different rings. All rings cross the barrier simultaneously to select and time phases on the other side.
Concurrent Groups - All of the phases between two barriers. Typically, they are the left turn and through movements on a single street.
Dual Ring Operation for a Standard Quad - See diagram below. There are two rings. The first consists of phases 1-4 and the second consists of phases 5-8. A phase in Ring 1 can time with a phase in Ring 2 provided they are a part of the same concurrent group.
(Extended Text Description: This is a graphic representing the flow of service for each of the turning movements in a 4 way intersection. There are eight squares arranged in a two columns and four rows all evenly spaced. Above the left column of squares is a label "RING 1." Above the right column of squares is a label "RING 2." There is a dashed line extending vertically from between the labels to the bottom of the graphic. The dashed line is centered between the columns of squares. There is a horizontal dashed line extending across the graphic evenly between the second and third row of squares. The line is labeled "BARRIER." There is a second such dashed line and label extending across the graphic below the fourth row of squares. To the right of the graphic is a large right bracket highlighting the top four squares (above the first barrier line) with the label "CONCURRENT GROUP." To the right of the graphic is a large right bracket highlighting the bottom four squares (below the first barrier line) labeled "CONCURRENT GROUP."
Each square contains a number and an arrow. The left column of squares contains the following (top to bottom):
The right column of squares contains the following (top to bottom):
There are solid lines connecting the numbered squares as follows:
3. Transportation Field Cabinet Systems (TFCSs)
Field Architectures for Performing Traffic Management
(Extended Text Description: This is a graphic of 5x5 crisscrossing perpendicular lines representing a downtown "grid" of intersecting streets. The grid forms a 4x4 (rows and columns) representation of city blocks. In the bottom left side of each city block (except for the first block in the third row) is a TFCS (each TFCS is about 2/3 of the height of block. The leftmost TFCSs in row 3 and 4 have the abbreviation "FMS" above them (stands for Field Management Station). Left of the grid is a graphic of a building which represents a traffic management center (TMC).
The TFCSs are associated to different field architectures. Dotted lines are used to represent communications.
Evolution of Transportation Control Equipment
(Extended Text Description: This graphic contains a horizontal arrow that stretches almost the entire width of the slide near the bottom. There are years listed beneath the timeline (not evenly spaced) as follows: "1940s," "1976," "1980s," "1992," "1998," and "2006." Above the timeline are labeled photographs of TFCSs of different shapes and sizes as follows:
Basic Transportation Field Cabinet System Components
(Extended Text Description: This graphic illustrates that the field cabinet contains various equipment. There are two large graphics. The leftmost graphic is the aluminum looking cabinet. The cabinet has a door with a horizontal handle on the left side of the cabinet and two vent slots in the center top. The cabinet is about 2.5 times high as it is tall. Above it is the label "Housing." The graphic on the right is about twice the size of the cabinet on the left. It is an enlargement of the aluminum cabinet without a door and showing the contents of the cabinet. Inside the cabinet are six labeled cuboids that extend almost the width of the cabinet. They are evenly distributed vertically. Starting from the top the cuboids are labeled "Input," "Controller," "Outputs," "Monitoring," "Power Supply," and "Internal Bus." There is a large left bracket between the cabinet graphic on the left and the enlarged cabinet on the right emphasizing that the right graphic represents the contents of the cabinet on the left.)
Basic Transportation Field Cabinet System Operation
(Extended Text Description: On the upper right side of this graphic is the intersection graphic labeled "Actuated" as described in Section 2 Definition of "Intersection Actuation." In this case, the graphic is labeled "Field Sensors." In the lower right of the graphic is a graphic of a traffic signal mast arm. On the mast are three traffic signal heads. This graphic is labeled "Field Displays." On the left side of the slide are four cuboids each the same size and about 5 times wider than their height or depth. They are evenly spaced and aligned with each other. They are labeled top to bottom "Inputs, Controller, Outputs and Monitoring." There are arrows showing the flow of information through the TFCS. There is an arrow extending out of the top of the Field Sensors graphic into the Inputs cuboid. There is an arrow extending out of the bottom of the of the Inputs cuboid to the Controller cuboid. There is an arrow extending out of the Controller cuboid to the Outputs cuboid. There is an arrow extending out of the Outputs cuboid to the Monitoring cuboid. There is a double arrow extending from the left side of the Monitoring cuboid back up to the left side of the Controller cuboid. This line has a label associated with via a dotted line. The label says "Controller/Monitor Communications Used in NEMA TS 2 and ITS Cabinets." There is a line extending from the ride side of the Outputs cuboid to the top of the Field Displays graphic.)
Differences in Transportation Field Cabinet System
|TFCS||Physical Mounting||Internal Bus||Signal Monitor||Input Channels||Monitored Output Channels|
|NEMATS1||Shelf||Parallel / Discrete Wiring||Conflict Monitor||8||3/6/12/18|
|Caltrans Model 33X||Rack||Parallel / Discrete Wiring||Conflict Monitor||44||16/18|
|NEMATS 2||Shelf||Serial 153.6 kbps||Malfunction Management Unit||64||16|
|ITS Cabinet v01||Rack||Serial 614.4 kbps||Cabinet Monitor Unit||120||28|
|AASHTO||American Association of State Highway and Transportation Officials|
|AC-||120 VAC, 60 Hz neutral (grounded return to the power source)|
|AC+||120 VAC, 60 Hz line source (ungrounded)|
|ANSI||American National Standard Institute|
|ASCII||American Standard Code for Information Interchange|
|Assembly||A complete machine, structure, or unit of a machine that was manufactured by fitting together parts and/or modules|
|ASTM||American Society for Testing and Materials|
|ATC||Advanced Transportation Controller|
|AWG||American Wire Gage|
|BSP||Board Support Package|
|Cabinet||An outdoor enclosure generally housing the controller unit and associated equipment|
|Caltrans||California Department of Transportation|
|Component||Any electrical or electronic device|
|CPU||Central Processing Unit|
|CTS||Clear to send (data)|
|CU||Controller Unit, that portion of the controller assembly devoted to the operational control of the logic decisions programmed into the assembly|
|DAT||Design Acceptance Testing|
|DCD||Data Carrier Detect (receive line signal detector)|
|DRAM||Dynamic Random Access Memory|
|EEPROM||Electrically Erasable Programmable Read-Only Memory|
|EIA||Electronic Industries Association|
|EPROM||Ultraviolet Erasable, Programmable, Read-Only Memory|
|Equal||Connectors: comply to physical dimensions, contact material, plating and method of connection. Devices: comply to function, pin out, electrical and operating parameter requirements, access times and interface parameters of the specified device|
|ETL||Electrical Testing Laboratories, Inc.|
|FCU||Field Control Unit|
|Firmware||A computer program or software stored permanently in PROM, EPROM, ROM, or semi-permanently in EEPROM|
|FLASH||A form of EEPROM that allows multiple memory locations to be erased or written in one programming operation. It is solid-state, permanent and non-volatile memory typically having fast access and read/write cycles|
|FPA||Front Panel Assembly|
|FSK||Frequency Shift Keying|
|HDLC||High-level Data Link Control|
|IEEE||Institute of Electrical and Electronics Engineers|
|ISO||International Standards Organization|
|ITE||Institute of Transportation Engineers|
|ITS||Intelligent Transportation Systems|
|Jumper||A means of connecting/disconnecting two or more conductors by soldering/desoldering a conductive wire or by PCB post jumper|
|Keyed||Means by which like connectors can be physically altered to prevent improper insertion|
|LCD||Liquid Crystal Display|
|LED||Light Emitting Diode|
|LOGIC||Negative logic convention (Ground True) state|
|logic-level||HCT or equivalent TTL - compatible voltage interface levels|
|lsb||Least Significant Bit|
|LSB||Least Significant Byte|
|MIPS||Million Instructions Per Second|
|Module||A functional unit that plugs into an assembly|
|msb||Most Significant Bit|
|MS||Military Specification, Mil-Spec or Mil-Standard|
|MSB||Most Significant Byte|
|NA||Presently Not Assigned. Cannot be used by the contractor for other purposes.|
|NEMA||National Electrical Manufacturer's Association|
|NETA||National Electrical Testing Association, Inc.|
|NLSB||Next Least Significant Byte|
|NMSB||Next Most Significant Byte|
|NTCIP||National Transportation Communication for ITS Protocols|
|OST||Operating System Time|
|NYSDOT||New York State Department of Transportation|
|Open System||Standardized hardware interfaces in a module|
|PCB||Printed Circuit Board|
|PDA||Personal Data Assistant (electronic)|
|RAM||Random Access Memory|
|RMS||Root mean square|
|ROM||Read only memory|
|RTC||Real Time Clock|
|RTS||Request to send (data)|
|RX||Abbreviation for "Receive" when used to describe communication signals. Typically a prefix for other character(s).|
|SDLC||Synchronous Data Link Control|
|SPI||Serial Peripheral Interface|
|SRAM||Static Random Access Memory|
|TEES||Transportation Electrical Equipment Specifications|
|TMC||Transportation Management Center|
|TOD||Time Of Day Clock|
|TX||Abbreviation for "Transmit" when used to describe communication signals. Typically a prefix for other character(s).|
|UL||Underwriter's Laboratories, Inc.|
|USB||Universal Serial Bus|
|VAC||Volts Alternating Current|
|VDC||Volts Direct Current|
|WDT||Watchdog Timer: A monitoring circuit, external to the device watched, which senses an Output Line from the device and reacts|
5. Reference to Other Standards
7. Study Questions
Participant Questions Included in Presentation
1) Which of the following is NOT a purpose of the ATC standards program?
2) Which of the following is NOT a major feature of ATC controller units?
3) Which of the following is critical to being able to replace an Engine Board with a more powerful Engine Board in the future?
4) Which of the following ATC controller resources is NOT shared/managed by the API software?
5) Which of the following is a TRUE statement?
6) What is the best way to migrate to ATC equipment?
7) Which of the following is a good practice when preparing a specification using ATC 5201 v06?