Introduction
The ATC family provides an open hardware and software platform for transportation applications. Controller architecture, cabinet architecture and application interfaces are covered by separate standards: ATC 5201, ATC 5301 and ATC 5401. Specify the required editions, cabinet interfaces, application software and communications, then verify the selected product’s implementation. ATC architecture alone does not establish NTCIP support or automatic application portability across links.
ATC vs TS-2
NEMA TS-2 distinguishes Type 1 and Type 2 controller assemblies. Type 1 uses an SDLC link to communicate with cabinet equipment; Type 2 also provides legacy parallel interfaces. Confirm the specified type, standard edition, cabinet wiring and controller documentation. Do not describe all TS-2 interfaces as one 37-pin connector or assume central-system integration is identical for every product.
The ATC family provides an open hardware and software platform for transportation applications. Controller architecture, cabinet architecture and application interfaces are covered by separate standards: ATC 5201, ATC 5301 and ATC 5401. Specify the required editions, cabinet interfaces, application software and communications, then verify the selected product’s implementation. ATC architecture alone does not establish NTCIP support or automatic application portability across links.
Connected-vehicle, transit-priority and sensor integration depends on the selected hardware, application software, supported interfaces and project requirements. Do not infer these functions, or their absence, solely from an ATC or TS-2 label.
ATC Architecture
The ATC 5.2b controller has three layers:
1. Hardware platform: a standardised processor board defined by ATC specifications
2. Linux-based OS: an embedded Linux with real-time extensions
3. Application software: the timing application, written to ATC APIs, portable across hardware platforms
The same timing application can run on different hardware vendors’ ATC controllers without recompilation. This is the key benefit of ATC over TS-2.
ATC APIs
The ATC defines standard APIs for:
- Phase control (read/write phase state)
- Detector input (read detector state)
- Timing parameters (read/write timing plan)
- Coordination (sync to system reference)
- Communication (serial, IP, 4G)
- Logging and diagnostics
For a proposed GAOQIAO ATC configuration, request the applicable controller and API standard editions, supported NTCIP objects and versions, interface documentation and test results. Compatibility with a central system must be demonstrated for the exact hardware, firmware and configuration offered.
When to Choose ATC
Choose ATC for:
- New North American installations
- Mixed-vendor networks where one central system runs many controllers
- Adaptive control deployments (SCATS, SCOOT, InSync)
- Connected vehicle and transit signal priority applications
Stay with TS-2 for:
- Retrofits into legacy TS-2 cabinets
- Single-vendor networks where TS-2 is sufficient
Availability of TS-2 or ATC configurations must be confirmed with GAOQIAO for the required model, interfaces and project specification.
Featured Products
GAOQIAO supplies ATC 5.2b controllers with full NTCIP 1202 v03 compliance. See the NEMA TS-2 vs ATC comparison.
Conclusion
Select controller and cabinet standards from the authority’s requirements and the existing installation. For new work, specify the approved editions and required functions rather than assuming one architecture is universally preferred. For replacements, verify electrical, mechanical, software and communications compatibility. Confirm GAOQIAO’s offered configuration and supporting documents in the project quotation.
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Frequently Asked Questions
Can ATC controllers run the same timing as TS-2?
Yes. ATC controllers can run TS-2 timing plans via emulation, plus native ATC applications.
Is ATC accepted by all US state DOTs?
Most states accept ATC for new installations. Check with your state DOT for specific requirements.
Can I upgrade a TS-2 cabinet to ATC?
Retrofitting a TS-2 cabinet for an ATC controller requires review of the actual controller, bus, output panel and cabinet interfaces. Required modifications and retrofit-kit availability must be confirmed; a kit is not automatically required or sufficient.
Relevant GAOQIAO products
These public GAOQIAO catalogue pages are related to the guide. Open them for the representative description, then confirm the latest drawing and configuration before ordering.
- Traffic signal controllersWired and solar controllers with 6, 22, 44 and 56 output options.
- LED traffic signal heads200mm, 300mm and 400mm signal heads with MUTCD, EN12368, GB14886 compliance.
- Signal polesVertical, signal arm and double-arm poles for any intersection geometry.
- Spare parts and accessoriesSpare LED modules, lenses, visors, surge arrestors and anchor bolts.
Related buyer resources
- Traffic Signal Controller Cabinet Guide
- Traffic Light Wiring Diagram Guide
- Traffic Light IP Ratings Guide
- Traffic Signal Head Specification Guide
- Solar Traffic Signal Site Survey
- Contact GAOQIAO
Request a quotation for an ITE ATC 5.2b controller architecture