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Information Bearer Network Diversifies PIS

4/9/2013 9:31:00 AM

PIS Network Project for Chongqing Metro

Chongqing Rail Transit (Group) Co., Ltd. wanted to build a Passenger Information System (PIS) to improve the quality of service in the metro system, by adopting advanced information and communication technology. Huawei was chosen to undertake the design and implementation of the bearer network for the PIS, which covered the Play Control Center (PCC), PIS node of each metro line and central control station. The newly built bearer network helped the PIS to be a veritable diversified information platform and ensured its reliability and stability.


Chongqing Rail Transit (Group) Co., Ltd., founded in 1992, is a large, state-owned railway operator for passengers. The group is the only corporation that undertakes the urban railway construction and operation, and resources exploitation along all the lines. Furthermore, the group attaches great importance to information system building, hoping to improve the quality of passenger service via advanced information and communications technology.

Key Challenges

The Passenger Information System (PIS) is a multimedia and synthesized information system, which is based on the multimedia network technology and the core computer system. It deploys display terminals in station halls, railway platforms and carriages in order to keep informing passengers of the train schedule and public info in an accurate and timely manner. So it is one of the most important systems in subway operation.

Increasing data traffic volumes

All equipment in the PIS network should meet not only the current needs but also the future demands by adding correspondent modules to satisfy new requirements such as higher bandwidth, more equipment, more applications and more different offices in order to protect the investment made previously.

Security and reliability of PIS

The bearer network should be able to provide network layer security measures, working together with the entire security system of the PIS, to prevent access of unauthorized and external users and avoid operations without permission by operators. Besides, the system required a redundancy design for key equipment and the links, which could avoid the single point of failure and ensure a quick recovery when any fault occurred.


To effectively meet PIS network requirements, Huawei offered a comprehensive solution covering data network, security and storage equipment.

High-speed data processing and forwarding

Considering the fact that PCC needs to process the massive amount of information and applications, Huawei used two S9306 LAN switches as the central switches to ensure high-speed and stable data access for users. Huawei's S9300 series LAN switches are the new-generation and high-end terabit routing switches designed for multi-service convergence.

High-security design to protect PIS effectively

Huawei Unified Service Gateway USG5120 BSR was deployed to achieve high-speed data forwarding and provide security functions such as Reverse Path Forwarding (RPF), which improved network security and avoided various attacks from viruses and Trojans. One Huawei USG5320, serving as the firewall, was also deployed to ensure data access security for internal users. The USG5320 provides functions, as Intrusion Prevention System (IPS) and antivirus technologies, attacks of Distributed Denial of Service (DDoS), Uniform Resource Locator (URL) filtering, and application software restriction.

High reliability network to build a robust PIS system

Huawei deployed high-end S9306s LAN switches at the network core layer and S7703s LAN switches at the aggregation layer. In addition, 1+1 redundancy strategy was adopted for all key equipment to prevent the network failure caused by the single point of failure. Additionally, Huawei's innovative hardware-level OAM+BFD technology was used to achieve quick network failure detection (within 10 ms) and fast end-to-end network switchover (within 50 ms), thus greatly improving network reliability.

Customer Benefits

An integrated and large-capacity information platform

Constructed with Huawei series LAN switches, The PIS network adopts a three-layer network design including core layer, aggregation layer, and access layer. With the powerful performance of these switches, a truly diversified information platform has been built to satisfy the increasing business growth.

Secure and reliable network guarantees the service development step by step

Redundant equipment configures (dual control boards and dual power modules) and redundant network structure (dual-core LAN switches and dual links), with a variety of security policies, guarantee the reliability and diversified development of the PIS. It contributes the setup of a multimedia and integrated information system that focuses primarily on users.