Research and realized on a system of optical network physics layer monitor and switch;

Based on the fundamental principles of SDH bi-directional multiplex section protection ring on 2-fiber,variation of information time-delay for bi-directional multiplex section protection ring switching is deduced and calculated in this article.

This paper presents a common SDH synchronous network synchronization methods, equipment stresses the clock against the common tracking mode, the clock through the automatic protection switching features to increase the reliability of network synchronization, and in accordance with a detailed analysis of the actual case the clock Protection Switching the basic tenets.

On the protection switching of multi-protocol label switching(MPLS);

Protection switching is a key technique in Resilient Packet Ring(RPR).

The main contents of the dissertation include analyze and improvement of bandwidth allocation, fairness algorithm and intelligent protection switching for RPR which are all RPR key technologies; also design and implement RPR MAC Applicated Specific Integrated Ci.

Analysis on impact on the internal force of guard post by waling stripe rearrangement in the foundation pits;

To meet the demand of high reliable transmission of transmission line protective relay signal, this paper presents the solution of the optical fiber circuitous channel and services automatically switching.