Ettifos C-V2X RSU V2X On Board Unit

Specifications

• Product Name: THEUS C-V2X RSU
• Model: ETF-PRO-RC02
• Version: 1.0
• Author: Sijoong Lee
• Revision History: April 7, 2025 – Initial Version

Revision History

Introduction

This document provides the following information:

• THEUS C-V2X RSU product package
• Installation guide
• How to access the RSU to see or modify configuration settings
• How to configure pre-settings for V2X Communication
• How to transmit and receive data packets using the test application

Unpack SIRIUS

The package contains parts as below.

Table 1: Package parts

Technical Specifications

Equipment Specifications

Table 2: Product characteristics

Input power characteristics

Table 3: Input power characteristics

Front panel with LEDs
Status indicator LEDs are located on the front panel.

Table 4: LED descriptions

Dimension

Dimension, Unit: 219 x 200 x 100 mm (excluding antenna port and mounting bracket)

User Installation Guide

Interface Description

Interfaces from ① to ⑦ in Figure 3 are explained in Table 5.

Table 5: Interface description

Installation method

As shown in Figure 4, horizontal or vertical installation is possible. Position the RSU horizontally (or vertically) and secure it using the stainless-steel Band.

FCC Installation Notice:

This device must be installed at a height between 2.5 meters and 8 meters above the ground and shall not exceed the maximum EIRP output power of 23 dBm to comply with FCC RF exposure requirements.

Access Methods for Device configuration

The THEUS C-V2X RSU provides three interfaces for system access, allowing users to configure settings and control the device.

• Ethernet
• Wi-Fi
• Serial Debug Port

This chapter describes each method of access and provides instructions on how to change the LTE-V2X frequency settings.

Access to RSU Access via Ethernet
The procedure for access to RSU via Ethernet is as below:

1. Directly connect the ethernet port of the RSU to the PC.
2. Set a static IP address in the Network Manager of the PC. The default IP address of ethernet interface inside RSU is 192.168.70.234, hence, the allowed address to the PC ranges from 192.168.70.1 to 192.168.70.254 except for 192.168.70.234.
3. Access RSU via SSH applications such as Putty and Tera Term with the default IP address and the default port number 22. (refer to Figure 5 for more detail)
   • Figure 5 Statis IP setting & SSH connection

In case the IP address of the ethernet interface needs to be changed, follow the instructions below.

1. Open the ’50-eth.network’ file and change the ‘Address’ and ‘Gateway’ (Line 14 to 15) values to new ones.
2. Open the ‘resolv.conf’ file and change ‘nameserver’ (Line 0) values to new ones.
3. Restart ‘systemd-networkd’ or reboot DUT to apply changes
4. Open the ‘/lib/system/system/ssh.socket’ and configure the port number (optional)
5. Restart the DUT to apply network configuration

Access via Wi-Fi
The THEUS C-V2X RSU operates in Wi-Fi Access Point (AP) mode, allowing users to wirelessly connect to the device via its SSID. The default IP address of the RSU’s Wi-Fi interface is 192.168.80.1. Users can customize Wi-Fi settings, including SSID, password, and IP address, by editing the configuration file(‘/etc/create_ap_ettifos.conf’). Once connected to the RSU via Wi-Fi, users can access the system using SSH client in the same way as through the Ethernet interface.

• IP Address: 192.168.80.1
• SSID (Access Point): ETF-AP
• PW: 1234567890

Access via Debug port (RS232)
THEUS C-V2X RSU supports UART serial communication using a manufacturer-supplied USB cable for debugging the device.
The procedure for establishing a serial connection is as follows:

1. Connect the cable provided by the manufacturer to a USB port on the computer.
   • (In case of the device being recognized as an unknown device on Windows Device Manager) Download CP210x USB to UART Bridge VCP driver at CP210x USB to UART Bridge VCP driver – Silicon Labs (silabs.com) and install it by doing a ‘driver update’ in Windows Device Manager.
2. Once installed, check the COM port which responds to Enhanced COM ‘Port (COM & LPT)’ of Device Manager as shown below. (The COM port number may vary depending on the user’s computer environment. In this manual, COM88 is used as an example.)
3. Access RSU via a terminal program (such as Tera Term and Putty) with the COM port (e.g., COM88) and the baud rate 115200.

Configuration guide

• In LTE-V2X communication, the pre-configuration XML file defines the essential parameters for network communication among vehicles, roadside infrastructure, and other system components. This file includes configurations for V2X applications, security settings, network interfaces, and communications protocols.
• For LTE-V2X sidelink communication, pre-configuration parameters-particularly the C-V2X channel settings-must be consistent across all devices. When conducting a C-V2X communication test for the first time between the TEHUES C-V2X RSU and another platform, it may be necessary to provide Ettifos with the pre-configuration XML file used on the other platforms.
• However, in most use cases, users only need to configure the C-V2X channel (frequency and bandwidth), which can be easily done by selecting from Ettifos’ predefined XML files (Table 6).
• This chapter explains how to configure the device for operation on different V2X channels.
• Currently, THEUS C-V2X RSU provides four XML files in ‘/etc/v2x/cv2x’ directory and each of them have different V2X channel information as shown below.

Table 6: Predefined XML files

Users can easily change the LTE-V2X channel using ‘cv2x-config’ program in RUS.

The ‘cv2x-config’ provides the functions explained in Table 7.

• Usage: cv2x-config –<command name><command parameters>

Table 7: cv2x-config command list

The procedure to change LTE-V2X channel is as follows.

1. Stop V2X radio: Turn off V2X radio before channel change.
2. Set pre-configuration xml file: Choose one of four xml files in Table 6.
3. Start V2X radio: Turn on V2X radio.

Test application acme

• ‘acme’ (Automotive Communications Modem Emulator) is a test application developed by LTE-V2X chipset vendor and designed to provide a platform for testing and validation V2X modems in real-world scenarios. This tool assists in evaluating the performance and compliance of V2X communication devices.
• The way for users to do packet transmission/reception using ‘acme’ is introduced below.

Usage of ‘acme’

The options that ‘acme’ support are as follows.

Table 8 acme options

Tx/Rx Test Guide
One RSU works as a transmitter, and the other one works as a receiver. The default mode of ‘acme’ is Tx (transmission) mode, hence, -R option is needed for the receiver. The following are simple examples of the ‘acme’ commands for Tx/Rx.

Example of Tx Command: $acme

Example of Rx Command: $ acme -R

Troubleshooting

Troubleshooting with RF Tx/Rx

• No RF signal is transmitted
  • Make sure that V2X antennas are correctly connected to the ANT-0 and ANT-1 antenna ports.

C-V2X Status Check

• V2X Status: [0: Initial / 1: Normal / 2: Error]

Safety Precautions

• Always turn off the power before moving, installing, or connecting/disconnecting the cables and connectors.
• Make sure that the power source matches the required input power of the devices.
• Do not modify any part of the device and do not open the housing case as this may cause malfunctions or electric shocks. Opening the housing case will avoid your warranty.
• Keep the device dry. Humidity and all types of liquid or moisture may corrode electric circuits.
• Be sure that the ventilation holes are not obstructed during operation, as this may cause malfunctions due to overheating.
• Make sure that all antenna ports relate to antennas or properly terminated (e.g., with a 50 Ω coaxial termination resistor) during operation. Unterminated ports may cause RF signal distortion or hardware damage due to excessive reflected energy.

FCC

FCC notification to users

This device complies with part 15 of the FCC Rules.

Operation is subject to the following two conditions:

1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired operation.

This equipment has been tested and found to comply with the limits for a CLASS B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.

This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. if this equipment does cause harmful interference, the user is encouraged to try to correct the interference by consulting with a dealer or an experienced technician for technical assistance. Any changes or modifications to equipment not expressly approved by the party responsible for compliance could void user’s authority to operate the equipment. The antenna(s) used for this device must be installed to provide a separation distance of a least 15 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.

NDA Requirement:
This device is distributed under a Non-Disclosure Agreement (NDA). Any technical documentation including this manual must not be disclosed without permission. Refer to the attached NDA exhibit submitted to the FCC.

MORE INFO

• Our aim is to provide customers with a timely and comprehensive service.
• Existing customers: please raise an issue on Ettifos Help Center for assistance.
• New customers: please email pr@ettifos.com for any assistance.

GENERAL NOTES

• Ettifos offers this information as customer service.
• The information provided is based upon customer requests.
• Ettifos makes every effort to ensure the quality of the information it makes available.
• Ettifos does not make any warranty as to the information contained herein, and does not accept any liability for any injury, loss or damage of any kind incurred by use of or reliance upon the information.
• All information supplied here is subject to change without prior notice.

COPYRIGHT

• The information contained here is proprietary technical information of Ettifos Co.
• Transmission, reproduction, dissemination and editing of this document as well as utilization of its content are forbidden without permission.
• Offenders will be held liable for payment of damages.
• All rights are reserved in the event of a patent grant or registration of a utility model or design.
• © 2025 Ettifos Co. All rights reserved.

CONTACT INFORMATION

• Ettifos Co.
• Suite 405, 41 Beolmal-ro 50beon-gil,
• Bundang-gu, Seongnam-si, Gyeonggi-do Republic of Korea
• Tel: +82 31 8039 5000
• Email: pr@ettifos.com
• www.ettifos.com

FAQs

• Q: How do I reset the device to factory settings?
  • A: To reset the device, locate the reset button on the device and hold it down for 10 seconds.
• Q: What should I do if the LEDs on the front panel are not lighting up?
  • A: Check the power source and connections. If the issue persists, contact customer support.

Documents / Resources

Ettifos C-V2X RSU V2X On Board Unit [pdf] User Manual ETF-PRO-RC02, 2BHJL-ETF-PRO-RC02, C-V2X RSU V2X On Board Unit, C-V2X RSU V2X, On Board Unit, Board Unit, Unit

References

• User Manual