Describes the "Hongqiao technology" of vswitches"

As the first civil airport in Shanghai and one of the three major international airports in mainland China, Shanghai Hongqiao airport has a passenger throughput of up to 30 million passengers per year. However, behind the busy and brilliant work of Hongqiao airport, A program-controlled switching network has been in use for nearly 15 years, and the devices running on the network are close to replacement and elimination periods. The overwhelmed switching network is urgently upgraded under the drive of business.

For the upgrade of the Hongqiao airport exchange network, the new softswitch network needs to be smoothly evolved and replaced on the basis of the original program-controlled exchange network, so that the whole network reconstruction project can be implemented in an orderly manner. Gradually implement the new softswitch system to replace the 18000-line users under the original programmable switching network.

After multi-party comparison and assessment, Shanghai Hongqiao airport finally chose the advanced Softswitch technology recommended by ZTE to build a new set of program-controlled exchange networks to provide richer services, the switching network is "soft.

Approaching soft landing Network

The new and expansion project of the program-controlled switch of Hongqiao Airport is actually a project and system that contains multiple services, that is, the data network is the basic bearer platform, and Softswitch is the core technology, it provides users with a wide range of services, and effectively solves the integration of voice and data services.

The network topology is as follows:

The whole system scheme design highlights the principles of hierarchy, modeling, and high reliability to ensure that the network has a high performance, high security and reliability while having a good forward-looking and sustainable development. ZTE divides the entire system into multiple parts, including the data bearer network system and the NGN voice system. The bearer network is the basis of the NGN system, the NGN voice system is the core application of communication networks. It also covers the business and other supporting system design solutions.

The data Bearer Network of the system. ZTE uses a dual-structure dual-star architecture. Each access device provides a redundant backup link to the core device, and the core device is used as the master and backup devices. Three ZXR10 T1200 telecom-grade high-end routers are used as Core routing devices, two are used for voice services at the access layer, and the other is used as the core router for ADSL data services, provides the egress for the global Internet service to connect to the public IP address of the carrier.

38 ZXR10 access switches are used for AG access in eight data centers and 10 IP address telephone access. Each AG is uplinked with four access switches, two of which are connected to the speech service, one master and one slave. The other two data access switches are connected to the ADSL data service, the IP telephone access switch is directly connected to the core router, which physically isolates the voice service from the ADSL data service at the access layer of the bearer network, ensuring the security and reliability of the voice service.

The NGN voice system adopts a fully-IP-based softswitch network architecture. In this network architecture, the core control layer uses large-capacity Softswitch control devices: ZXSS10 SS1b, and a single set of devices can support a maximum of 6 million users; in this project, each of the two ZXSS1b hardware configurations can support 50 thousand voice users (the hardware itself can actually support 0.1 million AG voice users), and each software license has 16 thousand users;

At the same time, two sets of MSG9000 are configured for the large-capacity relay/signaling gateway (MSG9000 supports a maximum of 0.336 million medium-level connections). The MSG9000 configured in this period supports PRI and 7 signaling, 32 KB and 32 PRI signals are configured, and 64E1 is configured;

For access layer devices used to simulate user and DSL user access, ZTE MSG5200 is adopted. This device can support normal and reverse polarity analog users and broadband access users such as ADLSL2 + and VDSL2, ZTE MSG5200 supports the self-switching function. In case of connection failure between the access layer network element node and the control layer node, the internal communication of voice users is completed independently.

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