ZTE PCM solution

The communications networks evolve with the progress of technology and development of social information construction. The weaknesses of legacy PCM equipments become manifest: singular networking mode, few service functionalities and lack of multi-service interfaces. On request by the market for multi-service access, ZTE launched ZXMP P210/230 series products, which are small-sized, serial, integrated and intelligent PCM multiplexing equipment with network management functions, overcoming the deficiencies of legacy PCM in terms of functionality.

Product features and positioning

ZXMP P210/P230, ZTE PCM series, can deliver differentiated solutions on demands:

• ZXMP P210 adopts pure hardware design, enables normal operation & maintenance without NM (NM is optional), applicable to severe environment with unstaffed stations and special industry like military and public security.
• ZXMP P230 integrates digital/analog access, multiplexing, cross connection, transmission and protocol conversion functions. Designed with open bus, it enables 64k~155M service scheduling. Furthermore, P230 takes full advantage of existing line resources to save investment, supports existing service, whilst ensuring future service extension. It is the highly cost effective access solution targeting mainstream access markets.

Typical network applications

• Application in electric utility communications network

Interfaces desired by the electric utility communications network mainly contain low-speed asynchronous data interface, 64K data interface, voice channel and 2/4-line analog channel. Traffic from numerous transformer stations and electric power supply offices flow to the scheduling center, thus forming multi-node service aggregation, and centralized scheduling management is completed.

ZTE PCM equipments ideally fit such requirement. They use E1 as the unified interface at transmission side to provide a wide variety of service interfaces, making it easy for introduction of new services and adapting to burgeoning demands for new services. With digital cross-connect function, ZTE PCM equipments can form star, tree and even hybrid networks.

ZXMP P230 offers flexible configuration, with diversified interfaces available to serve the requirements of electric utility communications:

• FXO, FXS and hotline interfaces for scheduling telephone and office telephone;
• 2/4-line analog interface or E/M interface for automation of early scheduling (Remote Terminal Unit RTU, collector);
• RS232/RS422/RS485 and 64K codirectional interfaces for data transmission of digitalized scheduling system;
• N*64k (V.35 or 10Base-T) interfaces for real-time data transmission of scheduling video, video surveillance and office;
• 2M interface for new integrated automation system.

Reference diagram of electric utility communications network application:

• Applications in intelligent rail transit construction

Rail transit plays a pivotal role in China’s transportation system. Being important in information transmission between operation control center and station, as well as two stations, the transmission sub-system in rail transit is the infrastructure and basis of rail transit communications network, and supplies transmission channels for all intelligent rail communication systems to deliver voice, data and image information. Service types include analog user, 2M digital service, broadband audio broadcast service, various low-speed data services and 10/100Mbit/s Ethernet services.

PCM access equipments can be deployed in various control centers, vehicle sections and stations to address network service demands. PCM access equipments enable access of diversified services, and send them to SDH/MSTP transmission networks via unified transmission interfaces. Network management center set in the control center monitors the PCM equipments in the whole network.

PCM equipments are responsible for access of control information, clock system information, broadcast information, power supply and monitoring information. They can form chain network to transmit broadband audio broadcast and data signals via audio and data shared wire transmission. 3 RS422 interfaces are available to transmit broadcast control and clock transmission and power supply monitoring services between the control center and stations. The control center sends broadband audio broadcast to stations, and each station returns one line of monitoring audio.

PCM equipments take pride in high security and stability, lower-than-Ethernet latency, applicable to transmission sub-system construction in rail transit.

• Applications in military and public security

With pure hardware design, PCM equipments are highly reliable and maintenance-free, suitable for information construction in military. PCM access equipments are deployed in all military posts and their relevant guarantee departments, offering military telephone, local telephone, internal IP broadband network, video conference, surveillance image and digital data applications.

PCM products can be used in dedicated network of public security to deliver triple play services, creating an efficient and maintenance-free public security network.