Wednesday, October 9, 2019

Single - mode and Multimode fiber / Internet and Networking

Single - mode fiber :-Uses multiple rays of light (modes)  simultaneously,  with each ray of light running at a different reflection angle to carry the transmission over short distances.
         Fiber - optic cable supports up to 1000 stations and can carry the signal up to and beyond 2 kilometers.  Fiber -optic cable are also highly secure from outside interference,  such as radio tranitters,  arc welders,  fluorescent lights,  and other sources of electrical noise.  On the other hand,  finer-optic cable is by far most expensive of these cabling methods,  and a small network is unlikely to need these features.  Depending on local labor rates and building codes,  installing fiber - optic cable can cost as much as $500 per network node.
          Fiber - optic cables can useany types of connectors,  but the Network + exam is concerned only with the two major connector trips : the straight - tip (ST)  connector and the subscriber (SC)  connector.  The ST connector is based on the BNC - style connector but has a fiber - optic cable instead of a copper cable.  The SC connector is square and somewhat similar to an RJ-45 connector.  ( the connector on the left side)  and the SC ( the connector on the right side)  connector types.
Regardless of the connector type,  the fiber - optic cable still functions at the same speed,  which is typically 1000 Mbps and faster.  The only thing that you need to worry about is that the connector matches the device to which it is being connected,  since the two-connector types are not interchangeable.
         When preparing for the Network +exam,  it is sometimes helpful to have a table listing the differences between the different cable types.  Table 1-5 summarizes the different cable types - be sure to review it for the Network +exam.
TabLe 
 Summary of Cable Types

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