The OnStar® operation is actually a combination of
many different technologies working together to form the OnStar® Service.
| • | Cellular Telephone Equipment with Handsfree Audio Processing |
| • | Global Positioning System (GPS) satellite navigation system |
| • | GM Class 2 Electronic Communications between Vehicle Component
Modules |
| • | GM Universal Asynchronous Receiver Transmitter (UART) communications
on vehicles with limited Class 2 communications |
| • | Entertainment and Communications buss (E&C) communication
between vehicle entertainment and comfort modules |
| • | Desktop computer software allowing the OnStar® Center advisors
to send/receive data to the vehicle over the cellular modem |
| • | Map software that allows the OnStar® Center to view the vehicle's
exact location superimposed on a computer generated map |
| • | Extensive database storage and retrieval capabilities to allow
OnStar® Advisors the ability to quickly access requested information |
