Difference between structured and unstructured networking cable
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Structured cabling specified by the EIA/TIA TR42 committee, is the standardized architecture and component for communication cabling. In a structured cabling system, a series of patch panels and trunks are used to create a structure that allows for hardware ports to be connected to a patch panel at the top of the rack.A structured cabling system provides a flexible cabling plan to address the commonly performed tasks of moving, adding, and changing the infrastructure as the network grows.
Unstructured cabling occurs when optical links are deployed point to point or device to device with no patch panels installed in the link. In this situation, cabling pathways become congested with an entangled mess of two-fiber optical patch cords (Figure 2). Likewise, routing new patch cords in ceiling or floor trays all the way across a data center each time a new device is deployed is extremely inefficient.
Unstructured cabling occurs when optical links are deployed point to point or device to device with no patch panels installed in the link. In this situation, cabling pathways become congested with an entangled mess of two-fiber optical patch cords (Figure 2). Likewise, routing new patch cords in ceiling or floor trays all the way across a data center each time a new device is deployed is extremely inefficient.
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Generally an unstructured network has peers randomly connecting to some subset of all peers. This is nice and simple, but doesn't scale particularly well. The main problem being that you have to search the entire network to find something. There's no way to get directly closer to your answer/destination, that would require structure. The result is more latency and overhead to find a particular pieces of data. So if 25% of all peers have what you are looking for, no problem. But if only 1 of a million peers has what you are looking for it might take awhile.
Structured networks on the other hand are organized to allow for searching efficiently. Ignoring churn, finding a piece of info among a million peers is straight forward. A DHT is a common example of a structured network. Each hop through the DHT gets you an order of magnitude closer to what you are searching for. As a result DHTs scale well into the millions. Churn does have to be delt with, usually by replicating information among many nodes.
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Structured networks on the other hand are organized to allow for searching efficiently. Ignoring churn, finding a piece of info among a million peers is straight forward. A DHT is a common example of a structured network. Each hop through the DHT gets you an order of magnitude closer to what you are searching for. As a result DHTs scale well into the millions. Churn does have to be delt with, usually by replicating information among many nodes.
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