TAILIEUCHUNG - Optical Networks: A Practical Perspective - Part 46

Optical Networks: A Practical Perspective - Part 46. This book describes a revolution within a revolution, the opening up of the capacity of the now-familiar optical fiber to carry more messages, handle a wider variety of transmission types, and provide improved reliabilities and ease of use. In many places where fiber has been installed simply as a better form of copper, even the gigabit capacities that result have not proved adequate to keep up with the demand. The inborn human voracity for more and more bandwidth, plus the growing realization that there are other flexibilities to be had by imaginative use of the fiber, have led people. | 420 WDM Network Elements Figure Using an OXC in the network. The OXC sits between the client equipment of the optical layer and the optical layer OLTs. the surrounding OLTs because carriers view crossconnects and OLTs as separate products and often buy OXCs and OLTs from different vendors. An OXC provides several key functions in a large network Service provisioning. An OXC can be used to provision lightpaths in a large network in an automated manner without having to resort to performing manual patch panel connections. This capability becomes important when we deal with large numbers of wavelengths in a node or with a large number of nodes in the network. It also becomes important when the lightpaths in the network need to be reconfigured to respond to traffic changes. The manual operation of sending a person to each office to implement a patch panel connection is expensive and error prone. Remotely configurable OXCs take care of this function. Protection. Protecting lightpaths against fiber cuts and equipment failures in the network is emerging as one of the most important functions expected from a crossconnect. The crossconnect is an intelligent network element that can detect failures in the network and rapidly reroute lightpaths around the failure. Crossconnects enable true mesh networks to be deployed. These networks can provide particularly efficient use of network bandwidth compared to the SONET SDH rings we discussed in Chapter 6. We discuss this topic in detail in Chapter 10. Bit rate transparency. The ability to switch signals with arbitrary bit rates and frame formats is a desirable attribute of OXCs. Performance monitoring test access and fault localization. OXCs provide visibility to the performance parameters of a signal at intermediate nodes. They usually Optical Crossconnects 421 allow test equipment to be hooked up to a dedicated test port where the signals passing through the OXC can be monitored in a non-intrusive manner. Non-intrusive .

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