Introduction A recent Cisco VNI Global Mobile Data Traffic Forecast disclosed that in five years there will be 4 billion more mobile-ready devices and connections and an average mobile connection speed will increase by 2.4-fold . The Citrix mobile consumer survey in 2014 revealed that 54% of mobile subscribers would abandon a slow-loading page in less than 10 seconds and 63% of millennials were more likely to blame the mobile network for mobile video stalling . With the advent of smart devices, cloud services, newer technologies for fixed and wireless connectivity and very impatient consumers, there is tremendous pressure to strengthen the access and mobile backhaul segment of the network. The copper connections to the enterprise and towers can no longer suffice the exploding capacity requirements leading to increased fiber penetration. The best way, as already verified by numerous installations worldwide, is to leverage the existing fiber infrastructure such as fiber to the node or cabinet to provide cost-effective interconnection for financial to business enterprises and additionally for small to macro cellular networks . Together with the multiplexing technology the fiber-based network can be made timeless and cheap improving the power and space requirements. The fiber-to-the-x (x: cabinet, antenna, enterprise, etc.), like any other network, is also subject to failures which may arise due to link cuts or equipment malfunctions. Protection planning against such failures and ensuring a high level of network performance is a crucial part of network design, especially for networks where every second of the interruption in the data traffic leads to economic dismay and also exhaustion of valuable resources (time and expert personnel) that would be much appreciated elsewhere. The fronthauling or backhauling network and enterprise access networks can thus benefit from the classical technique of multipath transmission that provides redundant path or backup equipment in the case of failure. In this paper, the vastly implemented classical optical line protection approach is briefly introduced. A novel semi-passive layout especially appropriate for power and latency constrained fixed and wireless application is introduced. The semi-passive approach is illustrated in detail with application scenarios in enterprise and fronthauling architectures.
Download PDF file
Build your own flipbook