> For the complete documentation index, see [llms.txt](https://grid-exchange-fabric.gitbook.io/gxf/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://grid-exchange-fabric.gitbook.io/gxf/architecture/functionallayersoverview.md).

# Architecture functional layers

## Functional view

*Image, functional layers overview* ![Functional Layers Overview](/files/c93uqGfVUkYFwbkrgpm6)

### Starting architecture

The Functional view shows an overview of the most important functions of the system. The two images below show the starting architecture and functional reference architecture respectively.

*Image, functional starting architecture* ![Functional Starting Architecture](/files/gIaIq53jKNhK0ceOGOY9)

1. Web applications
2. Open Smart Grid Platform
3. Web services
4. Basic functions
5. Database
6. Communication infrastructure (CDMA/GPRS/Ethernet)
7. IP infrastructure
8. Open Street Light Protocol (OSLP)
9. Public Street Lighting Device (PSLD) or Sub Station Lighting Device (SSLD)

## Functional Reference

This model partitions the system in seven functional clusters (vertically) which are shown on the system layers (horizontally). The circled numbers refer to image 1.

*Image, functional reference architecture* ![Functional Reference Architecture](/files/wJSbWYSbSJKXH9shb2p4)

Vertical clusters:

* Device installation
* Device management
* Firmware management
* Configuration management
* Schedule management
* Ad-hoc control and status
* Monitoring

Horizontal System layers:

* Web applications
* HTTPS/SOAP communication
* Platform
* Open protocols
* Smart devices