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Wireless QOTD April 7th

Discussion in 'Wireless' started by tripwire45, Apr 7, 2004.

?

The Industrial, Scientific, and Medical (ISM) bands use three specific freqencies. Each one is betw

  1. A. 902.MHz

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  2. B. 2.4 GHz

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  3. C. 5.8 GHz

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  1. tripwire45
    Honorary Member

    tripwire45 Zettabyte Poster

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    Answer later. Post any additional details regarding your answers.
     
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  2. mattwest

    mattwest Megabyte Poster

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    Found some info on this topic, and 2.4 GHZ looks good, but didnt have the time to research it anymore, so still a guess!

    Looking forward to seeing the answer to this one (and learn something new!)
     
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    WIP: Maybe re-certify my CCNA
  3. SimonV

    SimonV Petabyte Poster Administrator

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    Answer B: 2.4 GHz
     
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  4. tripwire45
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    tripwire45 Zettabyte Poster

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    That should read: "Each one is between 26 MHz to 150 MHz wide". Try to look beyond the simple answer and see what else you can find out about all of the frequencies mentioned.
     
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  5. SimonV

    SimonV Petabyte Poster Administrator

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    I did read this when looking for the answer:

     
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  6. tripwire45
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    tripwire45 Zettabyte Poster

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    Good job, Si. Once this QOTD has run it's course, I'll fill in some of the other details.
     
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  7. tripwire45
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    tripwire45 Zettabyte Poster

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    Time's getting short and only two people voted. Only got maybe an hour or so until I "drop the bomb".
     
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  8. flex22

    flex22 Gigabyte Poster

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    2.4 sounds vaguely familiar.I ahve some white papers on wireless, maybe that's where it's I'm thinking from.

    Sorry no explanations I can think of at present.

    Answer: B
     
  9. tripwire45
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    tripwire45 Zettabyte Poster

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    Correct answer is B. It's not a huge shock since both 802.11b and 802.11g operate in that frequency band. The 902 MHz band used to be used for WLAN but was abandoned in favor of higher frequencies. If you still find any 902 (rounded to 900) MHz band WLAN equipment out there, it will cost an arm and a leg to buy. As Si pointed out, that particular band is heavily occupied by cordless phones and a huge variety of other devices.

    The 5.8 GHZ ISM band is often confused with the 5 GHz UNII band. 802.11a uses the 5 GHz UNII band. The 5.8 GHz ISM band is not specified for WLAN usage and since it overlaps the 5 GHz UNII band, it can cause interference on 802.11a systems.
     
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  10. SimonV

    SimonV Petabyte Poster Administrator

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    Another good one there Trip, another bit of wireless technology learnt today.
     
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  11. mattwest

    mattwest Megabyte Poster

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    Very interesting.

    I like these QOTD, keep 'em coming!

    Matt
     
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