At noc the topology adopted is the mesh topology 32

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At NOC the topology adopted is the mesh topology.3.2TRANSMISSION MEDIA• Wired media• Wireless mediaWired MediaThese are media which require the use of wires, lines and cables to transmitcommunication signals. During my industrial training at NOC, I encounteredmajorly three different types of wired network media namely:Coaxial cableA coaxial cable is an alternative for protecting data from noise. Coaxial cablesdo not produce external electric and magnetic fields and are not affected by
them. This makes them ideally suited, although more expensive, for transmittingsignals.Twisted pair cableIn a twisted pair there are eight copper wire that are coated with differentcolours; the colours are mix/orange, orange, mix/blue, blue, mix/green, green,mix/brown and brown.These colours are very important when terminating cables. The two mostcommon ways of terminating Ethernet cables are:(i)Straight-through method(ii)cross-over method
In straight-through method, in any way you put in your cable, the colouradopted at both ends must be the same.In a cross-over method all you need to do is to terminate one end with a straightrule method and the other end would be that pin ‘1’ goes to pin ‘3’ and vice-versa, the pin ‘2’ then goes to pin ‘6’ and also vice-versa.I got to know that a cross-over cable is used to connect two similar devices likea PC to a PC while a straight through cable is used to connect different devicese.g. a PC to a router.Fibre optic cableAt NOC the backbone upon which the network is built is fibre optic.It is made of glass fibres instead of wire; it consists of a centre glass coresurrounded by several layers of protective material. The outer insulating jacketis made of Teflon or PVC. The fibre optic cables transmit light rather thanelectronic signals, thereby eliminating the problem of electrical interference.
Optical fibres come in two types:• Single-mode fibres• Multi-mode fibresSingle-mode fibres have small cores whileMulti-mode fibres have larger cores. Used for short-distance communicationlinks.Wireless MediaTo fully explore the wireless added dimension, Communication systemdesigners have sought to use wireless media to reduce infrastructure cost andcomplexity, when compared to wired communication systems. There is no needto construct miles of telephone line poles or cable trenches.
During my stay at NOC I was able to interact with the following devices:3.3NETWORK EQUIPMENTSome network equipment:Ethernet RadioIs a device that sends and receive packets from one network to the other.RouterArouteris a device that forwardsdata packetsbetweencomputernetworks, creating an overlayinternetwork. A router is connected to twoor more data lines from different networks. When a data packet comes inone of the lines, the router reads the address information in the packet todetermine its ultimate destination. Then, using information in itsroutingtableorrouting policy, it directs the packet to the next network on itsjourney.
SwitchAnetwork switchis a

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Term
Winter
Professor
NoProfessor
Tags
Computer network, IP address, Network topology, University of Ilorin, SIWES, NOC Manager

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