A motor vehicle has a drive motor and a navigation system having a display for displaying a map image. The method generally includes allowing a user to access the voice application and provide input to the voice application; creating, upon a user request, a bookmark to a location in the voice application; and providing the user with access to the bookmark in the voice application in order to return to the bookmarked location. The optical signals are extracted from the fiber ring with optical adddrop multiplexers, and the data carried by the optical signals is then supplied to the corresponding group of TDM adddrop multiplexers. The method further includes encoding second data to be stored at a second physical page.