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Wireless Networks Thread, Performance costs of fibre patching in Technical; I need to run a fibre link from the server room to three cabinets which are not a million miles ...
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    meastaugh1's Avatar
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    Performance costs of fibre patching

    I need to run a fibre link from the server room to three cabinets which are not a million miles apart from each other. To save having to install three fibre runs from the server room, should it theoretically be ok to run an 8 core fibre to cab1, then a four core from cab1 to cab2, then a four core from cab2 to cab3. I would propose just patching them straight through, so no active connections (ie switches) at the connecting cabinets. Any thoughts?

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    Re: Performance costs of fibre patching

    We have a couple of cables set up like that and they work fine. In an ideal world, I would have direct fibres as this would allow for spare capacity for future use but this isn't an ideal world.

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    Re: Performance costs of fibre patching

    Yeah, I've done this once to extend fibre connectivity from an existing link to another cab. But since I'm running in new now, I just wanted to check that this isn't likely to be costly in terms of performance (which I don't think it is). cheers

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    Re: Performance costs of fibre patching

    for each connector you'll loose 0.5db, (less for a splice)
    Can you compromise (and lower the number of connectors to the last cab by running from cab1 direct to cab3,

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    Re: Performance costs of fibre patching

    Yep, probably. Are you able to give me an idea of what level of loss (db) is acceptable. I appreciate that type of fibre/quality is likely to make this difficult to quantify without knowing these factors.

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    Re: Performance costs of fibre patching

    It really depends upon the equipment, probably the switch/module will have a tolerance. We speculated here:
    http://edugeek.net/index.php?name=Fo...wtopic&t=11104

    I reckon about -5 db. ish,

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    meastaugh1's Avatar
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    Re: Performance costs of fibre patching

    ok, thanks for that.

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    Re: Performance costs of fibre patching

    Surely running a 4 core to cab 2 and then a 4 core to cab 3 doesn't offer any redundancy?

    Be better with a 16, 8 , 4 or has been suggested 1 to 2 and 1 to 3.

    We have several cabs looped through like this

    Ben



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