Juridical Recording Unit (JRU)

Juridical Recording Unit (JRU)

EKE Trainnet® JRU Side EKE Trainnet® JRU Front EKE Trainnet® JRU with MVB Interface EKE Trainnet® JRU with Multiple Added Interfaces


EN 50155
EN 45545

IEEE 1482-1.1999
IEC 62625-1
EEIG 97E461-3.1998

Dimensions (W x H x D):

3U 84TE Rack
483mm x 133mm x 215 mm
(installation width 443 mm)

10.4 Kg + chosen optional interface modules
Input Power:

5 V DC ± 5 % (1 A max., 0.5 A typ.)
Temperature Range (operational):

-40 °C…+70 °C
MTBF (40 ºC ambient temperature):
Depends on selected options. Please ask.
3 Or 4 Isolated RS-485
1 x 10/100 Mbit/s Ethernet, M12 connector
1 x USB 2.0 Host for retrieval

Option: MVB, CAN, I/O etc.

2 GB or 16 GB
Protection levels (Rugged memory Module):
Shock: Up to 100 g / 10 ms and 55 g / 100 ms
Crush: Up to 110 kN for 5 minutes in all axes
Penetration: Up to 23 kg drop from a height of 1,5 m focussed on an area of 30 mm2
Temperature: Up to 700 °C for 5 minutes and 650 °C for 30 minutes followed by 300 °C for 1 hour followed by 100 °C for 5 hours
Chemical Immersion: Winter Diesel (*), Summer Diesel (*), Regular Water (*), Salt Water (*), Lubricating Oil (*), Transformer Oil (**), Hydraulic Oil (**), Anti Fire Fighting Foam (*), Refrigerant R134A (**), Alcohol (**), Anti Freeze (**), Battery Acid (**)
(*) minimum for 48 hours
(**) minimum for 60 minutes
Magnetic Field: Current flow of 64 kA at rising rate of 107 A/s
Hydrostatic pressure: Immersion in salt water at a depth of 15 meter for 48 hours

module functions

The Trainnet® Juridical Recording Unit (JRU) is a train event recorder complying with the ERTMS/ETCS standard. Like any Trainnet® Event Recorder, it is an on-board data recorder for collecting, storing and retrieving vital train-borne information, including audio and video signals.

key features

The Trainnet® JRU can be used standalone or integrated to a Trainnet® train computer or gateway. The Trainnet® JRU is made of a Rugged Memory Module (RMM), a processor and a power supply (Trainnet® PSV and PIU) fitted in a standard 19” rack. Additional bus interfaces can be easily added to the rack for connectivity with for instance MVB and CAN, making the Trainnet® JRU extremely versatile. Trainnet® I/O modules can also be added to the rack and be processed directly by the JRU.

The Trainnet® JRU can record data from the ETCS (i.e. European Vital Computer, EVC) and/or from nation-specific control systems (i.e. Specific Transmission Module, STM). The ETCS architecture illustration highlights the two standard setup options. The Trainnet® JRU stores both analogue and digital signal data, for a predetermined period of time. The JRU can acquire data from its Ethernet port, its RS-485 port or from any added bus interfaces.

The JRU can record video streams. For easy data retrieval, the stream format can be made compatible with your CCTV Software or any other video analysis Software that you use. Alternatively, we can develop customized video analysis tools to fit your needs.

Data can be retrieved at any time via the Ethernet port or with a USB-stick. The Trainnet® TIP Software (Train Inspection Program) enables data analysis after an incident or as a regular procedure to optimize operations.

The Trainnet® Rugged Memory Module (RMM) ensures a high level of data protection. This crash-proof construction guarantees that the memory board is protected against fire, magnetic fields and any liquids, as well as against any mechanical stress during an impact or continued pressure.

The memory board is embedded in a protected fire insulation block, surrounded by a steel case that is hermetically sealed. The design of the Trainnet® RMM fulfils the British (GM/RT2472-1.2002) and European (EEIG 97E461-3.1998) crashworthiness as well as the IEEE (1482.-1.1999) and IEC 62625-1 standards.


Memory can be 2GB or 16 GB.

Front-panel Inprints:
Localized front-panel imprints available on request in English or in the language of your choice.

Interface Modules:
MVB, CAN and any Trainnet® I/O modules.




Illustration: ETCS architecture

Published on: 2017-03-02

EKE-Electronics Ltd
Piispanmäentie 5
02240 Espoo
Tel +358 9 6130 30