English
Français DOF1 System Description
The diagram above portrays the installation of the Dof1 system. It comprises 2 parts:
- The first is installed in a technical zone close to the platform and is equipped with landing doors. It is called “DOF1 Sol et Antenne Dof1 Sol”(Ground Dof1 and Ground Dof1 Antenna).
- The second part is installed at the front and the rear of the train interior. This second part is called “DOF1 Bord et Antenne Dof1 Bord”(Onboard DOF1 and Onboard Dof1 Antenna).
Communication between the train and the ground is made using a magnetic loop connection, provided by an Antenna comprising two pieces of equipment referred to in the plan as Onboard Dof1 Antenna and Ground Dof1 Antenna.
Communication between the Ground Dof1 (at the platform) and the Dof1 onboard the train is only possible when the “Onboard Antenna”equipment is aligned above the “Ground Antenna” equipment, that’s to say when the train is correctly positioned in the station.
The use of a magnetic loop guarantees that there is no interference with communications between the ground and a train which isn’t alongside the platform.
The side and ground systems communicate with each other by using a secure series protocol. The side and ground modems modulate and demodulate the digital signal in a current loop.
In this way, the DOF1 system comprises:
Automatons situated in the Ground DOF1 cabinet.
- A Ground DOF1 cabinet placed in a technical zone on each platform. It receives the opening and closing instructions emitted by the conductor and transmits them to the side of the platform. These instructions can also be received from the SAET (an automatic system, which is active when trains are on automatic pilot), and can be transmitted to the sides as well.
- “Ground DOF1 antenna”equipment situated on the track on the ground at the beginning of the platform (at the front of the train when it is stopped at a station) to ensure doors open to the right. This equipment is aligned above the “Onboard DOF1 antennae” ground equipment when the train is correctly positioned in the station; that is to say within around 1 metre of the targeted theoretical stoppage point. The “Ground DOF1 antenna” equipment comes in the form of a belt, the dimension of which takes into account the desired stoppage zone of around two metres.
- Two “Onboard DOF1 antennae”equipment parts at the front and rear of the train situated on the train’s bogies. These are connected to the Onboard DOF1 and ensure communication with the ground equipment.
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Example of the track Belt
Two Onboard DOF1 situated inside the train, which enable the conductor’s instructions to be relayed as well as the reception of data from the Ground DOF1, thus ensuring the coherence of the safety instructions.
The Onboard DOF1 antenna must be installed at the rear and the front of the train, which is operational in both directions (a train at the end of the line goes back in the opposite direction, the rear of the train becoming the front and the conductor changing cab). For ‘standard’ stations equipped with two platforms and for which the opening of the train doors is performed to the right, a single Ground DOF1 Antenna is installed at the front of the platform. Two antennae are needed for stations where both the opening of the doors and the platform are situated on the left hand side.
Pictures
 General view of 2 wagons and their bogies |
 Onboard DOF1 antenna prototype fixed onto the bogie |