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NetworkingSlide3_Wired Transmission


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Thaliah Baker


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[Front]


These describe how data is transmitted between two nodes.
[Back]


Baseband. Broadband.

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NetworkingSlide3_Wired Transmission - Details

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Fibre Optic Connectors egs:
Straight Tip (ST), Local Connector (LC), Square Connector(SC).
Fibre-Optic Characteristics.
Glass or plastic core (distance vs cost) surrounded by glass or plastic cladding, plastic, amour coating, (usually Kevlar) and PVC or Teflon.
Fibre Optic Cables.
Flexible, transparent, strand of glass (silica) or plastic slightly thicker than a human hair. It allows longer distances and higher bandwidths than copper cables. Data is transmitted as DIGITAL.
Two types of fibre-optic cables:
Multi-mode fibre (MMF). Single-mode fibre (SMF).
Carrier sense multiple access with collision detect.
- Nodes listens to wire. - Node transmits data. - If another transmission data, there is collision. - Nodes send a jam signal and wait using the back-off algorithm.
The current Twisted Pair Categories:
Cat 5: 100MHz/2 pairs; 100 mbps (100 base TX). Cat 5e: 100MHz/4 pairs; 1,000 mbps (1000 base T). Cat 6: 250MHz/2pairs; 1,000 mbps (1000 base TX). Cat 6a: 500MHz/4 pairs; 10,000 mbps (10G base T).
Two types of Twisted Pair Cables:
Un-shielded twisted pair.(UTP) Shielded twisted pair.(STP)
Broadband
Broadband Technology transmits multiple data signals/streams/channels simultaneously at the same time.
Baseband
Baseband Technology transmits a singles data signal/stream/channel at a time.
Three main type of network cables:
Coaxial. Twisted pair. (un-shielded and shielded). Fibre optics.
Two types of Coaxial Connectors:
F-Type Connector (75 OHM). BNC Connector (50 OHM).
Characteristics of a Thick Ethernet "Thicknet"
10 base 5. 10 mbps. Baseband. 500m. 1/2" diameter, Radio-Grade 8(RG8). 1024 nodes per segment.
Characteristic of Thin Ethernet "Thinnet".
10 base 2. 10 mbps. Baseband. 185m. 5mm or 2/10" diameter, Radio-Grade 58(RG58). 30 nodes per segment.
The layers of a coaxial cable help to reduce:
Electromagnetic Interference (EMI) and Radio Frequency Interference (RFI).
Three layers surrounding the copper wire of a coaxial cable?
- Plastic Jacket. - Braided shield. - Plastic (PVC or Teflon).
What is/Characteristics of a coaxial cable?
Thick copper wire surrounded by three layers.
Two types of copper wire:
Coaxial. Twisted Pair.
Characteristics of Copper Wire.
Soft, malleable, ductile metal. Very high thermal and electric conductivity. Conductor of heat and electricity. Data transmitted as ANALOG.
Attenuation:
Signal loss caused by degradation of signal over distance.
Radio Frequency Interference (RFI):
Caused by the presence of radio signals.
Electromagnetic Interference (EMI):
Caused by the presence of electrical and/or magnetic signals.
Throughput.
The actual data transfer rate; less than or equal to bandwidth.
Bandwidth.
Maximum data rate transfer possible.