Repeater

GEZ Rail Solution has successfully retrofitted or upgraded a total of over 60 vehicles in the ICE 1, ICE 2, ICE 3 and ICE T series

The repeater amplifies the mobile radio signal in both directions. In the downlink, the signal is picked up by the base station via an external antenna located on the train roof and forwarded to the intrain repeater inside the train, which amplifies the signal.
The amplified signal is usually emitted via a slotted cable mounted in the carriage ceiling (e.g. in Deutsche Bahn ICE carriages).
The same happens in the opposite direction (= uplink). The cell phone’s transmission signal is picked up via the slotted cable inside the carriage, routed to the intrain repeater, amplified and transmitted to the mobile phone station via the train’s roof antenna.

GPS receivers are integrated into the train antennas, which switch off the mobile phone technology abroad and in stabling facilities.

Without the intrain repeater, an interference-free connection without interruptions would only be possible in areas where the field strengths are sufficiently high to overcome the shielding of modern passenger trains.
This is usually the case in metropolitan areas and railroad stations.

In rural areas in particular, mobile phone networks are not as well developed, meaning that mobile phone coverage in carriages without an intrain repeater is not always guaranteed.