The paper describes the transmission and treatment techniques of multimedia information on the network,including the cross connection technique of 100 Mpbs Ethernet,LAN emulation of ATM,IP multipoint sending,MBone,st Ⅱ and WDM etc.

Through utilizing modal structure,function integration and method of network controlling,problems such as adding and dropping the signaling from 2 Mbit/s multi-frame,unblocking switching of digital voice channel,real-time monitoring of 2 Mbit/s link,and remote monitoring were resolved,and the functions of cross connection,performance mo.

At the same time it supports the smallest cross connection of DSOs extending the application field.

The capability of cross connection is one of the most important guide line in SDH.

Evaluation of interchange schemes by multi-levels grey system theory;

Study on Evaluation of Planning and Type Selection for Urban Interchange;

The Research of Type Selection and Evaluating System of Interchange;

This article looks back to the development of grade separations in cities of China in the past half of the century, based on which, the existing problems in provision of grade separations are raised for the purpose of guiding the construction thereof to a virtuous circle.

This essay starts with an inquiry into the structural formations in FANF Fangs novels, which are illustrated by the synchronism of the present and history, the network of grade separation and the agreement of the concrete with the abstract.

The traditional grade separation form will cause some problems during the design process due to the terrain condition limitation.