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PoL (Power over Link), is a solution for this problem by providing both power and data at 10 times the distance of PoE.
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redundant_pair_2017.01.05.pdf649.86 KB The Redundant Pair protocol allows for redundancy in highly complex network topologies.Attachment Size redundant_pair_2017.01.05.pdf649.86 KB 
Attachment Size link_fault_pass_through_2016.12.28.pdf657.18 KB Find out what Link Fault Pass Through is, and how it is used in today’s networks.Attachment Size link_fault_pass_through_2016.12.28.pdf657.18 KB 
It may need a tremendous amount of network devices to build a complete video surveillance system, together with the complicated cabling networks that connecting all the equipment.