18:51 01.10.2023
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Lots of PoE and 6 SIM in nROK-7251 transport computers from Nexcom

Nexcom has launched a series of embedded high-performance computers for railway transport nROK-7251. The PCs have protected M12 connectors and support RAID.
The series includes three models: nROK-7251-WI-7C4IP, nROK-7251-7C4, nROK-7251-7A. The main differences are the degree of enclosure protection, the number of I/O ports, and the power supply voltage. A detailed comparison is given in the table below.
The compact design of the PC makes it easy to install it in a limited space. In addition a modern Intel Core i7 9th gen CPU provides high performance with low heat dissipation, only 35 watts.

Front panel nROK-7251-WI-7C4IP

Front panel nROK-7251-7C4

Front panel nROK-7251-7A

Computers nROK-7251-WI-7C4IP, nROK-7251-7C4, nROK-7251-7A have an aluminum case with cooling fins. PCs have high computing power thanks to the Intel Core i7-9700TE processor with a base frequency of 1.8 GHz and max frequency of 3.8 GHz in Turbo Boost mode. The chipset is based on the modern Intel Q370 chipset. Intel UHD 630 is responsible for graphics. The RAM supports dual-channel mode and can be expanded to 64 Gigabytes of DDR4 SO-DIMM.

Model name nROK-7251-WI-7C4IP nROK-7251-7C4 nROK-7251-7A
Enclosure protection IP class IP65 Not certified
Processor support Intel Core i7-9700TE, 1.8 GHz (max. 3.8 GHz)
Chipset Intel Q370 Chipset
RAM 2xDDR4 SO-DIMM up to 64 GB, installed capacity 8 GB (4+4 GB)
Data storage 2x2.5” SATA 3.0 RAID
2xmSATA slot
USB 4xUSB 3.1 (with cover)
2xUSB 2.0 (1xM12)
4xUSB 3.1
2xUSB 2.0 (1xM12)
RS-232/422/485 2xDB9 full RS-232 (isolated)
2xDB9 full RS-232/RS422/RS485 (isolated)
DIO 4xDI (M12)
4xDO (M12)
GbE LAN 1xM12 RJ-45 LAN, GbE
4xM12 RJ-45 LAN, GbE,
PoE 802.3af/at, max. 60W
1xM12 LAN, I210-IT GbE
4xM12 LAN, I210-IT GbE,
PoE 802.3af/at, max. 60W
2xM12 LAN, I210-IT GbE
Expansion slots 1xFull size mini-PCIe (USB 2.0 + PCIe 3.0/SATA 3.0)
1xFull size mini-PCIe (USB 2.0 + PCIe 3.0/SATA 3.0)
1xFull size mini-PCIe (USB 2.0)
1xM.2 Key B 3042/3050/3052 (USB 2.0 + USB 3.1 Gen2) with 2xExternal SIM
1xM.2 Key B 3042/3050/3052 (USB 2.0 + USB 3.1 Gen2+ PCIe 3.0
GPS 1xU-blox NEO-M8N GNSS for GPS/Glonass/QZSS/Galileo/Beidou, G Sensor (3-axis, 10-bit)
SIM card slot 6
Linear audio input/output 1xM8 (6-pin) for 1xMic-in (mono), 1xLine-out (Stereo)
Antenna hole 12
OS support Windows 10 and Linux
Input voltage 1xM12 5-pin 24-110 V DC isolated 1xM12 24V DC without isolation
Operating temperature -40°C to 70°C with industrial SSD
Dimensions 260 mm (W) x 256 mm (D) x 110 mm (H), 6.5 kg 260 mm (W) x 256 mm (D) x 110 mm (H), 6.5 kg 260 mm (W) x 256 mm (D) x 84 mm
Standards and certificates CE
FCC Class A
FCC Class A
EN 50155:2017
Environment temperature EN 50155, class OT4 (-40~70°C)
Shock, vibration IEC 61373 class B
Power interrupts class S1, S2
EMC EN 50121-3-2: 2016

Back panel nROK-7251-WI-7C4IP

Back panel nROK-7251-7C4 and nROK-7251-7A

Examples of application of computer nROK-7251

Video surveillance

nROK-7251-WI-7C4IP / nROK-7251-7C4 are equipped with 5 LAN ports. Four ports support 802.3 af/at PoE technology and provide up to 60 watts of power. PoE technology allows you to connect and power an IP camera. The train driver will be able to see everything that happens in the passenger compartment/car of the vehicle through 2 displays (1x VGA, 1x HDMI for nROK-7251-7C4). Video stream from the cameras can be recorded on two 2.5" SATA SSD/HDD. They are conveniently located and can be easily removed via external slots. The operating system can be installed on an internal M.2 or mSATA drive.

Data control

Built-in 8xDIO I/O ports nROK-7251-WI-7C4IP, nROK-7251-7C4, nROK-7251-7A allow you to connect additional sensors. Information from them, GPS and the three-axis G Sensor can be displayed on the screen in the driver's cab or transmitted to the control center. For example, four digital inputs can be used to control the position of doors, and four digital outputs can be used to control interior lighting.

Fleet management

To expand the capabilities, the nROK-7251 series has 3 miniPCIe slots and 2 M. 2 slots. You can install Bluetooth, WLAN, or 3G/4G modules in them. You can also duplicate 3G/4G modules. 6 slots for communication modules and 6 SIM cards are available. Now the mobile Internet will not be interrupted. The current location and other vehicle data will be transmitted to the head center reliably. And the trains will run unchanged in the schedule.

Embedded computers nROK-7251 have a wide range of operating temperatures from -40°C to 70°C, which is especially important when operating in the railway industry. In addition, PCs are certified by EN 50155:2017, have secure M12 connectors and a special power system to connect to the on-board train network.

For further technical information, inquiries about offers or placement of orders, please contact our sales team at
18:51 01.10.2023