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Power over Ethernet

Discussion in 'Networks' started by afox3361, May 24, 2005.

  1. afox3361

    afox3361 New Member


    Really stuck on this POE lark, even cisco cant definitively give me an answer! As we all know, CAT5 is limited to 100m before the signal needs boosting. Does a POE injector do this job, thus giving you another 100m? All the specs say is that it will transmit power for 100m from point of injection, but not if it will also transmit the data for a further 100m. Any help you guys can give asap would be fantastic.

  2. AJ

    AJ 01000001 01100100 01101101 01101001 01101110 Administrator

    As far as I was aware, POE is a method for powering things like wireless access points in case they are too far away from a power supply. A repeater would do the job over the CAT 5 distance, as would another switch or hub.

    I now stand to be corrected :oops:
    Certifications: MCSE, MCSA (messaging), ITIL Foundation v3
    WIP: Breathing in and out, but not out and in, that's just wrong
  3. tripwire45
    Honorary Member

    tripwire45 Zettabyte Poster

    POE has nothing to do with extending the range of an Ethernet transmission. As AJ said, it has to do with being able to transmit both data and electrical power to a device in the Cat 5 or 6 cable. This means you don't have to have a separate electrical outlet for the device in question.

    Try this definition on for size:

    Certifications: A+ and Network+
  4. Phoenix
    Honorary Member

    Phoenix 53656e696f7220 4d6f64

    Well a device pumping the power out generally counts as a segmentation device, so would act similar to a repeater/switch in that it would be able to connect two seperate 100m segments

    it wont double the range on a single segment though
    Certifications: MCSE, MCITP, VCP
    WIP: > 0

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