Module 60 - A322b

A322b: Understanding Requirements for Transportation Field Cabinet Systems Using ATC 5301 v02

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A322b: Understanding Requirements for Transportation Field Cabinet Systems Using ATC 5301 v02

Table of Contents

Module Description - 2

Introduction/Purpose - 2

Samples/Examples - 3

Reference to Other Standards - 5

Glossary - 5

References - 7

Study Questions - 7

1. Module Description

This module is the second in a set of modules on the ATC 5301 ATC Cabinet Standard v02. It has the following recommended prerequisites in the ATC curriculum for students taking this course:

2. Introduction/Purpose

The Advanced Transportation Controller (ATC) family of standards provides an open architecture hardware and software platform that can support a wide variety of Intelligent Transportation Systems field applications including traffic management, safety, security, and other applications. These standards are characterized by their modularity, support of multiple and current application programs, and designed to facilitate the adoption of new technologies. There are three standards within the ATC program: the ATC 5201 ATC Standard, the ATC 5401 Application Programming Interface (API) Standard, and the ATC 5301 ATC Cabinet Standard.

The focus of this module is on the recently approved ATC 5301 ATC Cabinet Standard v02. This module builds on the previous module A322a. It describes the various assemblies and key components of an ATC Cabinet System. It helps students develop requirements based on user needs. The module shows how to combine the ConOps described in A322a with the requirements developed in A322b to create a specification for ATC Cabinets. It then demonstrates how to verify the specification.

At the conclusion of this module, students will be able to do the following:

  1. Describe the features of ATC 5301 Standard v02 transportation field cabinet systems;
  2. Write requirements for ATC Cabinet systems;
  3. Create a procurement specification for ATC Cabinets; and
  4. Verify the ATC Cabinet specification.

3. Samples/Examples

ADU Auxiliary Display Unit
ATC Advanced Transportation Controller
CMU Cabinet Monitor Unit
CPS Cabinet Power Supply
HDFU High Density Flasher Unit
HDSP High Density Switch Pack
SA Service Assembly
SIU Serial Interface Unit
SU Sensor Unit

Please see Extended Text Description below.

(Extended Text Description: Figure 1: Generic Representation of an ATC Cabinet System. This figure contains a small table of definitions and a graphic representation of an Advanced Transportation Controller (ATC) Cabinet system.

The graphic shows the interior of a cabinet system and its devices. The measurements below approximately represent the sizes they would be physically in an actual cabinet system.

The cabinet devices are arranged in a rack that has metal mounting "rails" on left and right sides of the cabinet. The rails are approximately 19 inches apart and extending the height of the cabinet. Each rail is approximately one inch in width. They are used to secure devices within the cabinet. There are 6 levels of devices in the cabinet system with little or no space between them. The heights of the levels are measured in Us where a U is 1.75 inches high.

At the first level (from the top) is a single rectangular device that extends from rail to rail and is approximately 5U in height. It has a screen and two keypads, a Light Emitting Diode (LED) that has the word "ACTIVE" below it. It has 7 miscellaneous connectors. It has a toggle switch in the lower right that has the label "AUX" next to it. It has "OFF" on top and "ON" below it. In large letters, on the right side of the device are large letters "ATC." This is and Advanced Transportation Controller. This device is colored blue to indicate that it is the "Controller" element of the cabinet system.

At the second level is a single rectangular device that extends from rail to rail and is approximately 1U in height. It has a screen on the right of the device and columns of 5 LEDs extending over 50% of the device starting on the left. Between the columns of LEDs and the screen are large letters "ADU." This is an Auxiliary Display Unit. This device is colored pink to indicate that it is part of the "Monitoring" element of the cabinet system.

At the third level is the input assembly that extends from rail to rail and is approximately 4U in height. It contains thirteen smaller rectangular devices that are approximately 1.5 inches in width and 4.5 inches in height. The leftmost device is labeled "SIU." The other twelve devices are labeled "SU." The SIU is colored violet to indicate that it is part of the "Internal Bus" element of the cabinet system. The SUs are colored aqua to indicate they are the "Inputs" element of the cabinet system.

At the fourth level is the output assembly that extends from rail to rail and is approximately 4U in height. It contains other devices. At the leftmost of the assembly, is a panel that is almost as tall as the assembly and about 4.5 inches wide. The panel contains what appear to be switches of various types. To the right of the panel is a smaller rectangular device that is approximately 2 inches in width and 4 inches in height. It is labeled "CMU." This is followed by nine other small rectangular devices that are approximately 1.5 inches in width and 4.5 inches in height. Eight of the devices are labeled "HDSP." The rightmost device is labeled "SIU." The CMU is colored pink to indicate that it is part of the "Monitoring" element of the cabinet system. The HDSPs are yellow to indicate the "Outputs" element of the cabinet system. The SIU is colored violet to indicate that it is a part of the "Internal Bus" element of the cabinet system.

At the fifth level is a single rectangular device that extends from rail to rail and is approximately 1U in height. It has assorted LEDs on the right side of the device. On the left side of the device is the label "CPS." This is the Cabinet Power Supply. The CPS is colored light grey to be representative of the "Power Supply" element of the cabinet system.

At the sixth level there are two different assemblies. The field termination assembly is a rectangular assembly that is attached toward the back of the cabinet. It appears to extend rail to rail and is 4U in height and has at least 8 columns of wiring terminators. There may be others terminators unseen. The service assembly is a rectangular assembly located in the front of the field termination assembly. It is attached to the right cabinet rail. It is approximately 5U in height and 5.5 inches wide. This assembly has what appear to be an assortment of switches, a standard power dual receptacle, and a small rectangular device that is approximately 1.5 inches in width and 4.5 inches in height. This device is labeled "HDFU." It is yellow to indicate that although it is located here, it is part of the "Outputs" element of the cabinet system.)

Figure 1. Generic Representation of an ATC Cabinet System

Please see Extended Text Description below.

(Extended Text Description: Figure 2: Systems Engineering Approach to Developing a Procurement Specification. This figure uses a graphic that illustrates the systems engineering process used to develop a specification. There are two circles evenly spaced in a descending fashion from left to right in the center of the slide representing processes. They contain the text "User Needs Dev" and "Reqmts Dev" representing user needs development and requirements development, respectively. There is a curved arrow extending from the user needs process to the requirements process. There is a curved arrow extending from the requirements process to the user needs process. There are three rectangular graphics with lines across them representing documents. The first document is located at the top of the slide and is labeled "Strategic and Regional Plans." It has a curved arrow extending from the document to the user needs process. There is a curved arrow extending from the user needs process to the second document located in the lower left of the slide that is labeled "Concept of Operations." There is a curved arrow extending from the requirements process to the third document located in the lower right of the slide that is labeled "Agency Specification." There are dotted double arrows extending between the first and second documents and between the second and third documents. The double arrows are labeled "Traceability." There are two stick figures labeled "Stakeholders" in the upper right of the slide. There is an arrow extending from the stick figures to the user needs process. There is another arrow extending from the stick figures to the requirements process.)

Figure 2. Systems Engineering Approach to Developing a Procurement Specification

4. Reference to Other Standards

5. Glossary

To include additional descriptions/acronyms used primarily in the module. List out in alphabetical order.

Term Definition
AASHTO American Association of State Highway and Transportation Officials
AC Alternating current
ADU Auxiliary Display Unit
ATC Advanced Transportation Controller
ATCC ATC Cabinet
CB Circuit breaker
CBD Central Business District
CMU Conflict Monitor Unit
CPS Cabinet Power Supply
ConOps Concept of Operations
DC Direct current
EMI Electromagnetic interference
FHWA Federal Highway Administration
ESD Electrostatic discharge
FTA Field Termination Assembly
GFI Ground fault interrupter
GFCI Ground fault circuit interrupter
HDFU High Density Flasher Unit
HDSP High Density Switch Pack
HDSP/FU High Density Switch Pack / Flasher Unit
IEEE Institute of Electrical and Electronics Engineers
IA Input Assembly
I/F Interface
I/O Input/output
IEC International Electrotechnical Commission
IMSA International Municipal Signal Association
IPC Formerly, the Institute for Printed Circuits. This same institution was later called the Institute Interconnecting and Packaging Electronic Circuits. It is now referred to as IPC-Association Connecting Electronics Industries.
ITE Institute of Transportation Engineers
ITS Intelligent Transportation System
JPO Joint Program Office
LED Light emitting diode
MTBF Mean time between failures
NEC National Electrical Code
NEMA National Electrical Manufacturers Association
NRTL Nationally Recognized Testing Lab
NTCIP National Transportation Communications for ITS Protocol
NFPA National Fire Protection Association
OA Output Assembly
PF Power factor
RFI Radio frequency interference
SA Service Assembly
SDO Standard Development Organization
SEMP System Engineering Management Plan
SEP Systems Engineering Process
SIU Serial Interface Unit
SSC Small-sized cabinet
StdRS Standards Requirements Specification
StdHLD Standards High Level Design
TFCS Transportation field cabinet system
SU Sensor Unit
UPS Uninterruptible power source
USA United States of America
USDOT United States Department of Transportation
VAC Voltage alternating current
VDC Voltage direct current
WG Working group

6. References

7. Study Questions

To include the quiz/poll questions and answer choices as presented in the PowerPoint slide to allow students to either follow along with the recording or refer to the quiz at a later date in the supplement. Do not indicate the correct/incorrect answers here.

1. Which of the following is a true statement?

  1. ATC 5301 defines a controller as part of the cabinet system
  2. ATC 5301 defines all mechanical specifications of each assembly
  3. Serial Interface Units are optional in ATC Cabinets
  4. Where there are defined options in ATC 5301, the agency specification should remove ambiguities

2. Which of the following would complete a well-formed requirement for our specification? The TFCS shall…

  1. Be weather resistant
  2. Certify conformance to the NEMA TS 2 Standard v06
  3. Utilize a Model 2220 Auxiliary Display Unit as defined by ATC 5301 v02
  4. All of the above

3. Which of the following is a correct statement?

  1. It’s best to use Warranty Requirements found ATC 5301
  2. Requirements are a major part of the ConOps
  3. Almost any part of the procurement process may have requirements in a procurement specification
  4. d) Most agencies create specifications with complete electrical, mechanical, and communications details

4. Which of the following is a true statement?

  1. The rationale of a user need should be examined for requirements
  2. Every user need must be addressed by at least two requirements
  3. It’s best to wait until the end of requirements development to start a traceability matrix
  4. All of the above

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