Intercepted By An Isdn-based Data Analysis Techniques

Integrated Service Digital Network (ISDN) is a communication network, which is developed on the base of Integrated Digital Network. It can provide pear-to-pear digital connection and can be used to carry many telecom services including voice and non-voice. With the increment of graphic content on the Internet which needs more bandwidth, using ISDN service can greatly improve the capability and the speed of Internet connection. To beat the bad men's illegal activity, find out their activity on the Internet, it is necessary to data capture and analysis the data on the Internet, obtain important information including the pages that they browsed, the mails that they sent and received and the files that they uploaded and downloaded. Based on the implementation of standard ISDN, to meet the specialty of data capturing and analysising, modifying the commonly used protocols on ISDN , this paper discusses the implementation of data capturing and analysising technology based on ISDN.This paper includes:1 ) Analyze the commonly used protocols on ISDNBased on the Opening System Interconnect reference model, the networkcan be divided into 7 layers; Each layer has its special function. To properlytransfer data between these layers , many protocols are used , among which theTCP/IP protocol is the mostly widely used. This paper discusses these commonlyused protocols and their working principle.2) Modify the commonly used protocols on ISDNBecause the standard protocols are commonly designed for duplex communications and the specialty of data capturing and analysising determines that the standard protocols cannot be followed. So, based on the analysis of standard protocol, to meet the need of data capturing and analysising, it is necessary to modify these standard protocols.3) Apply the modified protocols to data capturing and analysisingThe modified protocols can be efficiently used to data capture and analysis. From the result we can see, it is efficient to data capture and analysis the data transferred on the network.