Because of the early construction of railway communication system, SDH and PDH equipment are widely used. At the same time, railway communication is different from ordinary Telecom operators. Due to capital and other reasons, equipment evolution is slow. There are still a large number of SDH and PDH equipment in the current network.

     So when expanding the capacity of the system, they have to consider compatibility with legacy old devices of TDM. At the same time, they have to keep up with the pace of history and build a packet-based network. Therefore, it is required to provide the TDM interface on the packet device and compatible with the TDM service.

Railway Communication

    When using ChenXiao equipment to build railway communication system, PTN equipment with rich TDM interface can not only provide manageable, controllable and reliable data network, but also compatible with existing TDM services, providing rich and reliable protection means for legacy TDM services and satisfying customers'TDM experience. Usually for data services, access is directly through eth ports. For the TDM service, it is accessed through E1/T1 and STM interfaces, and the service is protected by dual-homing.

Summary

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