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Wireless Networks Thread, This looks interesting in Technical; For those without the cash for PoE take a look at http://www.automatedhome.co.uk/New-P...or-Cables.html Seems pretty obvious really....
  1. #1

    Ric_'s Avatar
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    This looks interesting

    For those without the cash for PoE take a look at http://www.automatedhome.co.uk/New-P...or-Cables.html

    Seems pretty obvious really.

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    FN-GM's Avatar
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    Re: This looks interesting

    Could be useful for certain things, did you find it hard to understand her accent

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    Re: This looks interesting

    PoE is great. We have two Cisco PoE switches in the cisco lab at uni for IP Telephony. You can remotely reboot devices too just by running the shutdown and no shutdown commands, which is great if you've got 8 phones on a test rig and really cba to go round pulling the cables or remembering the button sequence to reboot.

    The only problems with it are that when it comes to gigabit, obviously you cant use it because of gigabit using all of the cables in your cat5e / cat6.

    So, as i was thinking to myself today, PoE could be one of the major affecting factors in the development of the next standard copper network media. For example, they'll need an extra pair for the power. Then on top of that there is the question of future proofing and not just enabling the present. (If you get what i mean). How many more pairs do they put in for future developments or will they try and get gigabit down 3 pairs leaving one for the PoE? Or will they move away from the PoE idea for faster speeds and leave it for 100mbps only or maybe just forget PoE and copper totally??

    These sort of things fascinate me (obviously or i wouldnt be studying network engineering!)

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    Re: This looks interesting

    Quote Originally Posted by Joedetic

    The only problems with it are that when it comes to gigabit, obviously you cant use it because of gigabit using all of the cables in your cat5e / cat6.
    You may need to explain that to the switch manufacturers :-)

    eg Netgear have 24 and 48 port gigabit switches with PoE on all ports: http://www.netgear.co.uk/smartmanage...t_ethernet.php

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    Re: This looks interesting

    Oh I don't bloody know what's going on there lol.

    That's what we were taught on CCNA1 and 2 and are being taught on the IPT course so...meh. Dunno wtf that's all about.

    Is it PoE on the links that are negotiated to be gigabit? or is it PoE on 10 and 100 but when it comes to 1000 you're stuffed....I've never actually come accross a gigabit PoE device before tbh.

    I'd be interested to hear how it works with the gigabit and PoE because as far as I know and am being taught...you can't do it.

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    FN-GM's Avatar
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    Re: This looks interesting

    Joedetic I was told the same as you as well

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    Re: This looks interesting

    Surely it is all done by magic?

    I remember reading the instructions for use of TCP/IP over carrier pigeon ... that actually made sense.

  8. #8

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    Re: This looks interesting

    Quote Originally Posted by GrumbleDook
    I remember reading the instructions for use of TCP/IP over carrier pigeon ... that actually made sense.
    Would that be RFC1149?

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    localzuk's Avatar
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    Re: This looks interesting

    Gigabit ethernet PoE works in roughly the same manner as phantom power on an amplifier to power mic's and electric guitars...

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    Re: This looks interesting

    Oh yes ... second only to RFC1925!!!

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    Re: This looks interesting

    There are a couple of types of PoE - theres the other that uses the spare wires, and i believe you can also piggyback with power over a different frequencey from data... you can also do it yourself!

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    Re: This looks interesting

    I suppose if you modulate your signal over the power that'd be how they do it. Requires a relatively high powered carrier signal i suppose...but, still interesting stuff whether i'm right or not lol

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    Re: This looks interesting


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    Re: This looks interesting

    Quote Originally Posted by Joedetic
    I suppose if you modulate your signal over the power that'd be how they do it. Requires a relatively high powered carrier signal i suppose...but, still interesting stuff whether i'm right or not lol
    As far as I'm aware you can get gigabit midspans that allow you to use PoE and still attain gigabit speeds - not sure if this was just an IEEE task force setup to look into this or an actual product...if someone could shed some light on this ?

    tbh the only real need for gigabit speeds and PoE would be the newer gigabit wireless access points - even then 100mbps is plenty of uplink bandwith for most installations, gigabit IP telehony is not really required even for video telephony applications.

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    Re: This looks interesting

    Quote Originally Posted by GrumbleDook
    Oh yes ... second only to RFC1925!!!
    No matter how hard you push and no matter what the priority, you can't increase the speed of light.
    That reminds me of when our college IT teacher tryed telling me that "they are developing a medium faster than fibre optics"

    No matter how hard i tryed he just wouldnt accept that you cant get faster than the speed of light. What made it more bizarre is that he (sortof)understood the concept of a line being "wider" so that wasnt his mistake.

    My college experiance was a rather wasted time as you may have guessed.

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