RSU-301E Information Sheet

V2X Roadside Unit, V2Xcast® – ITS-G5 stack, Europe

RSU-301E:V2X Roadside Unit, V2Xcast-ITS-G5 stack, Europe


RSU-301E is a V2X (Vehicle to Everything) roadside unit with waterproof IP67 enclosure designed to enable V2X in the Cooperative Intelligent Transport Systems (C-ITS) environment. RSU-301E provides secure data communication between vehicles and infrastructure equipment, such as Advanced Traffic Controller, to enable cooperative ITS applications. Preloaded ITS-G5 stack and V2Xcast® software, RSU301E provides highest Vehicle to Infrastructure (V2I or I2V) application flexibility to fit the various deployment needs of different ITS and V2X system integrators.


  • A rich SDK contains facility-layer messages, APIs and example codes supports quick development of V2X applications.
  • Seamlessly enable V2X on roadside Linux host via Ethernet connection and V2Xcast®.
  • On-board mPCIe socket allows add-on module such as LTE modem.
  • Surge protection on the antenna ports and PoE enhance immunity and robustness in voltage spikes events.


  • Autotalks® CRATON2 V2X communication processor
    • dual 600MHz ARM Cortex-A7 32-bit CPU cores
    • 1140 DMIPS processing power each Cortex-A7 core
    • ARM Cortex M3 32-bit processor with memory protection unit (MPU) and ECC protected memory
  • Autotalks® PLUTON2 V2X RF Transceiver
  • Embedded Hardware Secure Module (eHSM)
    • Dedicated ARM Cortex-M0 CPU
  • Telit® SL869-V3 GNSS module (SL869-ADR optional)
Operation System Linux Yocto
System Service RS-232 console (baud rate 115200 bps) through on-board interface
System Memory 128MB NAND, 128MB DDR3
Preloaded Firmware ETSI ITS-G5 includes IEEE 802.11p, GeoNetwork, BTP, DCC, and Security and CCMS client* (*. Est. in Q2 ’21)
Development Tool V2Xcast® SDK, including APIs and ITS-G5 facility layer messages
Hardware Security
  • Dedicated ROM containing certified secure V2X signing firmware
  • Secure encrypted off-chip storage of private keys
  • Private material is inaccessible outside HSM
  • Capable of >110 signatures / second, with <9ms signing latency for ECDSA NIST P256 or ECDSA Brainpool P256R1
  • Line-rate ECDSA verification engine (>2500 ECDSA NIST P256 verifications / second)
  • Embedded HSM supports less than 9ms latency on ECDSA NIST P256 signing, it’s granted FIPS 140-2 Level 3 certification*
  • Tamper detection
  • Frequency band: 5.85 ~ 5.925 GHz
  • Radio mode: ITS-G5
  • Channel: 172, 174, 176, 178, 180, 182, 184
  • Channel bandwidth: 10MHz (5MHz & 20MHz by project)
  • Data rate: 3, 4.5, 6, 9, 12, 18, 24, 27Mbps for 10MHz BW signal
  • RF transmit power: > +20dBm, Class C RF spectrum mask compliant with margins
  • RF receive power: < -92dBm, compliant with SAE J2945
  • Update rate: 10Hz
  • Sensitivity:
    • Acquisition: -146dBm
    • Navigation: -158dBm
    • Tracking: -162dBm
  • NMEA Standard: NMEA 0183
  • Accuracy: 1.5m (CEP50 with SBAS)
  • Telit® SL869-V3 GNSS receiver supports GPS/Glonass constellations. SBAS like EGNOS (EU), WAAS (US), and MSAS (JP) are also supported
External Connector
  • one M25 waterproof Ethernet port with 802.3af PoE
  • two Type-N RF port for DSRC
  • one Type-N RF port for GNSS
On-Board Interface
  • Two MHF RF connector (DSRC)
  • One MMCX RF connector (GNSS)
  • One Mini PCIe slot (for LTE module) *
  • One SIM slot*
  • One PoE Module slot
  • LED headers

(*. Support by project)

    • Start-up: Blinking Green
    • Operational: Solid Green
    • FW upgrade: Amber (R+G)
    • Fault: Red
  • two Type-N outdoor 7.6dBi DSRC antennas
  • one Type-N outdoor GNSS antenna
Power Supply 802.3af PoE (12W)
Operation Temperature Range ambient: -40°C ~ +70°C
Operating Humidity 10% ~ 95%, non-condensing
Product Dimension 220.5mm (L) x 127.5mm (W) x 72.3mm (H) (excluding antennas)


Featuring with V2Xcast®, Unex’s innovative software technology, RSU-301E allows two modes of operation:

1. Hostless Mode: RSU works as a standalone full-featured V2X unit

RSU-301E Roadside Unit,Applicaon Host

2. Hosted Mode: RSU works as a V2X communication unit to the application host

RSU-301E Roadside Unit,Applicaon Host

Unex RSU-301E enables ease of V2X software development through its V2Xcast® technology. Previously, V2X protocol software had to be built and verified complicated APIs, resulting in a duplicated effort, risk and cost. With Unex intuitive V2Xcast solution that provides ready-to-use V2X communication services for V2X applications, customers can significantly cut time-to-market with less development and testing cost.

V2Xcast is supported in RSU-301E to facilitate V2I/I2V application development. It includes two parts – V2Xcast Service and V2Xcast SDK.

V2Xcast SDK

Deploy V2Xcast SDK in either RSU-301E or external application host, it includes APIs to get the services from V2Xcast Service and the main functions of facility layer (ITS-MSG), such as message encoder/decoder and example code.

V2Xcast Service

V2Xcast Service image resides in RSU-301E, it combines ETSI ITS-G5 protocol stack that includes GeoNetwork, BTP, DCC, Security, and POTI. V2X communication protocols will be easily enabled via configuration input without any programming.


RSU-301E Roadside Unit,V2X safety msg, app

Security functions provided by V2Xcast® are designed based on a highly secure HSM (Hardware Security Module).

The highly secure HSM with FIPS 140-2 Level 3 certification is embedded in RSU-301E.

Cryptographic processor eliminates bottlenecks, maximizes application performance and offload CPU’s computation. To protect your sensitive cryptographic keys in a high-assurance key vault, the design provides leverage a keys-in-hardware solution. With the keys-in-hardware solution, all the cryptographic operations are inside HSM and those keys never leave the HSM.

Typical Using Case

RSU, Intelligent Transportation SystemETSI TC-ITS: CAM, DENM, SPATEM, MAPEM 1609.x: J2735 BSM, SPaT, MAP

The traffic controller unit acts as SPATEM/MAPEM or SPAT/MAP generator to perform the relative encode/ decode. Implement the required V2X stack on RSU-301 to co-operatively work with the traffic controller unit and serves to receive and forward the SPATEM/MAPEM or SPAT/MAP messages as a payload for communication between vehicles and traffic controllers in co-operative ITS. V2I/I2V applications can be flexibly implemented on the traffic controller unit or RSU-301.


Package contents

  1. One RSU-301E
  2. Two outdoor DSRC antennas
  3. One outdoor GNSS antenna
  4. One PoE surge protector
  5. One cable gland
  6. Mounting Bracket and accessories
  7. One earth wire
  8. Hardware Guide and software development kit available on Unex server

    Contact Unex

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    7F-2, No.100, Sec.1, Jiafeng 11th Road., Zhubei City, Hsinchu County 302052, Taiwan



    mPCIe System-On-ModuleOn-Board UnitRoadside UnitStarter KitOthers

    DSRC stack, U.S.ITS-G5 stack, Euro.C-V2X stack, U.S.Others


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