A Research On Making The Access Gateway Equipment Of NGN From The PSTN Equipment Of Shanghai Bell

The main principle to transform the PSTN equipment of Shanghai Bell into Access Gateway equipment of NGN is based on the rack structure of JRSU, which uses the free ALCN boards in the network and replaces CALC boards with two IPRB boards to connect to SoftSwitch by the FE port provided by the IPRB borads.The transformation makes full use of the sources of boards of network and optimizes the existing network structrue, which plays the specil role in the background of the "Copper back into the light". The transformation to the equipment of Access Gateway can also provide information for the transformation of S1240 local office in futrue. As the company responding to our country's energy saving and emission reduction, the transformation of S1240 local office into LGW to connect the network not only can adjust and optimize the structrue of the network, but it can also reduce the power consumption and save the cost for the company to get more benefit. Therefore, the technology of transformation will provide a good choice for the service provider in the future construction of the network.The essay introduces the background of the technology of transformation of Shanghai Bell PSTN and the transformation proposal. It states the process of the LGW connect to SoftSwitch and analyses some typical problems that may appear. By the project sample in Jieyand, Guangdong, it further analyses the application of the transformation technology. In the last, this essay prospects the development trend of the transformation technology.