By Wayne D. Grover
Mesh-based survivability bargains many merits, however the study, academic and perational communications groups have to take up new recommendations and concepts approximately community operation; letting the community self-organize its personal logical configuration for instance. Operators additionally have to comprehend, overview and undertake new tools and types for community layout and making plans. This publication is designed to give a contribution to allowing this evolution in the direction of mesh-based survivable networking.
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Additional info for Mesh-Based Survivable Networks Options and Strategies for Optical, MPLS, SONET, and ATM Networking
5 Hubs, Grooming and Backhaul Anyone who has taken a trip by air that required them to take a commuter flight to a major hub airport can relate to the concept of grooming and the related role of a hub node. What the airlines want to do is make sure that their biggest planes fly well-loaded and over the long distances for which they are optimized. It would not be economic, nor provide desired service quality, to have a Boeing 747 land every 100 miles to let a half a dozen people on or off. Aircraft of this calibre are used on long-haul routes between major "hubs" on routes for which a suitable number of passengers sharing the same destination (or next hub) can be grouped together.
A functional block diagram of a B-DCS is shown in Figure 1-10. Figure 1-10. Functional block diagram of a B-DCS. Part 1: Preparations 41 42 Part 1: Preparations The major difference between a DCS and an ADM is the total capacity handled. A typical B-DCS may cross-connect up to 8192 DS-3 / STS-1 (or equivalent) ports in a fully non-blocking manner. A primary use of B-DCS functionality in a mesh-based network is flexible provisioning of transport signal paths. For mesh-based survivable networking, the B-DCS (or its optical cross-connect equivalent) is the primary network element to support mesh restoration or protection schemes.
A tendency is for major advances in switching or routing technology to be coupled with proposed network architectures that would, in our prior analogy, amount to landing the 747 every 100 km to add and drop a few passengers. ATM switches to handle every cell of OC-192s, terabit IP packet switches, and optical packet switching are examples. The general point is that it is fundamentally unnecessary and unadvantageous to ever handle every cell, packet, or call at every core switching node. Any device that can handle every transiting packet or cell, at a node will inevitably require more space, power, complexity, cost and maintenance than a corresponding transport node handling only containers, coupled with a smaller local access node.