Published: 2026-09-11
Recently, the power supply project of the Shanghai Nanhui Branch Line (Lianggang Suburban Railway) reached a key milestone – the section from the Xiayan Road Traction Power Joint‑Use Substation to the Lingang Open Zone Section Substation successfully completed energization and startup, laying a solid power foundation for the subsequent commissioning of equipment across various disciplines.
Systems within the substation – including protection, measurement and control, remote telecontrol communication, and intelligent inspection – impose extremely stringent requirements on the reliability and real‑time performance of the communication network. In the construction of this power supply project, MRD Patriot all‑domestic series industrial switches, equipped with the self‑developed Changzheng software platform, provided reliable support for the power supply system's communication network, achieving full independent control from underlying hardware to core software.
01 Project Background
The Nanhui Branch Line is an important component of Shanghai's suburban railway network, with a total length of approximately 34.86 km – the main line about 27.88 km and the east branch about 6.98 km. The line has 6 stations in total, with a maximum train operating speed of 160 km/h. Starting from the Pudong Hub in the north and running south through the Lingang New Area, the line will become a rapid connection corridor between the Lingang New Area and the Oriental Hub, Hongqiao Hub, and Shanghai's main urban area upon completion.
The power supply system is the "heart" of rail transit, undertaking the dual tasks of delivering electrical energy for train traction and station equipment. Prior to energization and startup, the project team completed key processes to high standards – including high‑voltage cable laying, equipment withstand voltage testing, electrical commissioning, and switch opening/closing tests – and established a multi‑party special working group for coordinated collaboration, ensuring the orderly progress of all work.
02 MRD Involvement
The power supply system imposes extremely stringent requirements on communication network reliability. The substation is located outdoors, and equipment must withstand the alternating challenges of Shanghai's high temperature and humidity in summer and low temperatures in winter over the long term. Inside the substation, high‑power equipment such as frequency converters and high‑voltage switches are densely deployed, generating severe electromagnetic interference. The system requires 24/7 uninterrupted operation – any communication interruption could affect the issuance of dispatch commands and equipment status monitoring. To address these challenges, MRD Patriot all‑domestic series industrial switches provide comprehensive assurance across multiple dimensions:
100% Domestically Produced, Independently Controllable
The product is developed based on domestic core processor chips, domestic switching chips, domestic physical‑layer chips, and a domestic operating system, and is equipped with the self‑developed Changzheng software platform. It achieves full independent control from underlying hardware to upper‑layer applications, with a localization rate of 100%.
Wide‑Temperature Design for Outdoor Conditions
The device supports wide‑temperature operation with a fanless, all‑metal heat dissipation design, readily handling extreme temperature differences between winter and summer in Shanghai, and ensuring long‑term stable operation in outdoor substation scenarios.
Strong EMC Immunity Against On‑Site Interference
With high‑level EMC design, it effectively counteracts strong electromagnetic interference generated by equipment such as frequency converters and high‑voltage switches, ensuring accurate transmission of protection and measurement/control signals and remote telecontrol communication data.
Redundant Power Supplies for Continuous Operation
Supports dual redundant power inputs, with automatic seamless switchover in the event of a single power path failure. Combined with the device's inherent high reliability, this provides solid assurance for 24/7 uninterrupted operation of the power supply system.
03 MRD Related Products
PAT4000‑PHH12GX8C8G
·Core hardware processor, switching chip, physical‑layer chip, and other components all adopt domestic chips, and run on a domestic Linux operating system with independent intellectual property rights
·Supports multiple redundant ring networks and any two ports forming a self‑healing ring, and supports multiple independent self‑healing rings
·Provides packet loss protection mechanism for rapid recovery from network failures
·Supports IGMP snooping and GMRP
·Supports port‑based unicast MAC binding
·Supports multiple multicast protocols and highly secure protection performance
·Supports broadcast storm control, with storm suppression enabled by default
·Supports QoS (IEEE 802.1P/1Q and TOS/DiffServ)
·Supports CLI, Telnet, and Web management methods, as well as SNMPv1/v2c/v3‑based network management software
·Supports RMON
·Supports port mirroring
PAT4000‑PHH4GX24GE
·Backplane bandwidth up to 56 Gbps
·Rust‑proof aluminum alloy housing with Torx screws
·Supports network management
·All ports support wire‑speed forwarding and auto‑negotiation, supporting long‑distance transmission
·Supports configuration file upload and download
·EMC Level 4
·IP40 protection rating
·Compact size for easy installation; plug‑and‑play with no configuration required
·Fanless design, wide‑temperature silent operation
·MTBF ≥ 300,000 hours
MRD continues to deepen its presence in rail transit vertical scenarios, safeguarding the construction and operation of line after line with independently controllable technological solutions and benchmark‑class quality standards. As a leading enterprise in the domestic industrial communication sector, Shanghai MRDCom Co., Ltd. will continue to drive the in‑depth practice of domestic substitution in critical rail transit infrastructure with solid product and solution capabilities.
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