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What is Unbound or Unguided media?

Updated on January 15, 2010
Media
Media

UNBOUNDED / UN GUIDED MEDIA

Unbounded / Unguided media or wireless media doesn't use any physical connectors between the two devices communicating. Usually the transmission is send through the atmosphere but sometime it can be just across the rule. Wireless media is used when a physical obstruction or distance blocks are used with normal cable media. The three types of wireless media are:

  • RADIO WAVES
  • MICRO WAVES
  • INFRARED WAVES

1. RADIO WAVES:-

It has frequency between 10 K Hz to 1 G Hz. Radio waves has the following types.

  • Short waves
  • VHF (Very High Frequency)
  • UHF (Ultra High Frequency)

SHORT WAVES:-

There are different types of antennas used for radio waves. Radio waves transmission can be divided into following categories.

  • LOW POWER, SINGLE FREQUENCY.
  • HIGH POWER, SINGLE FREQUENCY
  1. LOW POWER , SINGLE FREQUENCY:-

As the name shows this system transmits from one frequency and has low power out. The normal operating ranges on these devices are 20 to 25 meter.

CHARACTERISTICS LOW POWER , SINGLE FREQUENCY:-

  • Low cost
  • Simple installation with pre-configured
  • 1 M bps to 10 M bps capacity
  • High attenuation
  • Low immunity to EMI

2. HIGH POWER, SINGLE FREQUENCY:-

This is similar to low power single frequency. These devices can communicate over greater distances.

CHARACTERISTICS HIGH POWER, SINGLE FREQUENCY:-

  • Moderate cost
  • Easier to install than low power single frequency
  • 1 Mbps to 10 Mbps of capacity
  • Low attenuation for long distances
  • Low immunity to EMI


MICRO WAVES

Micro waves travels at high frequency than radio waves and provide through put as a wireless network media. Micro wave transmission requires the sender to be inside of the receiver.

Following are the types of Micro waves.

  1. · Terrestrial Micro waves
  2. · Satellite Micro waves

1. Terrestrial Micro waves:-

Terrestrial Micro waves are used are used to transmit wireless signals across a few miles. Terrestrial system requires that direct parabolic antennas can be pointed to each other. These systems operate in a low Giga Hertz range.

CHARACTERISTICS of Terrestrial Micro waves:-

  • Moderate to high cost.
  • Moderately difficult installation
  • 1 M bps to 10 M bps capacity
  • Variable attenuation
  • Low immunity to EMI

Satellite Micro waves

The main problem with aero wave communication is the curvature of the earth, mountains & other structure often block the line of side. Due to this reason, many repeats are required for long distance which increases the cost of data transmission between the two points. This problem is recommended by using satellites.

Satellite micro wave transmission is used to transmit signals throughout the world. These system use satellites in orbit about 50,000 Km above the earth. Satellite dishes are used to send the signals to the satellite where it is again send back down to the receiver satellite. These transmissions also use directional parabolic antenna’ with in line of side.

In satellite communication micro wave signals at 6 GHz is transmitted from a transmitter on the earth through the satellite position in space. By the time signal reaches the satellites becomes weaker due to 50,000 Km distance. The satellite amplifies week signals and transmits it back to the earth at the frequency less than 6 GHz.

Characteristics Satellite Micro waves:

  • High cost
  • Extremely difficult and hare installation.
  • Variable attenuation.
  • Low immunity to EMI
  • High security needed because a signal send to satellite is broadcasts through all receivers with in satellite.

Infrared

Infrared frequencies are just below visible light. These high frequencies allow high sped data transmission. This technology is similar to the use of a remote control for a TV. Infrared transmission can be affected by objects obstructing sender or receiver. These transmissions fall into two categories.

  1. Point to point
  2. Broadcast

(i) Point to Point: - Point to point infrared transmission signal directly between two systems. Many lap top system use point to pint transmission. These systems require direct alignment between many devices.

Characteristics of Point to point:-

  • Wide range of cost
  • Moderately easy installation.
  • 100 k bps to 16 Mb of capacity.
  • Variable attenuation.
  • High immunity to EMI

(i) Broadcast: - These infrared transmission use sprayed signal, one broad cast in all directions instead of direct beam. This help to reduce the problems of proper alignment and abstraction. It also allows multiple receiver of signal

Characteristics of Broad Cast:-

  • In expensive.
  • Single installation.
  • 1M bps capacity.
  • Variable attenuation.

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    • profile image

      Soumen 5 months ago

      very very nice. very helpful note with easy word.

    • profile image

      joker 11 months ago

      hahaha

    • profile image

      sheharyar 3 years ago

      thanks ....very nice it helps me,,,,,,,,

    • profile image

      maham 3 years ago

      best ever i seen on net

    • profile image

      SAMEER SINGH MALIK 3 years ago

      very nice.

    • profile image

      golu 4 years ago

      nice discription :-)

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      ramash 4 years ago

      very nice

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      Rimshah shah 4 years ago

      thanx

      very nice info

    • profile image

      sheetal 4 years ago

      thanx

    • profile image

      dip 4 years ago

      it is very easy to understand....thanks

    • profile image

      DnG 4 years ago

      Nice info. given...

    • profile image

      sobia 4 years ago

      well described

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      pallavee 4 years ago

      thanks..for this info..it help my ppt

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      awias 4 years ago

      good

    • profile image

      Andrew Chow 4 years ago

      Thank a lot~

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      MATTHEW 4 years ago

      NICE WORK

    • profile image

      chiranjeev 4 years ago

      jai bhdra kali

    • profile image

      toure moussa 5 years ago

      this topic is really helpful for me to solve my problem with guided and unguided media transmission.

    • profile image

      tanush 5 years ago

      helpful page

    • profile image

      Raj 5 years ago

      Nice answer

    • profile image

      damaris mokono 5 years ago

      The information is good and well detailed

    • profile image

      yash varshney 5 years ago

      please also give information about short distance wireless media

    • profile image

      yash varshney 5 years ago

      please also give information about short distance wireless media

    • profile image

      Ladi A. 5 years ago

      Aside the little errors in spellings, the info provided is just ok(simple, concise, self explanatory ).

    • profile image

      albreezy 5 years ago

      add more

    • profile image

      serviceman x 5 years ago

      interestind add more

    • profile image

      MAJID.GHUMAN 5 years ago

      V NICE!

    • profile image

      Tk 5 years ago

      Apart frm the grammatical errors,i must say it is one helpul information. Thanx 4 it

    • profile image

      machoka magero simion-kibabii campus 5 years ago

      wow!

    • profile image

      aviee 5 years ago

      very easy definitions...........

    • profile image

      VATSAL DANGAYACH: 5 years ago

      SUPERB THINGSSSSSSSSSSSSSSSSSSSSS

    • profile image

      yolanda 5 years ago

      Thanks!!!

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      Jack(777) 5 years ago

      Good Information............

    • profile image

      kashaaf mirza 5 years ago

      helpful material.thnx

    • profile image

      M_Shah 5 years ago

      it's very good info for the paper point view and general knowledge.

    • profile image

      arien 5 years ago

      thanks for this kindness.

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      diya 5 years ago

      it iz realy helpful.thanks

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      maleeha honey 5 years ago

      good information thank u it helps in my assignment

    • profile image

      shona 5 years ago

      meine ise pdra nhi hai but i m damn sure its good for knowledge.thanks

    • profile image

      Mariagoretti onuoha 5 years ago

      Very nice article, it is really great and have helped me a lot.

    • profile image

      zenzo 5 years ago

      good info and GOD bless!!!!!!!!!

    • profile image

      sandy 5 years ago

      very useful information

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      paul 5 years ago

      i like it,am not illiterate now

    • profile image

      hunny sudeep uniyal 5 years ago

      awesm information.thanks to giving us.

    • profile image

      WARDA 5 years ago

      GOOD EXPLAINATION

    • profile image

      rashmi 5 years ago

      very nice!!!

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      monu bansal 5 years ago

      thks a lot.. it hlps me in cmpltng ma assngmnt..

    • profile image

      abdul wakeel 5 years ago

      dear thanks a lot its help me a lot.nice work its simple and informative.God bless u

    • profile image

      Mohammed Nomaan 5 years ago

      good information...

    • profile image

      pawan 6 years ago

      wonderfulll

    • profile image

      Anonymous 6 years ago

      I've rated it as FUNNY cos of the wrong grammar and spellings like "through out", "through put".

      Also it should be one word!! -- Microwaves and Broadcast !!!

      Please fix the grammar and spelling cos it might lead to confusion of some students..!

    • profile image

      mogire kennedy 6 years ago

      infact very interesting

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      prayshi 6 years ago

      Awesome!!!!!!!!!!! the information appear here is really fantastic

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      shen 6 years ago

      nice!!!!!!!!!

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      mskan verma 6 years ago

      thanks for this .it helped in my sessional but there are many mistakes

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      khan 6 years ago

      informative

    • profile image

      ken Grifey 6 years ago

      good info

      thanks a lot

    • profile image

      hk 6 years ago

      very nice

    • profile image

      VYOM 6 years ago

      THANKS FOR THIS INFO IT HELPED ME A lot

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      CKAY 6 years ago

      thank you for your information it has helped us a lot

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      Akshita 7 years ago

      Thanks, it helps me in ma assignment..

    • profile image

      Rashmi Gandre 7 years ago

      Very nice!!!!!!!!!!

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      Cassandra Mantis 7 years ago from UK and Nerujenia

      I love technical hubs, there aren't enough of them! Great info here! Nicely done!