Application | SIGM-3250 In-vehicle Box Computer in Nanchang Metro PIS System

Application | SIGM-3250 In-vehicle Box Computer in Nanchang Metro PIS System

In-vehicle Box Computer in Passenger Information System



The subway is an important part of the urban rail transit system. More than 120 million people take the subway to commute every day. To ensure the safety and efficiency of railway systems, a variety of advanced transportation system technologies, such as PIS passenger information system, are being widely deployed.

The subway arrival announcements, the running information displayed on the train, etc., are actually operated by the PIS system. Let's look at this a little more closely to understand the PIS system on the subway.


Ⅰ. What is PIS?

Passenger Information System (PIS) is a system that relies on multimedia network technology and the computer system, providing information services to passengers through the medium of stations and on-board display terminals. The PIS system is able to provide real-time multimedia information such as railway instructions, service time, railway timetable, announcements, news, Live events, and advertisements, meanwhile providing emergency evacuation prompts in situations such as fire, blockage and terrorist attacks.


The PIS system can be divided into the following four subsystems from the structure. Today we mainly talked about the on-board subsystem.


Ⅱ. Application Range

  • Subway On-board PIS system
  • Streetcar On-board PIS system
  • Straddle monorail On-board PIS system


Ⅲ. On-board Passenger Information System (PIS) Introduction

The whole on-board PIS system includes PA public broadcast subsystem, passenger information display subsystem and video monitoring subsystem. The following is an introduction for each subsystem function:


(1) PA public broadcasting subsystem

Operational control center (OCC) and driver intercom: realize the intercom function between the control center and the driver.

Operational control center (OCC) broadcast to the guest room: realize the broadcast function of the control center to the passenger room.

Intercom in the driving room: realize the intercom function between drivers.

Automatic, semi-automatic, manual broadcasting: realize station announcement function, driver-to-passenger room broadcasting function, and emergency broadcasting function.

Broadcast priority control: realize the function of broadcast priority control.

Broadcast monitoring: realize the function of the driver monitoring the broadcast content in the passenger room.

Automatic adjustment of broadcast volume: realize automatic adjustment of the broadcast volume in the passenger room based on the environment.

Video audio playback: realize the video audio playback function.

Passenger emergency alarm and video connection: realize passenger emergency alarm, passenger and driver intercom function.


(2) Passenger information display subsystem

Tour Guide System Monitor: Displays the driving direction, station information, destination information, door and transfer station information, arrival information and time display in the carriage.

LCD network TV: Realize live broadcast, recorded broadcast. And video, time, subtitle, site information can be broadcast synchronously.


(3) Video surveillance subsystem

▲ Passenger emergency alarm display

▲ Operational control center monitoring

▲ Driving room monitoring

▲ Video storage

▲ Passenger room monitoring

▲ Driving record camera

▲ Driving backup camera


Ⅳ. System Architecture

The hardware of the whole system consists of: driving room PIS host, passenger room PIS extension, video monitoring server, broadcast console, pickup + emergency alarm, TGS display, LCD network TV, monitoring touch display, etc.


Ⅴ. System advantages

(1) High-reliability design: Embedded + Linux + vehicle-level system design to ensure the overall reliability and stability of the system.

(2) High redundancy design: bus redundancy, backup audio bus redundancy, PIS host and video server are redundant with each other

(3) Easy maintenance design: modular design, CPCI and EIO standard design, integrated design.

(4) Low power consumption design: embedded platform, fanless design, no noise and low power consumption.

(5) Integrated design: The card-type chassis design, and the functional module is an online replaceable unit, which reduces wiring and makes debugging and maintenance easier.

Distributed design: The controller is distributed, the video surveillance is independent of the PIS host, and a single point of failure will not affect the normal operation of other controllers.


Ⅵ. JHCTECH's Project

Project Name: Passenger Information System (PIS) in Metro Line 3 in Nanchang, Jiangsu

Project time: Oct, 2021

Project site: Nanchang, Jiangsu


Ⅶ. Main Equipment Introduction

In addition to broadcast equipment and display equipment, the on-board PIS system has three main equipment, among which JHCTECH's on-board computer SIGM-3250 is used as a video monitoring server.


1. Video surveillance server SIGM-3250

- SIGM-3250 On-board Box Computer Features -

◆ Aluminum chassis, Fanless & Rugged design

◆ Intel® Skylake/Kabylake-U CPU

◆ 2-Ch DDR4, On-board 4/8GB+SODIMM, up to 16GB

◆ 1*DP, 1*VGA, 1*Smart Display, three displays

◆ 2*LAN, 4*POE(802.3af),5*USB

◆ 2*Iso.COM, 8-bit Iso. DIO, optional 2*CAN

◆ 4*Mini PCIe(opt. 1*mSATA), support GPS/WiFi/4G

◆ EN50155, E-Mark certification, support TPM2.0

◆ Railway power, DC 48/72/110V (±40%) wide voltage power supply


The video surveillance server is the decoding, playback and storage control device of the vehicle surveillance system. The device can receive digital video streams, and perform functions such as viewing, storage, uploading, and management. The device adopts box-type design, fanless design, wide temperature operation, DC 110V power supply, matching 19-inch rack mounting bracket, and can be installed in vehicle cabinets.


2. Driving room PIS host

The equipment is installed in the electrical cabinet of the driver's cab and is the core control equipment of the PIS system. The equipment includes power modules, switches, main control modules, MVB modules, and multimedia modules. The equipment realizes the acquisition of train arrival information and data linkage, the storage of pre-recorded broadcast information, and outputs the control information of the broadcast terminal to realize the connection with TCMS, radio, and fire system. The device adopts CPCI structure, chassis card design, fan-free design.


3. PIS extension in the guest room:

The equipment is installed in the electrical cabinet of the guest room and is the core control equipment of the terminal equipment in the guest room. The equipment includes power modules, switches, control modules, and power amplifier modules. The equipment realizes the broadcast output in the guest room and connects the terminal equipment such as emergency alarm, camera and LCD. The device adopts CPCI structure, chassis card design, fanless design.


In view of the harsh operating environment of rail transit, SIGM-3250 has become ideal hardware to support the PIS system with its features such as ruggedness, high performance, reliability, and will help to facilitate the rapid development of smart rail transport.