The DEJAMM-R sentinels are autonomous devices that continuously monitor all the downlink and uplink GSM-R bands, which are used for ETCS Level 2 signalling in high-speed rail systems.

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Dejamm-R

DEtection of JAMMing in Railway networks

The DEJAMM-R sentinels are autonomous devices that continuously monitor all the downlink and uplink GSM-R bands, which are used for ETCS Level 2 signalling in high-speed rail systems.
Each sentinel includes a wideband signal receiver and analyzer and runs real-time Digital Signal Processing (DSP) algorithms to perform wireless channel measurements and to detect interferences, both accidental and deliberate.
Alarms are promptly detected (< 1 second reaction time) and indicated via SMSmessages (or other) to a remote centre, via either the GSM or the GSM-R bands. Periodic status reports are also issued to constantly monitor the GSM-R network health. For maximum coverage and security, the DEJAMM-R devices should be installed along the railway tracks of high-speed lines with a typical distance of a few kilometres between two consecutive sites.
To reduce the installation costs, solar panels can be used to power the devices. Since the DEJAMM-R sentinels are autonomous, no ordinary maintenance is needed.

Main Features

  • Downlink (from RBC) and uplink (from train) SINR estimation
  • Status report of all GSM-R channels in < 1 second
  • Interference and jamming detection
  • Remote alarm generation via SMS in GSM/GSM-R bands
  • Can be solar-powered to reduce installation costs
Technical details

Environmental conditions: Temperature 25 C to +70 C
Scanning frequency: 876-880 MHz, 921-925 MHz
Detection time: < 1 s
Reliability: MTBF > 4 years
Interface for installation/maintenance: IEEE 802.11a/b/g/n
Interface for remote monitoring: GSM, GSM-R
Power consumption: 60 W
Power supply: - Unregulated AC 230/120 V
                        - Regulated DC 12 V
                        - Solar power (external panel and batteries required)
Weight: 10 kg (includes 6 kg backup battery)
Dimensions (unit: mm): 220 (L) x 130 (W) x 300 (H)