Chapter 4

Transmission Media

Quiz

Please prepare sheet of yellow paper.

Write your name and the date today.

Question #1

What network device that receives a signal and transmits it at a higher level or higher power or onto the other side of an obstruction so that the signal can cover longer distances?

Question #2

? sits between the client application and the real server and intercepts all messages entering and leaving the network and checks if it can fulfill the request itself, if not, then it forwards the request to the real server.

Oypxr vrseer

Unscramble the word in red color to answer this item.

Question #3

What wired transmission cable which consists of multiple, individually insulated wires that are twisted together in pairs?

Question #4

What transmission cable contains a center conductor, made of copper, surrounded by a plastic jacket, with a braided shield over the jacket?

Question #5

What type of network cable that uses a central glass or plastic core surrounded by a plastic coating? It is use to transmit light signals.

Question #6

? refers to the wide bandwidth characteristics of a transmission medium and its ability to transport multiple signals and traffic types simultaneously.

Question #7

What are the two types of Twisted Pair Cables?

Answers

Question #1

What network device that receives a signal and transmits it at a higher level or higher power or onto the other side of an obstruction so that the signal can cover longer distances?

Reapeter

Question #2

? sits between the client application and the real server and intercepts all messages entering and leaving the network and checks if it can fulfill the request itself, if not, then it forwards the request to the real server.

Proxy Server

Unscramble the word in red color to answer this item.

Oypxr vrseer

Question #3

What wired transmission cable which consists of multiple, individually insulated wires that are twisted together in pairs?

Twisted Pair Cable

Question #4

What transmission cable contains a center conductor, made of copper, surrounded by a plastic jacket, with a braided shield over the jacket?

Coaxial Cable

Question #5

What type of network cable that uses a central glass or plastic core surrounded by a plastic coating? It is use to transmit light signals.

Fiber Optic Cable

Question #6

? refers to the wide bandwidth characteristics of a transmission medium and its ability to transport multiple signals and traffic types simultaneously.

Broadband

Question #7

What are the two types of Twisted Pair Cables?

Shielded Twisted Pair (STP)

Unshielded Twisted Pair (UTP)

Chapter 4

TransmissionMedia

TransmissionMedia

TransmissionMediaGuidedUnguided

Physical/Guided

Twisted Pair Cable

Coaxial Cable

Fiber Optic Cable

Twisted-Pair Cable

Generally color coded twisted pairs of insulated copper wires encased in plastic sheath

A thin-diameter copper wire commonly used for telephone and networking cabling.

Twisted-Pair Cable

The two insulated copper wires are twisted around each other to minimize interference (electrical disturbance or noise) from other twisted pairs in the cable.

Twisted-Pair Cable

Charateristics:Relatively inexpensive

Flexible

Easy to install

Easily accomodates different topologies

Generally for analog transmission

Covers limited distance, < 100 meters

Most popular medium for LANs

Twisted-Pair Cable

2 main types:

Unshielded Twisted Pair (UTP)

Shielded Twisted Pair (STP)

Twisted-Pair Cable

Consists of twisted wire pairs that are not only individually insulated, but also surrounded by a shielding made of a metallic substance such as foil.

Sometimes braided copper shielding

Acts as barrier to external Electromagnetic forces

Twisted-Pair Cable

Twisted-Pair Cable

Standard connector

RJ45 male connector

RJ45 female adoptor

Physical/Guided

Twisted Pair Cable

Coaxial Cable

Fiber Optic Cable

Coaxial Cable

Coax for short

Made of wire which carry radio or television signals.

Coaxial Cable

Common in cable television applications.

The cable is designed to carry a high-frquency or broadband signal.

Can carry signals for longer distances than twisted-pair

Less susceptible to electromagnetic interference

Coaxial Cable

Used BNC (Bayone-Neill-Concelman) connector

Named after its Bayonet mount locking mechanism and its inventors: Paul Neill and Carl Concelman

Coaxial Cable

Two types of coaxial cable:

Thin Coaxial Cable

Thick Coaxial Cable

Physical/Guided

Twisted Pair Cable

Coaxial Cable

Fiber Optic Cable

Fiber Optics Cable

A thin glass strand designed for light transmission.

The core consists of dozen or hundreds of thin strands or plastic that use light to transmit signals.

Transmit data up to 2Gbps.

Fibers allow longer distances to be spanned before the signal has to be regenerated by expensive repeaters.

Fiber Optics Cable

Fiber optic cable is very expensive.

It is hard to install and modify and requires highly skilled installers.

Fiber Optics Cable

Following are the fiber optics components:1. core4. coating2. cladding5. strengthening3. cable jacket

TransmissionMediaGuidedUnguided

Unguided

Wireless transmission mediaBroadcast Radio

Cellular Radio

Microwaves

Satellites

Infrared

Assignment

Search for the meaning of the following unguided transmission media. This time include the source where you got the information. Information from Wikipedia will not be accepted.

Broadcast Radio

Cellular Radio

Microwaves

Satellites

Infrared

Due on: Thursday, Feb. 06, 2014

Quiz

Please prepare sheet of yellow paper.

Write your name and the date today.

Question #1

We have two (2) types of transmission media: guided/physical and unguided, to which medium does transmitts data through high frequency radio signals or infrared light beams belong?

Question #2

Broadcast Radio, Cellular Radio, Microwaves, Satellites or Infrared, what wireless transmission media distributes radio signals through the air over long distances which is also known as one-way wireless transmission over radio waves intended to reach a wide audience?

Question #3

AM stands for ?

Question #4

FM stands for ?

Question #5

Satellite is artificial object which has been intentionally placed into orbit. This receives microwave signals, amplifies it and then broadcast it back to earth which then received by the satellite dish. So, what is the natural satellite that orbits the earth?

Answer

Answer #1

We have two (2) types of transmission media: guided/physical and unguided, to which medium does transmitts data through high frequency radio signals or infrared light beams belong?

Unguided / wireless

Question #2

Broadcast Radio, Cellular Radio, Microwaves, Satellites or Infrared, what wireless transmission media distributes radio signals through the air over long distances which is also known as one-way wireless transmission over radio waves intended to reach a wide audience?

Broadcast Radio

Question #3

AM stands for ?

Amplitude Modulation

Question #4

FM stands for ?

Frequency Modulation

Question #5

Satellite is artificial object which has been intentionally placed into orbit. This receives microwave signals, amplifies it and then broadcast it back to earth which then received by the satellite dish. So, what is the natural satellite that orbits the earth?

Moon

Unguided

Broadcast Radio

Cellular Radio

Microwaves

Satellites

Infrared

Broadcast Radio

Distributes the radio signals through the air over long distances

It is used with AM, FM radio, television station, Citizens Band radio

Slower and more susceptable to noise than physical transmission media but it provides flexibility and portability

Broadcast Radio

Radio setup has two parts:Transmitter

Receiver

Unguided

Broadcast Radio

Cellular Radio

Microwaves

Satellites

Infrared

Cellular Radio

Form of broadcast radio used for mobile communication

Transmission speeds range from 9.6Kbps to 2Mbps

Unguided

Broadcast Radio

Cellular Radio

Microwaves

Satellites

Infrared

Unguided

Broadcast Radio

Cellular Radio

Microwaves

Satellites

Infrared

Microwaves

Also called as Fixed-Point Wireless

High frequency radio waves that provide high-speed transmission

Signals are sent from one microwave station to another

Microwaves

Limited to line-of-sight transmission

This means that microwave antennas must be placed in high places

Unguided

Broadcast Radio

Cellular Radio

Microwaves

Satellites

Infrared

Satellites

A space station that accepts microwave signals from an earth base station, amplifies the signals then broadcasts the signals over a wide area

Unguided

Broadcast Radio

Cellular Radio

Microwaves

Satellites

Infrared

Infrared

Sends signals using infrared light waves

Use line-of-sight transmission

Signals only travel for short distances

Remote controls and IrDA devices use infrared light-emitting diodes (LEDs) to emit infrared radiation that is focused by a plastic lens into a narrow beam. The beam is modulated, i.e. switched on and off, to encode the data. The receiver uses a silicon photodiode to convert the infrared radiation to an electric current. It responds only to the rapidly pulsing signal created by the transmitter, and filters out slowly changing infrared radiation from ambient light.