Module 59 - A322a

A322a: Understanding User Needs for Transportation Field Cabinet Systems Using ATC 5301 v02

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A322a: Understanding User Needs 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 - 9

Glossary - 9

References - 10

Study Questions - 11

1. Module Description

This module is the first 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 (ITS) 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 discusses the advantages of transportation field cabinet systems that conform to the standard. It presents the structure and key elements of the standard. It helps users identify and write user needs for ATC Cabinets which helps to justify and support an ATC Cabinet specification.

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

  1. Explain the advantages of transportation field cabinet systems based on the ATC 5301 Standard v02;
  2. Describe the structure of the ATC 5301 Standard v02;
  3. Identify and write user needs for ATC Cabinet systems; and
  4. Create a concept of operations that includes ATC Cabinets.

3. Samples/Examples

Table 1. Input/Output Channels for Transportation Field Cabinet Systems.

TFCS Physical Mounting Internal Bus Signal Monitor Input Channels Monitored Output Channels
ATC Cabinet v02 Rack and Shelf Serial 614.4 kbps Cabinet Monitor Unit 120 32
ITS Cabinet v01 Rack Serial 614.4 kbps Cabinet Monitor Unit 120 28
NEMA TS-2 Shelf Serial 153.6 kbps Malfunction Management Unit 64 16
Caltrans Model 33X Rack Parallel/Discrete Wiring Conflict Monitor 44 16/18
NEMATS-1 Shelf Parallel/Discrete Wiring Conflict Monitor 8 3/6/12/18

Table 2. Requirement traceability example from ATC 5201 Standard v02.

Verify the Requirement
Requirement ID Requirement Title
5.4.3.1 Two Output Channels per HDSP120

Requirement Text

The HDSP120 shall have two output channels.

Justification for the Requirement:

1. The user needs the TFCS to support the use of output device? that have higher channel density than the commonly deployed field output devices.

Source for Justification:

1. UN ID 4.3.4.1

Requirement Text (Comments/Changes)

Guidance:

Related Design Elements

1. 6.2 Model 2202 High Density Switch Pack / Flasher Unit (HDSP/FU)
Requirement Criteria Yes No
1 Is the justification/basis for the requirement clear and valid? X  
2 Is the requirement well-formed? X  
3 Is the requirement unambiguous? X  
4 Is the requirement feasible? X  
5 Is the requirement verifiable? X  
  Insp. Anal. Test Demo.
6 If verifiable, by which method?     X  
Note: An answer of no requires a comment or change in the Comments/Change field of the 'Requirement Text' section above.

Table 3. Requirement traceability example from ATC 5201 Standard v02.

Verify the Requirement
Requirement ID Requirement Title
5.4.4 Low Voltage Switch Pack Modules

Requirement Text

The following power limitations shall apply to the Low Power / Low Voltage cabinet option

  • Less than 30 Volts RMS
  • Less than 42 Volts Peak
  • Less than 60 Volts DC

Justification for the Requirement:

1. The user needs the TFCS to provide for field wiring that is at voltage and current levels below those dangerous to humans.

Source for Justification:

1. UN ID 4.3.4.2

Requirement Text (Comments/Changes)

Guidance:
Related Design Elements
  1. 6.2.2.2 Field Signal Voltage Sense Inputs
  2. 6.2 A. 1 Field Signal Outputs
  3. 6.2.5.1.3 LV+MAINS
  4. 6.2.5.1.4 LV+SIGNAL
  5. 6.2.6.7.2 Flasher Channel Status Thresholds (HDFU-LV mode)
  6. 6.3.5.13.1 HDFU Flasher Thresholds.
  7. 6.3.5.14 CMU Power Failure
  8. 6.3.6.2 2212-LV Field Signal Voltage Inputs
  9. 6.3.7.3 Main Contactor Secondary Status
  10. 6.3.8.1 MAINS Power
  11. 6.3.10.1 Power
Requirement Criteria Yes No
1 Is the justification/basis for the requirement clear and valid? X  
2 Is the requirement well-formed? X  
3 Is the requirement unambiguous? X  
4 Is the requirement feasible? X  
5 Is the requirement verifiable? X  
  Insp. Anal. Test Demo.
6 If verifiable, by which method?   X    
Note: An answer of no requires a comment or change in the Comments/Change field of the “Requirement Text” section above.

Table 4. Requirement traceability example from ATC 5201 Standard v02.

Verify the Requirement
Requirement ID Requirement Title
5.13.1 Diagnostic Display Local Display

Requirement Text

The TFCS shall contain a Diagnostic Display Unit (DDU) which supports local display of both historical and current cabinet status and log data collected by the monitoring subsystem.

Justification for the Requirement:

1. The user needs the TFCS to be of a design that reduces the time required for maintenance personnel to perform maintenance actions in the field.

Source for Justification:

1. UN ID 4.3.1.20

Requirement Text (Comments/Changes)

Guidance:

Related Design Elements

1. 6.5 Model 2220 Auxiliary Display Unit
Requirement Criteria Yes No
1 Is the justification/basis for the requirement clear and valid? X  
2 Is the requirement well-formed? X  
3 Is the requirement unambiguous? X  
4 Is the requirement feasible? X  
5 Is the requirement verifiable? X  
  Insp. Anal. Test Demo.
6 If verifiable, by which method?     X  
Note: An answer of no requires a comment or change in the Comments/Change field of the 'Requirement Text' section above.

Author's relevant description: Figure 1: High Level Functional Block Diagram, High Voltage Version. This is a very detailed engineering drawing. It has approximately 150 small solid and dashed outlined ellipses and rectangles connected by solid and dashed lines and arrows. There is very small text identifying the items and a larger rectangle towards the bottom left that contains a legend for the overall diagram. The diagram shows the detailed functions and interfaces within the ATC 5301 cabinet system.

Figure 1: High Level Functional Block Diagram, High Voltage Version

Author's relevant description: Figure 2: High Level Functional Block Diagram, Low Voltage Version. This is a very detailed engineering drawing. It has approximately 150 small solid and dashed outlined ellipses and rectangles connected by solid and dashed lines and arrows. There is very small text identifying the items and a larger rectangle towards the bottom left that contains a legend for the overall diagram. The diagram shows the detailed functions and interfaces within the ATC 5301 cabinet system.

Figure 2: High Level Functional Block Diagram, Low Voltage Version

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
ATC Advanced Transportation Controller
ATCC ATC Cabinet
CB Circuit Breaker
CBD Central Business District
ConOps Concept of Operations
DC direct current
EMI electromagnetic interference
ESD Electrostatic Discharge
FHWA Federal Highway Administration
GFI Ground Fault Interrupt
I/F interface
I/O input/output
IEC International Electrotechnical Commission
IEEE Institute of Electrical and Electronics Engineers
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
NFPA National Fire Protection Association
NRTL Nationally Recognized Testing Lab
NTCIP National Transportation Communications for ITS Protocol
PF power factor
RFI radio frequency interference
SDO Standard Development Organization
SEMP System Engineering Management Plan
SEP Systems Engineering Process
SSC Small-Sized Cabinet
StdHLD Standards High Level Design
StdRS Standards Requirements Specification
TFCS transportation field cabinet system
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

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.

1. Which of the following is NOT a benefit of using the ATC Cabinet Standard?

  1. Low voltage option for 48 VDC on field wires
  2. Touch Safe Design
  3. Functional standard except where interchangeability desired
  4. Same number of channels per switch pack as ITS Cabinet v01

2. True or False? The High Level Functional Block Diagram identifies how the ATC Cabinet functions perform actuated signal control.

  1. True
  2. False

3. Which of the following is a correct statement?

  1. Rationale of user needs have proposed solutions
  2. User needs must testable
  3. A user need is a major desired capability
  4. Only needs in ATC 5301 v02 are valid for a spec

4. Which of the following is a benefit of building a ConOps for an ATC Cabinet?

  1. Provides justification for investment in ATC Cabinets
  2. Only technical stakeholders are necessary to produce it
  3. Strategic or regional plans are unnecessary
  4. Organization of user needs is the same for all agencies

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