Sử dụng ATM để kết nối hệ thống ATM thường được sử dụng để kết nối hệ thống. Có lối thoát hiểm cũng là một số giao thức và các kịch bản ảnh hưởng lẫn nhau giữa các mạng lưới máy ATM. Chương này giới thiệu các tín hiệu hương vị và định tuyến các khái niệm, được triển khai trong mạng lưới ATM hiện đại. Ở nơi đầu tiên, chương bao gồm địa chỉ cũng như các vấn đề tín hiệu chung. Sau đó, nó thể hiện tín hiệu giao thức được sử dụng để thiết lập kết nối qua. | Chapter 5 Using ATM to Connect Systems ATM is commonly used to connect systems. There exits also a number of protocols and scenarios for interworking between ATM networks. This chapter introduces signaling flavors and routing concepts which are deployed in contemporary ATM networks. In the first place the chapter covers addressing as well as general signaling issues. Then it presents signaling protocols that are used to setup connections across UNI and PNNI interfaces. Finally different methods of interworking between ATM networks are discussed. Connecting systems using ATM must involve the use of ATM addressing and signaling. Both elements are important parts on the ATM concept. Addressing actually takes place at two levels at the ATM level using VPI VCI identifiers and at the logical network level. All signaling protocols assign match VPI VCI values to ATM address and physical ATM UNI and or NNI ports. Every physical ATM UNI port must have at least one unique ATM address. Both VCCs and VPCs are unidirectional so signaling protocols must specify traffic parameters separately for each direction of the connections. Note that in addition to signaling operation there is also a need for routing capabilities necessary to find the optimal route for a connection. 79 ATM Basics ATM Address Formats There are two different types of ATM addressing plans. First ATM supports the use of NANP North American Numbering Plan that is based on ITU-T Recommendation. Such addressing format is called or NSAP format. Secondly ATM supports the alternative addressing plan developed by ATM Forum and called ATM End System Addressing AESA . The AESA addresses are used in private and enterprise addresses. AESA also includes support of address format ATM to ensure compatibility with classical public networks such as PSTN and ISDN. Each ATM end station requires a unique ATM address to uniquely identify other end stations. The ATM network also uses unique .
