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Wireless Networks Thread, Laser Links in Technical; Dont go giving them ideas...
  1. #16
    ChrisH's Avatar
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    Re: Laser Links

    Dont go giving them ideas

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    Re: Laser Links

    We're in a similar situation. Having a new sports hall built at the moment on the other side of a public road, but must have it linked to the main school network (one of the conditions of the grant that’s funding the build). Was originally going to be a simple WIFI connection, but they want to do streaming media among other things which I don't think a 54Mbit link will cope with very well.

    Had quotes of 10-15K for digging up the road and laying fibre, which is really way more than we can afford.

    Have looked at laser, but there was on-going servicing costs as well as the initial purchase/installation.

    The distance is only around 80-100 metres and there is a clear line of sight.

    Any advice would be of great help.

    Thanks.

    MrLudwig

  3. #18

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    Re: Laser Links

    when you say road, do you mean pubic highway or private school road?

  4. #19

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    Re: Laser Links

    You could cut down the costs considerably by using overhead cabling rather than digging a hole.

    This of course assumes that you have plenty of height, you own the land in between and other overhead wires exist. For instance, if there will be a phone line going to the building suing an overhead wire, why spend £10K burrying your fibre?!? It all depends on what your school policy is.

    Another thought is to see what conduit is being run between buildings - you could steal a bit of space in some

  5. #20

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    Re: Laser Links

    Ric, those were my thoughts, we use overhead, as well as KMs of duct work under the roads with the fibre in them. So shop around though as you may find using your sparks and yourself makes things cheaper. I was quoted by NYCC £800 for networking an external classroom (duct work in place already, and it was CAT5 not fibre) I did it for the cost of the materials and 2 days overtime, came to about £200 including the overtime bill for me and we had some spare CAT5 at the end of it for the next few projects.

  6. #21
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    Re: Laser Links

    You gotta be carefull with over head links and Fiber if its going to get tossed around alot by the wind some breakage may occur. Its worth getting it put in the ground just to see one of those mole machines in action

  7. #22

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    Re: Laser Links

    Or just do like I have done in the past, - spade, pick axe, and some hard digging, makes life far far cheaper, and saves on the need to go to they gym

  8. #23
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    Re: Laser Links

    Quote Originally Posted by john
    Or just do like I have done in the past, - spade, pick axe, and some hard digging, makes life far far cheaper, and saves on the need to go to they gym
    ... or make more productive use of the PE departments detentions?

  9. #24

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    Re: Laser Links

    Quote Originally Posted by ChrisH
    Quote Originally Posted by john
    Or just do like I have done in the past, - spade, pick axe, and some hard digging, makes life far far cheaper, and saves on the need to go to they gym
    ... or make more productive use of the PE departments detentions?
    Rats, I wish I had thought of that one before! But as I did the work in the holidays it would not have been easy to get the kids to do it, but for future jobs I will remember it.

  10. #25
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    Re: Laser Links

    Thanks for the replies.

    It's a public highway, not ours. We did get a cheaper quote for going under the road from a local contractor, but the county council won't let them dig up the road unless the staff they use have some sort of 'road digging up' certificate, which will cost them and thus push up the quote considerably!

    There is a BT conduit under the road, but they won't let us use it. Apparently they did allow others to use their conduits in the past, but had lots of problems with their own cables being damaged so they stopped.

    So the only options I can see are a WIFI link which will almost certainly be too slow, or laser or microwave links which are more expensive and require ongoing specialist servicing (yet more costs).

  11. #26

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    Re: Laser Links

    The way I see it is if a job is worth doing, and clearly this link is going to be used, its worth doing it properly otherwise you will spend your life chasing after it. You could try and tie in the fibre optics with something like future VOIP teleco provisions to the building, CCTV provisions and anything else where the fibre may be used.

  12. #27

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    Re: Laser Links

    Another option might be to get a company in to lay a conduit for you, which would mean that you could get a cheaper networking company to lay the fibre. Just a thought

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    Re: Laser Links

    On the subject of overhead cabling, I used it last year to cable two buildings on the very cheap. We were having a building renovated so we asked the guys to put up the catenary and drill the holes into the building and I run the route inside and connected everything.

    The catenary wire cost me £40 and external grade cat5 was £60 for 305m.

    Had to do it in a rush so there's a few sags which looks pants but I ran 3 wires across and so theres some redundancy.

  14. #29
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    Re: Laser Links

    You would do very well to run it without any kinks, especially with three cables im sure it's fine

  15. #30
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    Re: Laser Links

    What about asking BT to run a fibre for you MrL? - they could run it in thier existing conduit.

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