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Wireless Networks Thread, 10Gb connection over fiber in Technical; Just a quick thought for future planning... does a 10Gb connection require different quality fiber cable to a standard 505 ...
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    gshaw's Avatar
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    10Gb connection over fiber

    Just a quick thought for future planning... does a 10Gb connection require different quality fiber cable to a standard 50\125 1Gb connection?

    Seems Cat5e cable can run Gigabit to desktop fine if it's high quality (ours is Krone so should be fine) but then I always think that the backbone should be quicker than what's being served to desk i.e. Gigabit link for 100Mb to desktop so logically 10Gb backbone for 1Gb to desk?

    (Ours at the moment is 50\125 Multimode fiber)

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    you need a high quality of fiber - might be best to get someone into quote (networking specialists) and they should be able to test your current fiber

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    andyrite's Avatar
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    If you are using OM3 fibre you should get 300 metres on 10Gb.

    It should be marked on the fibre which OM it is (1,2 or 3)

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    10GBASE-LX4 will support 10Gbit over existing legacy multimode fiber to a distance of 240 - 300m (dependent on cable type).

    10GBASE-SR will support 10Gbit over existing legacy multimode fiber to a distance of 26-82m. Over OM3 50 μm 2000Mhz fiber (which is recommended for new builds) this increases to 300m.

    [ame=http://en.wikipedia.org/wiki/10_Gigabit_Ethernet]10 Gigabit Ethernet - Wikipedia, the free encyclopedia[/ame]

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    Any idea how far off 100GbE is as I'd quite like to be ready for that when I get my new school built in a few years time?

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    gshaw's Avatar
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    Ah think our stuff is OM2 so might not be able to handle it

    Seems like we're in the middle of a general technology shift at the mo with desktops vs VDI, Gigabit \ 10 Gigabit, virtualisation and so on, seems to need a few more years to settle before the standards become obvious
    Last edited by gshaw; 24th March 2009 at 12:33 PM.

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    Michael's Avatar
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    I always think that the backbone should be quicker than what's being served to desk i.e. Gigabit link for 100Mb to desktop
    I agree with what you're saying, however, you really need to ask whether or not you're currently pushing anywhere near the limits of 1Gbps on your servers, even if you had 1Gbps to the desktop. You could debate that because network traffic would be moving so fast, your overall levels of traffic would drop as they'd be no bottlenecks.

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    Theblacksheep's Avatar
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    and can your core(s) handle multiple 10g links?

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    gshaw's Avatar
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    Quote Originally Posted by Theblacksheep View Post
    and can your core(s) handle multiple 10g links?
    Yup 5400zl can handle it and has some beastly switching capacity

    I think this stuff really kicks in with VDI as that's the route I'm thinking about in future but it's not quite ready yet, probably another generation of desktops away by my guess

    It's all a bit pie in the sky thinking at the moment as we've only just got a decent backbone in for 100Mb to desk and 1Gb between core and edge switches (fixing problems from before, which is a pain as had it been done right we would've been looking to the next step up) but always good think of the possibilities for the future

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    Geoff's Avatar
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    Quote Originally Posted by DAckroyd View Post
    Any idea how far off 100GbE is as I'd quite like to be ready for that when I get my new school built in a few years time?
    Wikipedia to the rescue.

    [ame]http://en.wikipedia.org/wiki/100_gigabit_Ethernet[/ame]

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    Michael's Avatar
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    I wonder what those experts use to test 40Gbps? To my knowledge no single device can push out this amount of data. Other than a major internet link (such as the UK and US) I can't think where else you'd need that sort of speed at the current time

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    nephilim's Avatar
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    Killer gaming network cards can push quite a bit. They reduce Ping quite substancially. For example a ping of 65 was reduced to a ping of 23, a ping of 209 was reduced to a ping of 92, so it reduces the ping by roughly 1/2 - 2/3. Also they can push around 10GB (at the max during benchmark tests) I believe, although that was unstable. Stable they can push about 4GB-5GB give or take.

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    100Gb ethernet, blimey what kind of hardware would you need to saturate that kind of connection, i think in the short term the 10gbase-t stuff looks interesting a couple of companys already offer switch's SMC Networks - SMC8724-10BT TigerSwitchâ„¢ 10G PRODUCTS MANAGED SWITCHES STANDALONE 10G EN_USA and it you have buildings cabled with cat6a or cat7 your laughing.

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    Quote Originally Posted by gshaw View Post
    Yup 5400zl can handle it and has some beastly switching capacity
    12 4X10GB might kill a 5412

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    Quote Originally Posted by DAckroyd View Post
    Any idea how far off 100GbE is as I'd quite like to be ready for that when I get my new school built in a few years time?
    Remember the most likely 40 and 100GB solutions will use parallel fibre technologies, so 40GB is essentially 4 x 10GB lines i.e. 8 cores of fibre, 100GB will use 20 cores, so that 24 core soon gets used up. There are some quite funky new connectors for these parallel fibre technologies, but you can retrofit to existing breakouts as long as the fibre run distances are similar in length (<15% difference). Anyhow just to note that if you really want to plan for those fibre technologies ensure you lay enough cable or make sure the cable conduit is accessible, I'll see if I can did out the roadmaps I had from a recent tech presentation for an idea of ETA.

    Edit: I my jottings I noted that the 3rd Gen of 10GigE (UTP) chips are due in 2010 - that gen of chips will start to appear on motherboards, didn't seem to jot down the roadmap for fibre.

    Regarding cable runs 10G should run to 300m on OM3, 40G and 100G should run to 100m on OM3 cabling and probably ~150m on OM4.
    Last edited by Chillibear; 24th March 2009 at 10:37 PM.

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