The distributed data communication equipment is mainly used to simulate the communication net in the real environment.It can not only emulate the transmission process of messages in single equipment

but also emulate the forwarding process of messages among the equipment.The system is based on the Linux operating system

C programming language and Socket programming language.It takes the core control module as the center

and sets up connections among the command shell

simulated devices

and TestCenters by the network protocol.Compared with the traditional simulation system

based on the support from control plane

the proposed system combines the forwarding plane to simulate the forwarding process.Therefore

the system can locate the problem of the data flow timely and solve it immediately.On the other hand

the system can also simulate the TestCenters.As a result

it reduces the cost of the engineering test

and improves the research efficiency.