Type of Cabling
i. Coaxial Cable
-carry large number of high speed video transmission
-shield braided wire to block electromagnetic signals enter cable
-carry more data quickly
-more expensive
ii. Fiber Optic Cable
-fastest delivery-transmit signal over much longer distance
-carry data for several television stations or thousands of voice
-send data in one direction
-ideal for environment with large amount of electrical interference
iii. Twisted Pair Cable
(a)Unshielded Twisted Pair (UTP)
-has 4 pairs of wires inside the jacket.
-each pair is twisted with different number of twists per inch to help eliminate interference from adjacent pairs and other electrical devices.
-a disadvantage: may be susceptible to radio and electrical frequency interference.
(b) Shielded Twisted Pair (STP)
-two individual wires wrap in a foil shielding.
-shielding to help provide a more reliable data communication.
-suitable for environment with electrical interference.
- a disadvantage: Extra shielding cause bulky.
Type of Cable Connector
(i) Coaxial Cable Connector
-the most common type of connector used with coaxial cables is the Bayonet-Neil-Concelman (BNC) Connector.
-different types of adapters are available for BNC connectors, including a T-connector, barrel connector, and terminator.
(ii) Fiber Optic Cable Connector
-the most common type of connector used with fiber optic cable is the ST & SC connector.
(iii) UTP Cable Connector
-the standard connector for unshielded twisted pair cabling is an RJ-45 Connector. (RJ=Registered Jack)
-look like a large telephone-style connector.
-a slow allows RJ-45 to be inserted only one way.
Topology and Cable
(i) Linear/Bus → Coaxial, Twisted Pair, Fiber
(ii) Star (concentrator at the middle) → Twisted Pair, Fiber
(iii) Star-Wired Ring → Twisted Pair
(iv) Tree → Coaxial, Twisted Pair, Fiber
Network Hardware/Equipment
Networking hardware includes all computers, peripherals, interface cards, and other equipment needed to perform data-processing and communication within network.
(i) File Server
- very fast computer
- large amount of RAM and storage space
- network operating system software resides on this
(ii) Switch
- same as hubs- contain ports to connect device via networking cable and facilitate communications
- identifies device on network- data intended and sends to that node only
- can connect types of packet switched network segments to form internet work
(iii) Repeater
- electrically amplifies signals it receive and rebroadcasts it
- used when total length of network cable exceeds the standards set for type of cable used
- boost signal with device
(iv) Concentrators / Hubs
- central connection point
- transmit all data received to all node connected to hub
- lots of extra network traffic, network less efficient
(v) Workstation
- user computer that connected to a network
- not necessarily storage capability- files saved on file server
- configured with network interface card, networking software and appropriate cables
(vi) Routers
- direct signal traffic efficiently
- connectors- link different networks
- superintelligent bridge- translate info
- select best path to route message based on destination address and origin
(vii) Bridges
- connect multiple network segments
- connect different types of cabling
- keeps info flowing
- monitor info traffic on both sides of network
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